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Stainless Steel Intergranular Corrosion:
Jun 26, 2017

Intergranular corrosion is a common localized corrosion. Corrosion develops along the grain boundary of a metal or alloy or its adjacent area, where the corrosion of the grain itself is slight, and this corrosion is called intergranular corrosion.

This corrosion makes the binding force between the grains greatly weakened, serious mechanical strength can be completely lost. For example, the corrosion of stainless steel I-beam, the surface looks very bright, but can not withstand the light knock will be broken into fine particles. As intergranular corrosion is not easy to check, so Tingmin equipment suddenly broken ten, it is very harmful. Stainless steel, nickel-based alloy, aluminum alloy, magnesium alloy, etc. are intergranular corrosion sensitive materials. In the case of heating or welding process will cause intergranular corrosion problems. With the intergranular corrosion as the origin, in the joint action of stress and medium, can make stainless steel, aluminum and other induced intergranular stress corrosion, so intergranular corrosion is sometimes the precursor of stress corrosion.

Under normal corrosive conditions, the grain boundary activity in the passivation alloy is not significant, but when it has the sensitivity of intergranular corrosion, the intergranular activity is very large, that is, there is a certain potential between the lattice and grain boundaries Poor, this is mainly caused by changes in the organization when the alloy is not heated. So intergranular corrosion is a local corrosion caused by tissue electrochemical inhomogeneity. In addition, there are impurities in the grain boundary, in a certain medium will also cause intergranular corrosion.

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