敏化态444不锈钢在热自来水中的点蚀行为  

Pitting Behavior of Sensitized 444 Stainless Steel in Hot Tap Water

作　　者：张敏杰 曾敏航 刘乐乐 辛森森[1] 李谋成[1] ZHANG Minjie;ZENG Minhang;LIU Lele;XIN Sensen;LI Moucheng(Institute of Materials,Shanghai University,Shanghai 200072,China)

机构地区：[1]上海大学材料研究所,上海200072

出　　处：《腐蚀与防护》2021年第10期8-12,共5页Corrosion & Protection

基　　金：国家自然科学基金(U1960103,U1660205)。

摘　　要：采用电化学方法研究了敏化态444不锈钢在80℃自来水中的腐蚀行为。结果表明:在热自来水中,试样的极化电阻随敏化度增加而降低,表面钝化能力降低;耐点蚀性能与敏化度随敏化时间的演变特征相同,敏化度越高,试样的耐点蚀性能越差,点蚀会优先发生在敏化试样的晶界处。The corrosion behavior of sensitized 444 stainless steel in 80℃ tap water was studied by electrochemical method.The results showed that in hot tap water,the polarization resistance of the sample decreased with the increase of the sensitization degree,and the surface passivation ability decreased.The pitting resistance and sensitization degree had similar evolution characteristics with the aging time.The higher the sensitization degree,the worse the pitting resistance performance of the sample.Pitting will occur preferentially at the grain boundaries of the sensitized sample.

关 键 词：444不锈钢 敏化处理 自来水 点蚀 

分 类 号：TG174.4[金属学及工艺—金属表面处理]