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Types of corrosion

There are different types in which corrosion can occur, recognition of each of these types that can occur, we will reveal the causes that have produced and may take corrective and preventive measures in order to prevent its occurrence.

We can classify the types in which corrosion occurs in the following families:

paint tip General corrosion - This type of corrosion can be seen as the material has on the whole surface looks rough and corroded due to electrochemical reactions that have occurred. Also known as uniform corrosion.

paint tip Localized corrosion –Unlike general corrosion, localized corrosion occurs in areas or surfaces perfectly located where corrosion is concentrated at those sites.

There are 3 types of localized corrosion:

  • Pitting corrosion - Corrosion narrow and deep which perforate the metal.

  • Crevice corrosion - Corrosion wide and deep due to the lack of access of corrosive agent, also known as concentration cells corrosion.

  • Filiform corrosion – Corrosion with wire shape, which occurs in high humidity environments.

Galvanic corrosion - corrosion is produced by contact of two materials with different galvanic potential and in the presence of a corrosive environment.

Stress corrosion-corrosion is presented in combination of agents and corrosive media along with the presence of static or dynamic efforts or stresses which supports the material. Generally recognized by the presence of cracks or fissures in the material.

Flow corrosion - corrosion is presented in combination of agents and corrosive media along with the presence of a fluid flow, that flow produce erosion, impacts and cavitation phenomena on the metal.

Intergranular corrosion - is the corrosion that occurs at the edges or inside of the grains that comprise the metals, it´s necessary metallographic techniques to identify the area and the promoter agent of such corrosion.

Dealloy - is the corrosion that occurs when a metal alloy (mixture of two or more metals) corrodes one metal that composed it.

Friction corrosion - is the corrosion that is caused by the continuous movement between the surface of two metals.

Microbial corrosion – is the corrosion that is causes by the action of some microorganisms.

Corrosion by high temperatures - that is corrosion occurs when the metal is exposed to elevated temperatures, the main difference of this type of corrosion is no longer required the presence of an electrolyte (corrosive medium) to produce the phenomenon of corrosion.

Now that you know the types that corrosion can occur, what measures, actions and methods we can use to stop and prevent corrosion?.

Types of corrosion

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