【摘要】 用化学浸泡法对敏化热处理的奥氏体不锈钢AISI 316L和双相不锈钢SAF 2205在含溴醋酸溶液中的耐腐蚀行为进行了研究,并且用光学显微镜观察了敏化试样浸泡前后的金相组织。结果发现,随着Br-质量分数的增加,不锈钢原始材料和敏化材料的腐蚀速率都增大,敏化热处理使不锈钢的耐蚀性能下降。无论是不锈钢的原始材料还是敏化材料,SAF 2205的耐腐蚀性能均优于AISI 316L。对敏化AISI 316L,Br-诱发点蚀优先发生在奥氏体晶界附近;对敏化SAF 2205,Br-诱发点蚀优先发生在γ晶界、某些α/γ相界及α晶界附近。更多还原

【Abstract】 The corrosion behavior of sensitized AISI316L and SAF2205 stainless steels in acetic acid solution containing Br~-ion was investigated by measuring the corrosion weight loss.Microstructure characteristic of sensitized materials before and after immersion test were inspected by optical microscope.It was found that corrosion rates of as-received and sensitized stainless steels were markedly increased with increasing Br~-ion concentration.The sensitizing treatment leads to corrosion resistance decrease. Whether as-received or sensitized materials,the corrosion resistance of SAF2205 stainless steels was superior to AISI316L.Br~-ion induced pitting preferentially occurred at austenitic boundaries for sensitized AISI316L stainless steel.Br~-ion induced pitting preferentially occurred at austenitic boundaries,ferrite-austenite boundaries and ferrite boundaries for sensitized SAF2205 duplex stainless steel.更多还原