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Inhibition effect of metal cations to intergranular stress corrosion cracking of sensitized Type 304 stainless steel

机译：金属阳离子对敏化304型不锈钢晶间应力腐蚀开裂的抑制作用

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摘要

Inhibition effect of metal cation to intergranular stress corrosion cracking (IGSCC) of sensitized Type 304 stainless steel has been investigated by slow strain rate technique (SSRT) with a dynamic crack observation system. The SCC tests were conducted in fully-deaerated aqueous solutions containing various metal sulfates of 10~(-5)kmol/m~3 at 95℃. Metal cations of Na~+, Ca~(2+), Mn~(2+) and Zn~(2+) were selected in this study, and were characterized by a hardness based on the hard and soft acids and bases (HSAB) concept. As a result, it was found that a hard metal cation in the test solution increased crack initiation time and decreased mean crack initiation frequency. In other words, metal cations with larger hardness have an ability of suppressing initiation process of the IGSCC. On the other hand, apparent mean crack velocity was independent of the hardness of metal cation. The finding that the metal cations with large hardness inhibit initiation of the IGSCC was able to be rationally explained on the basis of the passive film model combined with the HSAB concept.
机译：利用慢应变速率技术（SSRT）和动态裂纹观察系统，研究了金属阳离子对敏化304不锈钢的晶间应力腐蚀开裂（IGSCC）的抑制作用。 SCC测试是在95℃下，在含有10〜（-5）kmol / m〜3的各种金属硫酸盐的完全脱气的水溶液中进行的。本研究选择了Na〜+，Ca〜（2 +），Mn〜（2+）和Zn〜（2+）的金属阳离子，并根据硬，软酸和碱（HSAB）的硬度对其进行了表征。 ）的概念。结果，发现测试溶液中的硬金属阳离子增加了裂纹萌生时间并降低了平均裂纹萌生频率。换句话说，具有较大硬度的金属阳离子具有抑制IGSCC的引发过程的能力。另一方面，表观平均裂纹速度与金属阳离子的硬度无关。基于钝化膜模型结合HSAB概念，可以合理地解释具有高硬度的金属阳离子抑制IGSCC引发的发现。

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