摘要
美国等国家发生了不少MnO2引起的凝汽器不锈钢管点蚀。随着我国不锈钢管凝汽器数量和使用时间的增加,也可能会发生类似问题,但目前尚未见到这方面的研究报告。不锈钢管上MnO2的形成有微生物氧化和化学氧化两种途径。不管MnO2是如何在不锈钢表面形成的,均可使开路电位大幅度上升,并可高至约400mV(vs.SCE)。电位正移可能会使开路电位超过点蚀电位从而引起304、316L不锈钢管点蚀。
A lot of pitting of condenser stainless steel（SS） tubes induced by MnO2 took place in USA and some other countries. With the increase of SS condenser quantities and service time in our country, the similar problem may also take place. But no research reports in this field were published. The formation of MnO2 on SS tubes has two main ways, microorganism oxidation and chemical oxidation. The open circuit potential（OCP） value will rise dramatically to around 400 mV（vs. SCE） no matter how MnO2 forms on stainless steel surface. The noble shift can elevate OCP above the critical pitting potential and induce pitting of 304, 316L SS tubes.
出处
《腐蚀与防护》
北大核心
2013年第1期56-59,共4页
Corrosion & Protection
基金
上海市科委资助项目(10DZ0500300
11DZ2210500)
关键词
凝汽器
不锈钢
锰
腐蚀
condenser
stainless steel（SS）
Mn
corrosion
