Intergranular corrosion test

Intergranular corrosion is mainly due to the difference of chemical composition between the grain surface and internal, and the existence of grain boundary impurities or internal stress. Intergranular corrosion damages the adhesion between grains, reduces the mechanical strength of the metal. The surface of metals and alloys remains certain metallic luster after the occurrence of corrosion, no signs of being destroyed, but the adhesion between grains weakens, mechanical performance deterioration, cannot withstand tapping, so it is a very dangerous corrosion. It appears in some stainless steel, brass, hard alloy and nickel alloy usually.

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