Abstract
The anodic dissolution behavior of CrS inclusions was compared with that of (Mn,Cr)S inclusions containing around 10 atom % Cr 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 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. Auger electron spectroscopy analysis indicated that chromium-containing oxide films were formed on the CrS inclusions and grew with electrode potential, which suggested that the oxide films on CrS inclusions prevented the anodic dissolution of the inclusions, thereby leading to an increased resistance to pit initiation.
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