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虽然奥氏体不锈钢在42％MgCl_2沸腾溶液中的应力腐蚀并不是由氢致开裂引起的,但在应力腐蚀过程中生成的氢可以进入试样并可在裂纹前沿富集。为澄清进入试样的氢是否对阳极溶解过程产生促进作用,曾有人用失重法、晶间腐蚀和极化曲线变化等研究氢对阳极行为的影响,并得出氢促进阳极溶解的结论。应当指出,充氢试样的阳极电流包括了氢的氧化电流,因此充氢后阳极电流的增大并不证明氢促进了阳极溶解过程。虽然失重法能反映氢的促进作用,但只适用于腐蚀较为严重的情况。
Although the stress corrosion of austenitic stainless steels in 42% MgCl 2 boiling solution is not caused by hydrogen-induced cracking, the hydrogen generated during stress corrosion can enter the specimen and can accumulate at the crack front. In order to clarify whether the hydrogen entering the sample has a positive effect on the anode dissolution process, the effect of hydrogen on the anode behavior has been studied by the weight loss method, intergranular corrosion and polarization curve changes, and the conclusion that hydrogen promotes anode dissolution has been drawn. It should be noted that the anode current of the hydrogen-filled sample includes the oxidation current of the hydrogen, and therefore the increase of the anode current after charging the hydrogen does not prove that hydrogen promotes the anodic dissolution process. Although weight loss method can reflect the promotion of hydrogen, but only for more serious erosion.