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What is Corrosion and It's Types?

Corrosion is the phenomenon of metals losing their metallic properties by reacting chemically or electrochemically with their environment. There are 6 different types of corrosion: general corrosion, pitting corrosion, selective corrosion, galvanic corrosion, grain boundary corrosion and erosion corrosion . The brief descriptions of these types are as follows:

 

General corrosion: The type of corrosion that occurs evenly on the surface of metals. It causes color change, dullness or rusting on the surface of the metal .

 

Pitting corrosion: The type of corrosion that causes small pits or holes on the surface of metals. The pits grow over time and reduce the strength of the metal .

 

Selective corrosion: The corrosion of one component of alloyed metals faster than the others. For example, copper oxidizes more easily than nickel in copper-nickel alloys .

 

Galvanic corrosion: The type of corrosion that occurs when different metals contact each other or are in a common electrolyte. Electron flow occurs between different metals, causing erosion on the anodic metal .

 

Grain boundary corrosion: The corrosion of the grain boundaries in the crystal structure of metals. The metal composition at the grain boundaries is different from that inside the grain. Improper heat treatment or alloy elements make the grain boundaries more anodic .

 

Erosion corrosion: The combination of erosion and corrosion on the surface of metals caused by fluids or solid particles. The speed of the fluid and the hardness of the solid particles affect the intensity of erosion corrosion .

 

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