凝汽器不锈钢管锰致腐蚀初探
Preliminary Study on Mn-Related Corrosion of Condenser Stainless Steel Tubes
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400 mV(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。
不锈钢
锰
腐蚀
condenser
stainless steel(SS)
Mn
corrosion
Abstract
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.
中图分类号 TG172
所属栏目 专论
基金项目 上海市科委资助项目(10DZ0500300; 11DZ2210500)
收稿日期 2011/1/15
修改稿日期
网络出版日期
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备注梁磊, 研究员,
引用该论文: LV Nan-nan,LIANG Lei,LIN Jian-zhen,LI Ming-Li,PAN Yi-qiong. Preliminary Study on Mn-Related Corrosion of Condenser Stainless Steel Tubes[J]. Corrosion & Protection, 2013, 34(1): 56
被引情况:
【1】梁磊,张建良,李小利,赵阳,刘世宏, "溴化锂机组不锈钢焊接管腐蚀失效的原因",腐蚀与防护 36, 1198-1201(2015)
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参考文献
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【2】梁磊, 周国定, 解群. 凝汽器使用不锈钢管应注意的几个问题[J]. 中国电力, 2000(8):84-87.
【3】梁磊, 周国定, 解群, 等. 不锈钢管在我国凝气器上的应用前景[J]. 中国电力, 1998(11):37-41.
【4】Machiels A, Munson D. The role of manganese dioxide (MnO2) deposition in microbiologically influenced corrosion[R]. EPRI, Palo Alto CA:2004.1009597.
【5】Linhardt P. Twenty years of experience with corrosion failures caused by manganese oxidizing microorganisms[J]. Materials and Corrosion, 2010, 61(12):1034-1039.
【6】曾锡莲, 阳富强. 湖南省湘潭锰矿596名儿童发锰含量的调查报告[J]. 广东微量元素科学, 1995, 2(4): 32-33.
【7】Dickinson W H. Manganese-dependent corrosion of stainless steel in an open recirculating service water system[C]//EPRI Service Water System Reliability Improvement Seminar, Williamsburg VA:1998.
【8】Dickinson W H, Caccavo Jr F, Lewandowski Z. The ennoblement of stainless steel by manganic oxide biofouling[J]. Corros Sci, 1996, 38(8):1407-1422.
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