点状腐蚀

• 冲孔板腐蚀集中于金属表面的局部范围，并迅速问内部发展，***穿透：不锈钥表面与氯离子接触时，阴氯离子容易吸附在钢的表面个别点上，破坏了该处的氧化膜，就很容易发生点状腐蚀。不锈钢的表面缺陷，也是引起点状腐蚀的重要原因***。

均匀腐蚀

• 冲孔板接触腐蚀介质的金属整个表面产生腐蚀的现象，称为均匀腐蚀，也称整体腐蚀。一种表面腐蚀，不锈钢具有良好的耐腐蚀性能，它的均匀腐蚀量并不大。

晶间腐蚀

• 奥氏体不锈钢在450℃~850℃加热时，会由十沿晶界沉淀出铬的碳化物，致使晶粒周边形成贫铬区，在腐蚀介质作用下即可沿品粒边界深入金属内部，产生在品格之间的一种腐蚀，称为晶间腐蚀。此类腐蚀在金属外观术有任何变化时就造成破坏，因此是不锈钢最危险的一种破破坏形式。

英文翻译版

Pitting corrosion
The corrosion of punched plate concentrates on the local area of the metal surface, and develops rapidly in the interior, * * penetration: when the stainless key surface contacts with chloride ion, the anion chloride ion is easy to adsorb on the individual points of the steel surface, which destroys the oxide film on the surface of the steel, so it is easy to have pitting corrosion. The surface of stainless steel is also caused by pitting.
Uniform corrosion
The phenomenon of corrosion on the whole surface of the metal that the punching plate contacts with the corrosive medium is called uniform corrosion, also known as overall corrosion. A kind of surface corrosion, stainless steel has good corrosion resistance, its uniform corrosion is not large.
Intergranular corrosion
When austenitic stainless steel is heated at 450 ℃ ~ 850 ℃, chromium carbide will be precipitated along the grain boundary, resulting in the formation of poor chromium area around the grain boundary. Under the action of corrosive medium, it can penetrate into the metal along the grain boundary and produce a kind of corrosion between the quality, which is called intergranular corrosion. This kind of corrosion causes damage when there is any change in the appearance of the metal, so it is the most dangerous form of destruction of stainless steel.