采用浸泡试验及电化学试验，对304、254 SMO和Hastelloy C-276三种材料在醋酸和含有Br -离子的醋酸溶液中的腐蚀行为进行了测试.用SEM和XPS分析点蚀形貌.结果发现材料表面 所形成的钝化膜中含有Cr2O3和MoO2，对材料起保护作用.
Uniform corrosion and pitting corrosion behavior of stainless steel and high-nickel alloys in acetic acid solution containing Br- io n have been investigated. Immersion test method was used to measure general corr osion rate and potentiodynamic cyclic polarization was used to study pitting cor rosion behavior. The tested results found that the material of 304 experienced s erious general corrosion, the next was 254 SMO and the uniform corrosion rate of Hastelloy C-276 was the least. The addition of Br- ion into the solution fast ened the uniform corrosion rate of these materials. In addition, Hastelloy C-276 had a good performance of resisting pitting, the next was 254 SMO and 304 exper ienced serious pitting attack. Micrographs of pits produced after anodical polar ization were observed by SEM. The elements of the surface passivity film were in spected by XPS, whose results indicated that the elements of Cr and Mo played an important role in resisting corrosion. EPMA results indicated that Si, S and O elements existed in the pits, which means that sulfide inclusions were the sites initiating pitting.
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