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通过电化学技术,采用模拟贫铬区的钢种研究了敏化奥氏体不锈钢在H_2S_2O_6介质中的应力腐蚀破裂机理。研究表明:晶间型应力腐蚀破裂的产生是由于电化学腐蚀与局部应力同时集中在晶界贫铬区,加速裂纹始发并沿晶扩展所致。同时还研究了析出相的极化行为,表明析出相对应力腐蚀破裂有一定的关系,但不是析出相本身的活性溶解。
The mechanism of stress corrosion cracking of sensitized austenitic stainless steel in H_2S_2O_6 medium was studied by electrochemistry technique. The results show that the intergranular stress corrosion cracking is caused by electrochemical corrosion and localized stress concentration in the chromium-depleted region of the grain boundary at the same time, which accelerates the initiation of the crack and broadens the grain boundaries. At the same time, the polarization behavior of the precipitated phase was also studied, indicating that the precipitation has a certain relationship with the stress corrosion cracking, but not the active dissolution of the precipitated phase itself.