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4 应力腐蚀开裂机理由于导致不锈钢材料发生应力腐蚀开裂的因素非常复杂,故解释不锈钢应力腐蚀开裂的理论很多,可谓众说纷云.但不管怎样,不锈钢的应力腐蚀开裂必然首先要发生选择性腐蚀,应力的主要作用在于对钝化膜的破坏及其再钝化的抑制,从而促进局部腐蚀.归纳起来,应力腐蚀开裂的机理可以分为三类:溶解机理;机械机理;混合机理.具体内容列于表2.
4 stress corrosion cracking mechanism As a result of the factors that lead to stress corrosion cracking of stainless steel material is very complicated, so there are many theories to explain the stress corrosion cracking of stainless steel, but in any case, the stress corrosion cracking of stainless steel inevitably must occur selective corrosion, The main role of stress lies in the destruction of passivation film and inhibition of its re-passivation, thereby promoting the local corrosion.In summary, the mechanism of stress corrosion cracking can be divided into three categories: dissolution mechanism, mechanical mechanism, mixing mechanism. Table 2.