There are intergranular corrosion cracking in stainless steel, all of which have negative effects on the passive film on the surface of stainless steel plate.
还有不锈钢内部的晶间腐蚀开裂，所有这些，对不锈钢板表面的钝化膜都发生破坏作用。
2
Surface atoms and intergranular atoms of nc copper have high activity, and that the passivation ability and the dissolution rate of passive film are increased.