Different Types of Corrosion

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Corrosion is a natural process that converts a refined metal into a more chemically stable form such as oxide, hydroxide, or sulfide.  Basically, it’s the gradual destruction of metals, which is why we have to keep our valuable metal items protected.  Although some metals are more vulnerable to corrosion than others, it’s important to keep every type of metal product safe.  When it comes to corrosion, there are different types that we have to look out for.  Here are the 4 types of corrosion that your metal could be exposed to.


General Attack Corrosion

This type of corrosion attacks the entire surface of the metal and is caused by chemical or electrochemical reactions.  Although this is the most common type of corrosion and can cause the metal structure to fail, it is often preventable.


Localized Corrosion

Localized corrosion only targets one area of the metal.  There are 3 different types of localized corrosion: pitting, crevice, and filiform corrosion.  Pitting corrosion is when small holes form on the surface of the metal.  Crevice corrosion is when the corrosion occurs in stagnant locations; for instance, under gaskets, washers, and clamps.  Lastly, filiform corrosion occurs under painted or plated surfaces.


Galvanic Corrosion

This happens when two different metals are located together in a corrosive electrolyte, such as salt water.  When this happens, one metal’s molecules are drawn toward the other metal, resulting in corrosion on only one of the metals.


Environmental Cracking

This can result from a number of environmental conditions that affect the metal.  This includes chemical, temperature, and stress-related conditions.


Since corrosion can cause a product to malfunction, it’s important to keep them protected with VCI paper.  This paper is treated with engineered chemicals and then wrapped around the metals to form a protective layer.  At Edco Supply Corporation, we sell VCI paper so that your metal products are kept safe.  For more information, give us a call today.

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