Different Types of Corrosion




Corrosion is the process of deterioration of metal caused by the action of chemicals or electro-chemicals present in the surrounding atmosphere. It is the major concern of construction industry where various metals are used for structural purposes.

There are many types of corrosion occur in metals.

Atmospheric Corrosion

Atmospheric corrosion is a type of wet corrosion caused by the action of electrolytes. In this case, moisture present in the atmosphere, rainwater, etc. acts as electrolytes triggering corrosion of the exposed metal surface.

Erosion Corrosion

Erosion corrosion is caused by mechanical abrasion due to the relative movement between metal surfaces and corrosive fluids. 

Selective Corrosion

Selective corrosion occurs in alloys where one of the component metals is de-alloyed by the corrosive environment. This type of corrosion can be seen in brass alloy pipes where zinc is commonly used as another component and here zinc is de-alloyed. 

Uniform Corrosion

In case of uniform corrosion, a uniform layer of rust is formed on the surface of metals and it is extended over the whole surface area of metal. This type of corrosion can be seen in metals which are not protected by surface coating.

Pitting Corrosion

This corrosion occurs in small areas. Pitting corrosion occurs when the protective oxide layer of the surface gets damaged or due to structural defects in metal.

Fretting Corrosion

This corrosion occurs where the two materials are joined together. This occurs at the contact point. This type of corrosion can be seen in bolted and riveted joints, clamped surface, etc.

Stress Corrosion

Stress corrosion caused by the combined action of a corrosive environment and mechanical stress on the surface of the material. In its initial stage, small cracks are developed and these finally leads to failure of the whole structure. 

Inter-granular Corrosion

It occurs along the grain boundaries when difference in reactivity against impurities exists between grain boundaries and grains. This difference in reactivity occurs due to defective welding, heat treatment stainless steels, copper, etc.

Corrosion Fatigue

When the fatigue of metal is developed in the corrosive environment then it called corrosion fatigue. This can be prevented by improving the fatigue resistance of a material.

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Blog written by

Shruti Doshi
Technical Officer – Sanghi Cement & Blogger
shruti.doshi@sanghicement.com
shrutidoshi.1492@gmail.com

Blog Managed by

Nirav Pandya
Digital Marketing Officer – Sanghi Cement
nirav.pandya@sanghicement.com




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