TYPES OF CORROSION

What are the types of corrosion?

Stress corrosion cracking

(SCC) is the cracking induced from the combined influence of tensile stress and a corrosive environment. The impact of SCC on a material usually falls between dry cracking and the fatigue threshold of that material.

Uniform corrosion

is a type of general corrosion that occurs evenly across the entire surface of a metal or alloy. At first glance, the corrosion mechanism can cause an unwanted appearance, leading to the gradual loss of material and potential weakening of the material structure.

Pitting corrosion

is a localized form of corrosion by which cavities or "holes" are produced in the material. Pitting is considered to be more dangerous than uniform corrosion damage because it is more difficult to detect, predict and design against. Corrosion products often cover the pits.

Graphitic corrosion

refers to the deterioration of grey cast iron pipes, in which the metallic constituents are leached or turned into corrosion products, leaving the graphite intact and exposed.

Microbial corrosion

is the general process in which the presence of biological organisms or microorganisms brings about corrosion. You might also find microbial corrosion referred to as: Bacterial corrosion.

Galvanic corrosion

(also called ' dissimilar metal corrosion' or wrongly 'electrolysis') refers to corrosion damage induced when two dissimilar materials are coupled in a corrosive electrolyte. It occurs when two (or more) dissimilar metals are brought into electrical contact under water.

Crevice corrosion

is a direct result of impeded mass transport at an occluded site on a material surface. Convection between the solution trapped within the occluded area and the bulk medium is slow, so the dissolved oxygen in the occluded region is rapidly consumed.

High-temperature corrosion

is a form of corrosion that does not require the presence of a liquid electrolyte

Molten salts, or molten metals, typically at temperatures above 400°C (750oF.