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首页> 外文期刊>International Journal of Electrochemical Science >Corrosion of Heat-Treated 304SS in the Presence of Molybdate Ions in Hydrochloric Acid
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Corrosion of Heat-Treated 304SS in the Presence of Molybdate Ions in Hydrochloric Acid

机译：盐酸中钼酸盐存在下热处理304SS的腐蚀

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The electrochemical behaviors of quenched (non-sensitized) and furnace-cooled (sensitized) 304SSstainless steels have been thoroughly investigated in 0.1M HCl as a function of molybdate ionso o concentration at 22 C and 50 C. Standard corrosion techniques that have been used includepotentiostatic polarization, polarization resistance vs. time (Rp vs. t), and cyclic polarizationmeasurements. The non-sensitized steel showed better resistance to pitting corrosion than theo o sensitized steel when tested in 0.1M HCl at 22 C and 50 C. Furthermore, both steels showed bettero o resistance at 22 C in comparison to 50 C. While the addition of molybdate ions at sufficientconcentrations ( 0.075M) enhanced significantly both the resistance to general corrosion and to pittingcorrosion in both steels, the non-sensitized steel showed better resistance especially when tested at 22o o o C. Testing both steels at low concentrations of molybdate ions (0.001M) at 22 C and 50 C resultedin increasing the corrosion current densities, icorr, combined by increasing the repassivation (protection)potential, Epp. It is suggested that molybdate ions increase resistance to general and pitting corrosionby lowering the current densities in the active and passive regions by means of chemical reactions,enhancing repassivation in the process and making it difficult for stable pits to grow.
机译：淬火（非敏化）和炉冷（敏化）304SS不锈钢的电化学行为已在0.1M HCl中作为钼酸盐离子浓度在22 C和50 C的函数进行了彻底研究。已使用的标准腐蚀技术包括恒电位极化，极化电阻与时间（Rp与t）以及循环极化测量。当在0.1 M HCl中于22 C和50 C下进行测试时，非敏化钢显示出比Theo o敏化钢更好的抗点蚀性能。此外，与50 C相比，两种钢在22 C下均显示出更好的耐点蚀性能。足够浓度（0.075M）的钼酸根离子显着增强了两种钢的耐一般腐蚀和点蚀的能力，非敏化钢表现出更好的抗性，尤其是在22o oo C下测试时。两种钢均在低浓度的钼酸根离子（0.001 M）在22°C和50°C下导致腐蚀电流密度icorr增加，同时增加了重新钝化（保护）势Epp。建议钼酸根离子通过化学反应降低活性区和钝化区的电流密度，增强工艺中的再钝化，使稳定的点蚀难以生长，从而提高了对一般腐蚀和点蚀的抵抗力。

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