Why not paint over rusty steel?

 

Writer:  Ron Knight (Chemist)

The very simple answer is that it just won’t work.  Understanding why it won’t work is a little more complicated.

Both steel and rust (iron oxide) are compounds of the element iron (Fe).  Steel is made from Fe and a variety of other elements including carbon, manganese and/or nickel. Iron oxide is the result of the reaction of iron and oxygen, therefore, both iron and steel will produce iron oxide when exposed to water and oxygen.

The term “density” refers to the physical weight of a specific volume of material.  Density is usually listed in grams per cubic centimeter.  The density of iron is 7.874, steel is 7.60 and that of rust is 5.242 (all in grams per cubic centimeter).  Please note that steel is less dense than iron and iron oxide is less dense than steel.  Keeping in mind that the volume (container size) remains constant and that all of the elements added to iron are less dense than iron, the new compounds (steel and/or iron oxide) have to be less dense than the iron alone.  The reason that steel in only 3.5% less dense than iron while iron oxide is 45% less dense than steel is that iron oxide is basically steel plus absorbed oxygen and the oxygen has very little weight.

Now comes the tricky part.  In nature absolute confined spaces do not exist so when all of the additional elements are added to a fixed amount of iron the volume of the compound has to increase (rust takes up more than three times the volume of the of the original iron). The result of this increase in volume can have several results.  If the layer of rust is not covered with a coating such as paint, the rust will create flakes of rust and when these flakes get large enough they will fall off (exfoliate) and the result will be a decrease in metal (usually thickness) and the strength of the metal will be reduced.  If the layer of rust is covered with a coating (especially a hard coating) such as paint, the metal will continue to rust and grow in volume.  This continued growth under the coating will cause the coating (paint) to blister and flake off and the corrosion of the metal will continue as before it was painted.  Painting over the rust creates another (and avoidable) problem.  The paint will have to be removed prior to treating the rusty metal surface. The paint will have to be removed by wire brushing and/or particle blasting which will create an added expense of labor for the cleanup and disposal.

Preventing Corrosion: What product(s) to buy

 

Writer:  Ron Knight (Chemist)

Corrosion, rust, oxidation or whatever you want to call it has been around since the beginning of time. If you have been to Georgia, Oklahoma or any of a number of states and have asked yourself why the soil is red? The answer is iron oxides (rust).. Iron oxides occur when iron, oxygen and water combine and the resulting color of this mixture is red/orange.

Since man started to use iron, rust has been and will always be a problem. Over the millennium, man has tried to control rust by the use of corrosion preventative compounds. Some of the earliest attempts were the use of animal fats and coal/oil tars. These attempts worked better than nothing and the reason that they worked was they provided a barrier to keep water away from the metal. Over the years as technology improved these “barrier” products improved. One of the best-known products is Cosmoline. Cosmoline is a mixture of waxy long chain hydrocarbons not too unsimilar to the old “tar” products. While Cosmoline is best known for its use in WW II to protect about anything metal, it is thought that the ancient Egyptians used a product amazing similar in their mummification process.

It has been a long time since WWII and now there are a LOT of products on the market.   New ingredients become available daily. Corrosion preventative products that were “state of the art” a few years ago may not be the best product on the market today. The question is what should I use and the best answer can be found through research. Steps to consider when choosing the best product for your application/situation should include:

Type of metal to be protected

Iron/steel, aluminum, copper etc

Environment

Acid fumes, saltwater spray etc.

Hot/cold, wet (humid)/dry

Temperature extremes

Dusty

How long protection should last

Long term, short term (shipping)

Solvent base desired

Water, oil or solvent

Type of coating/film

Hard, soft, flexible, self-healing

There are some terms that you will find that may be confusing. A lot of products on the market will use the term “water displacing”. Boats displace water. A floating object will displace (push aside) a fluid whose weight is equal to the weight of the floating object. Displacing water does not mean that the water is removed. The term to look for is hydrophobic. There are several definitions for hydrophobic and they include: lacking affinity for water; tending to repel and not absorb water; tending not to dissolve in, mix with or be wetted by water. For corrosion preventative compound to drive off water it must be a hydrophobic.

Look for the specific gravity (S.G.) of a product. Water has a S.G. of 1.0; simply put if something has a S.G. less than 1.0 it will float and if it has a S.G. greater than 1.0 it will sink. The vast majority of products that are on the market have a specific gravity 0.8/0.9; there are even some products that have a S.G. less than 0.7. Question—how does the product get under and drive off water if it floats on water? Try to find a product that sinks under existing water (has a S.G. greater than 1.0).

When you find a product or are currently using a product, go online and get the MSDS for the product. The MSDS will give you the S.G. and it will also list some of the ingredients. Following the name of the ingredients there will be a CAS number. If you “Google” CAS number xxxxx-xx-x, it will give you the specifications of that CAS number. See what ingredients are in the product. There are products that say they are (or contain) lubricants but no lubricants are listed on the ingredient sheets. One product has a lubricant listed but the product is essentially wheel bearing grease and mineral spirits. This may have been acceptable in the past but not today.

One year I made four presentations on corrosion preventative compounds. Some of the people in attendance were at all four presentations and ask the same questions. The real answer to selecting a product that will work the best for your situation is: do the research; buy the product AND USE IT!! Nothing works if you leave it in the can.

Next time: A discussion on contact angles of liquids

The Oxidation of Aluminum

Writer:  Ron Knight (Chemist)

Aluminum being the most abundant metal in the earth’s crust (at 8.2% of the total metals) is never found free in nature. Aluminum is reactive and will react spontaneously with water and/or air to form aluminum oxide. Aluminum oxide, Al2O3, forms a stable passive layer that protects aluminum from corrosion or further oxidation. This layer is about 4 nm thick and will provide corrosion protection as long as this oxide layer is stable.

Aluminum is an amphoteric metal and can react with an acid as well as a base. The protective layer of aluminum oxide will deteriorate in environments with high or low pH or even in environments where aggressive ions are present. The result is that the oxide layer is only stable in a pH range of 7.0 to 9.0. Below 7 or above 9 the rate of corrosion increases at an increasing rate.
Among the most aggressive of ions is chlorine. When the layer of aluminum oxide comes in contact with the chlorine, it becomes unstable and a reaction develops, releasing hydrogen gas and producing dialuminum hexachloride. The AlCl3 hydrolyses in water and forms an acid mist that breaks down the protective layer. The most typical results are: formation of corrosion pits, crevice corrosion, inter-granular corrosion and galvanic corrosion. As this process continues the corrosion creates stress raisers and ultimately stress cracks and metal fatigue and failure.

Corrosion Zero-AL is a water-based product formulated by Corrosion Protection & Solutions. Corrosion Zero-AL protects aluminum two ways. Its corrosion preventative compounds stabilize the aluminum oxide making it less reactive and at the same time depositing a polymer barrier to protect the metal surface from outside contaminates including air and water. This film is dry to the touch and will not trap dust and blowing dirt. It can be applied by brushing, rolling or dipping and there is no special equipment or skills required to apply Corrosion Zero-AL.

Corrosion Control

Writer:  Ron Knight (Chemist)

Control is best word to use.  Corrosion is the natural process that returns materials back to their natural state.  With the exception of gold, metals such as aluminum, steel (and its various alloys), copper do not naturally exist in a usable form.  Man has learned how to process various ores and oxides into a form that they desire.  Corrosion or sometimes oxidation is simply the reversal of these processes and in time “refined” metals will return to their natural unprocessed state.

Corrosion Protection & Solutions business model is to determine the cause of what we call corrosion and develop a product and/or process to greatly slow down the natural process.  We do not believe that “one size fits all” so by careful examination and experience, we tailor a specific solution to specific corrosion problems.  Over the years we have been ask to find a solution for a problem that we had already solved.  The result is that we have a “basket” of solutions/products so we do not have to reinvent the wheel with every inquiry.   We have products that, as far as I know, are unique to us.

In our basket of products you will find products that convert iron oxides (rust) to an inert compound, thereby, elimination the existing rust.  You will find products that work only on copper, only on aluminum on steel and/or iron.  We make all of the products in bulk and when the products are needed in the aerosol form, we send the bulk product to a contract packaging company where they put in aerosol cans.  Our products can be applied by brushing, dipping, spraying or even by wipes.  We make/provide lubricants, corrosion preventative compounds (cpc) and even lubricants containing cps’s.  We make products using solvents as a base or water as a base and even products that are applied without being diluted.  One thing that makes CP&S unique is that we do NOT make flammable products.  When we formulate our products we take into consideration the:  environment, specific gravity, molecular size and how long the protection needs to last.  See the videos on our Corrosion Zero page for more evidence.

Corrosion Protection for Lead Acid Battery Systems – a new solution for a 154-year-old problem

Writer:  Ron Knight (Chemist)

Objective:

To provide long-term corrosion protection for the external metal parts of the rechargeable lead acid battery electrical system.  The external battery case contains a number of cells, each containing electrodes of lead and lead oxide with sulfuric acid as the electrolyte.  (The internal corrosion known as a softening and shedding of lead off the plates cannot be avoided because the shedding is a natural phenomenon caused by the reaction of the electrodes with the sulfuric acid.)

Background:

The lead acid battery is the oldest but is still the most widely used rechargeable electric storage device.  The lead acid battery was invented in 1859 by Gaston Plante and remained unchanged until Camile Alphonse Faure improved it in 1881.  The next notable improvement came in the 1970’s with the introduction of the valve regulated (sealed) gel electrolyte battery.  The lead acid battery is simple, relatively inexpensive and portable but the other metallic parts of the system are subject to corrosion due to the chemical reaction of those parts with the acid, acid vapors and hydrogen that are produced during the recharging process.

System Ingredients/Materials

In addition to the lead, lead oxide, sulfuric acid and battery case that make-up the actual battery most if not all of the following are found in the recharging system:  copper, aluminum, zinc, a variety of connector plating materials and steel.

Identifying the Problem

Upon inspection of the recharge system, it is probable that the effects of corrosion will be present.  Aluminum connectors corrode to aluminum sulfate, which is a white crystalline/granule; zinc corrodes to a white powder and copper corrodes  leaving blue/white crystals.  Copper and Iron reacts to produce iron sulfate (a green or blue greenpowder) and/or a brown-yellow coating, which is ferric sulfate.  If a white powder is found on the lead positive battery terminal, it is because the terminal is a lead/zinc alloy.  The above sulfates are a result of :  over-filling the battery with either water or electrolyte (thermal expansion of the liquid will force some of the liquid out of the battery vents onto the top of the battery causing a chemical reaction with the other materials); the electrolyte can weep from the plastic-to-lead seal in the battery case; if the battery is overcharged, sulfuric acid fumes will vaporize through the vent caps and react with the other metals.

Understanding the Problem

All atoms are comprised of a nucleus and 1 (in the case of hydrogen) or more electrons orbiting the nucleus and the total number of electrons in an atom constitute the elements’ atomic number.  There are one or more “levels” of orbits and these are called valence shells and each shell has a maximum number of electrons that can occupy a given shell. The number of valence electrons of an element determines its periodic table grouping.  There are 18 groups (vertical columns) and groups 3-12 are classified as “transition metals”.  It can be stated that a transition metal is an element whose atom has an incomplete valence shell(s) in its atomic structure” and the number of electrons in an atom’s outermost valence shell governs its bonding behavior.  An atom with only one or two valence electrons in its outer-most shell is highly reactive, because the extra electrons are easily removed to form a positive ion.  Iron (atomic number 26), Copper (atomic number 29) and Zinc (atomic number 30) are all highly reactive transition metals.  Aluminum (atomic number 13) is in group 13 has 3 electrons in its outer shell is still reactive but not as reactive as the other three elements.  Pure lead is considered a stable element but the addition of zinc makes the lead battery terminal less stable.  Equilibrium is the natural state of matter.  In order to gain equilibrium elements attach (bond) with each other until the outermost valence shell is complete (i.e. a closed shell).  That is why the most active elements (such as sodium) are never found in its “pure” state.

Chemical reactions in which atoms are lost or gain are called “redox” reactions.  These reactions can be simple or complex but in all cases involve the transfer of electrons.  If electrons are lost the oxidation number increases and  it is called an oxidation process.  If electrons are gained, the oxidation number decreases and it is a reduction process.  A visual way of determining the type of reaction is by the color of the resulting material.  Red is associated with oxidizing conditions while green and white are typically associated with reducing conditions.

The reaction of sulfuric acid on metal depends on a number of factors:  the metal, the concentration of the acid and temperature.  Dilute sulfuric acid (like that found in lead-acid batteries) will react with any metal by displacing hydrogen from the acid.  The result

is H2 + the sulfate of the metal (as noted above with the various colored powders and crystals).

Metal + H2SO4  yields  H2 + Metal sulfide

The understanding of the problem is that most elements are not found in nature in the “pure” state.  Over time the elements bond with other elements and/or compounds to achieve the natural state of equilibrium.  Through a variety of manufacturing process man has taken these compounds out of equilibrium and into an unnatural pure unstable state.

As reasons and causes for corrosion were understood, it was found that there were a number of causes and forms of corrosion.  The end result is the same but the causes were much more complex than previously thought.  The forms of corrosion now include:

Forms of Corrosion

Uniform

Galvanic

Concentration Cell

Pitting

Crevice

Filiform

Intergranular

Stress

Corrosion Fatigue

Fretting

Erosion

Dealloying

Hydrogen damage

Corrosion in Concrete

Microbial

To make matters even worse, most of the time corrosion is caused by several of the above with the ultimate result being failure of the part or piece of equipment.

Historical Solutions

The discovery of iron predates 5000 BC and the oxidation of iron, commonly called rusting, has been a problem since man first used iron (even the bible mentions rust 8 times, Matthew 6:19-21 says that “rust destroys—“).  Throughout time a variety of solutions have been tried.  Iron items have been made thicker and heavier so they would last longer.  At some point someone noticed that water had an adverse effect on iron so a light oil was used to help keep moisture away from the iron.  It was found that animal fat (lard) was more effective than oil because it could be put on thicker and last longer.  In the early to mid 20th century cosmoline was applied as a rust preventive.  cosmoline is a mixture of oily and waxy long-chain non-polar hydrocarbons and proved to be an effective coating for equipment on long sea voyages during WWII.  The problem with cosmoline was that once the volatile hydrocarbons evaporated, the solid wax that was deposited was extremely difficult to remove.

In the early to mid 1950’s new improved versions of cosmoline type products were introduced as corrosion preventative compounds (CPC’s).  The generic name for the major ingredient is “slack wax”.  Slack wax is a soft, oily crude wax obtained from the pressing of petroleum paraffin distillate or wax distillate containing 2-35% oil.  Slack wax is easier to remove than cosmoline but it still is a preventative barrier helping to keep oxygen and water from the treated area.  Neither cosmoline nor slack wax products remove or drive-off moisture that is already on or in the treatment area.  They trap the moisture under the coating allowing the trapped moisture to start/continue the corrosion process.  Another concern for the slack wax type of products is that as the waxy barrier heats up, they soften and can sag because they remain in place by gravity or by the slight vacuum (similar to what holds paint on a wall) that occurs when it is applied.  Any sagging or drooping can create a gap allowing moisture and other contaminates into the protected area.

Probably the first time that corrosion prevention compounds were looked at closely was in 1987 when a flameout of an Air Force F-16 nearly resulted in a crash.  It was found that the flameout was due to corrosion in the aircraft’s fuel control valve.  The Department of Defense contracted with Battelle of Columbus, Ohio to find out exactly why the fuel control valve was malfunctioning and to provide a solution.  Battelle worked with Bell Labs and the AFRL to identify the problem.  In August 1996 Battelle submitted their final report for this contract.  Battelle’s findings were that the failure was due to fretting corrosion on the tin plated pins in the main fuel shutoff valve.  Battelle preformed extensive testing on 12 lubricants/corrosion preventative compounds and found 10 of the CPC’s failed (six of the formulations were found to actually accelerate corrosion) and two of the products passed.  One of the products that passed was Super Corr (now known as Super Corr A) and it assigned to military specification MIL-L-87177A.  Super Corr and the other product were then subjected to extensive flight tests on F-16 aircraft.  The final report on phase two testing was submitted by Battelle in March 1999.  The summary of the report was that 150 aircraft at 9 bases were involved in the study and that “gold-plated connectors without any protection can corrode rapidly and that the best lubricants/corrosion preventative compounds can totally inhibit corrosion.  It was also determined that the money spent on the lubricants/corrosion preventative compounds equates to $1000 in savings for each $1.00 spent on corrosion preventative compounds.

Changing Technology

As time passes both the understanding of the causes of corrosion and the materials/ingredients available to combat corrosion improve.  Because of environmental concerns the carrier solvent in Super Corr has been changed twice (for a total of 3 different solvents) and each time Battelle tested and re-approved Super Corr.  Each time Battelle not only tested the newest version against other corrosion preventative compounds, they tested it against previous versions of Super Corr. In the most recent testing (completed October 2010) the newest version of Super Corr A outperformed the previous version, which had outperformed the original version.

Providing the most effective CPC possible is a constantly changing process.  The current solvent was chosen from 20 different solvents. The original ingredient for extended salt spray performance has been replaced with a newer ingredient that is 2.5 times as effective against salt.  Neither the solvent(s) nor the new corrosion preventative compound was available in earlier versions of Super Corr.  Science and technology allows us to outperform even the earlier versions of Super Corr.

21st Century Solutions for Lead Acid Recharging Systems

The development of Corrosion Zero is based on the past experiences and lessons learned from the ongoing improvement of Super Corr A.  For example:  Because of need to prevent fretting corrosion in vibrating in “mobile” recharging systems and closer manufacturing tolerances (in electrical connectors), the lubricant used in Corrosion Zero is from the same family as the lubricant in Super Corr a but is 40% of the molecular size.  Because of new availability, the ingredient to protect against salt (the newer ingredient in Super Corr A) has been replaced with an ingredient that is 5 times as effective as the one in Super Corr A.  The solvent in Corrosion Zero was selected because it is also non-flammable, is a heavy hydrophobic to displace water and is a very good cleaner/degreaser.  These are the minor changes.  The most noticeable change from past CPC’s is that because we now have a much better understanding of the problems associated with the chemically active electrical charging systems components, we have included ingredients that bond with the “outer shell active electrons” thus making the core electrons more chemically inert (non-reactive).  The final addition to Corrosion Zero is a newer ingredient that has proven to be very effective against acid vapors.

Corrosion Zero is an engineered product that addresses and solves all currently known problems with lead-acid batteries and the recharging system components.

Corrosion Protection and Solutions in 2013

Combating corrosion is a dynamic and ongoing process.  Products that were best available yesterday may not be the best available tomorrow.  Realizing “one size” does not fit all, CP&S is constantly looking for new and better ingredients to improve and develop current and future products.  Microbial influenced corrosion has recently been recognized as a problem on aircraft.  Since last July, Battelle has been testing a version of Super Corr A containing a biocide that will stop or at least slow down the corrosion effects due to the presence of microbes on aircraft.  The results look very promising.  A private company has ongoing testing on a new CP&S product that is showing to be very effective on copper in a hydrogen sulfide environment.  The research has been funded to test a new CPC for aluminum in both solvent and water bases.  In the 4th quarter of 2012, CP&S started work on a line of corrosion preventive compounds that will contain nanotubes and also a line of products that will purposely vaporize with the vapors filling and protecting otherwise unreachable voids.  Samples of both of the new product lines will be available for testing in 2013.

Forms of Corrosion

Writer:  Ron Knight (Chemist)

Concentration cell corrosion occurs when two or more areas of a metal surface are in contact with different concentrations of the same solution. There are three general types of concentration cells:

Metal ion concentration cells

In the presence of water, a high concentration of metal ions will exist under faying surfaces and a low concentration of metal ions will exist adjacent to the crevice created by the faying surfaces. An electrical potential will exist between the two points. The area of the metal in contact with the high concentration of metal ions will be cathodic and will be protected, and the area of metal in contact with the low metal ion concentration will be anodic and corroded.

Oxygen concentration cells

Water in contact with the metal surface will normally contain dissolved oxygen. An oxygen cell can develop at any point where the oxygen in the air is not allowed to diffuse uniformly into the solution, thereby creating a difference in oxygen concentration between two points. Corrosion will occur at the area of low-oxygen concentration which are anodic.

Active-passive cells

For metals that depend on a tightly adhering passive film (usually an oxide) for corrosion protection, salt that deposits on the metal surface in the presence of water, in areas where the passive film is broken, the active metal beneath the film will be exposed to corrosive attack. An electrical potential will develop between the large area of the cathode (passive film) and the small area of the anode (active metal). Rapid pitting of the active metal will result.

Corrosion fatigue

is fatigue in a corrosive environment. It is the mechanical degradation of a material under the joint action of corrosion and cyclic loading. The phenomenon should not be confused with stress corrosion cracking, where corrosion (such as pitting) leads to the development of brittle cracks, growth and failure. The only requirement for corrosion fatigue is that the sample be under tensile stress.

Corrosion in Concrete:

Concrete corrosion is the chemical, colloidal or physicochemical deterioration and disintegration of solid concrete components and structures, due to attack by reactive liquids and gases.

Crevice Corrosion:

Crevice corrosion refers to corrosion occurring in confined spaces to which the access of the working fluid from the environment is limited. These spaces are generally called crevices. Examples of crevices are gaps and contact areas between parts, under gaskets or seals, inside cracks and seams, spaces filled with deposits and under sludge piles.

Filiform Corrosion:

This is a type of corrosion that is commonly known as “localized” and is normally linked to magnesium and aluminum alloys that utilize an organic form of coating. However, it can also occur on other coated metals such as steel, iron and zinc.

Fretting Corrosion:

Fretting refers to wear and sometimes corrosion damage at the asperities of contact surfaces. This damage is induced under load and in the presence of repeated relative surface motion, as induced for example by vibration. The ASM Handbook on Fatigue and Fracture defines fretting as: “A special wear process that occurs at the contact area between two materials under load and subject to minute relative motion by vibration or some other force.

Integranular Corrosion

Intergranular corrosion (IGC), also known as intergranular attack (IGA), is a form of corrosion where the boundaries of crystallites of the material are more susceptible to corrosion than their insides.

Pitting Corrosion:

Pitting corrosion, or pitting, is a form of extremely localized corrosion that leads to the creation of small holes in the metal. The driving power for pitting corrosion is the depassivation of a small area, which becomes anodic while an unknown but potentially vast area becomes cathodic, leading to very localized galvanic corrosion. The corrosion penetrates the mass of the metal, with limited diffusion of ions.

Stress Corrosion Cracking:

Stress corrosion cracking (SCC) is the growth of crack formation in a corrosive environment. It can lead to unexpected sudden failure of normally ductile metals subjected to a tensile stress, especially at elevated temperature in the case of metals.

Uniform corrosion:

Uniform corrosion is characterized by corrosive attack proceeding evenly over the entire surface area, or a large fraction of the total area. General thinning takes place until failure.

Let Corrosion Zero burst your bubble

Writer:  Ron Knight (Chemist)

The hydrophobic effect represents the tendency of water to exclude non-polar molecules.

In a hydrophobic interaction the polar molecules actually reject non-polar molecules in favor of bonding to themselves.  Water actually forms solvation shells around the non-polar molecules, thereby, reducing the mobility of the water molecules.  (This reduction leads to losses in both the translational and rotational entropy of the water molecules reducing the free energy of the system.)  The now encapsulated hydrophobic molecules then tend to “move together” because of the thermodynamic effect of large numbers of like (solvent) molecules are energetically more favorable than smaller numbers (of water molecules).  (This effect is common in the separation of water and oil into layers of different specific gravities.)

The solvent(s) used in Corrosion Zero are non-polar, electrically neutral with a high specific gravity, a small molecular size and low vapor pressure.  At this point this means that the now encapsulated (and heavy) molecules sink and form a layer under the water, ultimately forming a thin layer separating the water molecules from the material under the solvent layer.

Surface tension –water molecules are non linear and the oxygen atom has a higher electro negativity than the two hydrogen atoms.  The result is that water is a polar molecule with an electrical dipole moment allowing the water to form up to 4 hydrogen bonds.  These factors lead to very strong attractive forces between molecules of water, which cause water molecules to have a high surface tension.  Because of a high surface tension, water tends to have the smallest (actual) surface as possible in order to achieve the lowest possible energetic state. The resulting structure is a sphere.  Once the water molecules are suspended on a thin layer of solvent instead of the material surface. The water molecules are able to fill all possible hydrogen bonds.  The solvent molecules, instead of the surface of the treated areas, now support these spheres of water.

We have shown how Corrosion Zero displaces (drives off) existing water.  We now need to prevent re-accumulation of water on the treated surface(s)

Corrosion Zero is a solvent-based lubricant containing compounds that prevent corrosion.  It is these ingredients deposited by the vaporizing solvent that must lubricate, prevent corrosion AND prevent water from re-accumulating.  The ingredients selected to be dissolved in the Corrosion Zero solvent are lipids.  Lipids are a large and diverse group of compounds that are related by their solubility in non-polar solvents and are generally insoluble in water.  Although there is a great structural variety among the lipids, they are hydrophobic and form a protective film (a lipid bilayer) on the treated area.  Even though lipid bilayers are only a few nanometers thick they are impermeable to most water-soluble molecules.  The resulting film shields the treated material from moisture as well as other undesirable effects caused by the surrounding environment.  Unlike rigid coatings, the Corrosion Zero  film remains flexible and will not crack when the treated material is subject to vibration and/or thermal expansion or contraction.  It is the flexibility of the film that makes Corrosion Zero extremely effective against fretting corrosion.   Also, because the film is not rigid, the film tends to be “self healing” and will fill scratches that are caused by the mating and/or unmating of close tolerance parts.

Because Corrosion Zero is so easy to use and no special equipment or skills are required to apply it, one tends to think that it is a “simple” product when, if fact, it is the complex combination of very specific ingredients that makes Corrosion Zero the unique product that it is.