Microelectrochemistry on CrS and MnS Inclusions and Its Relation with Pitting Potentials of Stainless Steels
Microelectrochemistry on CrS and MnS Inclusions and Its Relation with Pitting Potentials of Stainless Steels
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DOI：
10.1149/1.3229975
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发表时间：
2009-08
期刊：
影响因子：
--
通讯作者：
I. Muto;Shimpei Kurokawa;N. Hara
中科院分区：
文献类型：
--
作者：
I. Muto;Shimpei Kurokawa;N. Hara
用微电解池在NaCl溶液中对CrS夹杂物和含10at%Cr（Mn，Cr）S的MnS夹杂物的阳极溶解行为进行了比较。与（Mn，Cr）S夹杂物相比，CrS夹杂物具有抗点蚀能力。发现CrS夹杂物的溶解电位在不锈钢的过钝化区。稳定的坑开始在这个潜在的区域。(Mn不锈钢钝化区中的夹杂物（Cr、S）溶解，点蚀电位低于含CrS的不锈钢。对CrS夹杂物表面膜的AES分析表明，CrS夹杂物表面形成了含铬的氧化膜，并随电极电位的增加而生长，这表明CrS夹杂物表面的氧化膜阻止了夹杂物的阳极溶解，从而提高了抗点蚀能力。
The anodic dissolution behavior of CrS inclusions was compared with that of MnS inclusions containing around 10 at% Cr, (Mn,Cr)S, using a microelectrochemical cell in NaCl solutions. CrS inclusions were resistant to pit initiation compared with (Mn,Cr)S inclusions. The dissolution potential of CrS inclusions was found to be in the transpassive region of stainless steels. Stable pits were initiated in this potential region. (Mn,Cr)S inclusions dissolved in the passive region of stainless steels, providing lower pitting potentials than those of CrS-containing stainless steels. AES analysis of the surface films on CrS inclusions indicated that chromium-containing oxide films were formed on the CrS inclusions and grew with electrode potential, which suggested the oxide films on CrS inclusions prevented the anodic dissolution of the inclusions, thereby leading to an increased resistance to pit initiation.