15CrMo钢在含有SO42-的模拟汽轮机初凝水中的腐蚀特性
Corrosion Behaivors of 15CrMo Steel in Simulated Initial-condensate Water Containing SO42- Ions of Different Concentrations
摘 要
采用电化学方法考察了15CrMo钢在含有不同浓度SO42-汽轮机初凝水中的腐蚀特性;通过光学显微镜、扫描电镜(SEM)结合EDS能谱仪观察和分析了15CrMo钢表面腐蚀产物形貌和化学成分, 采用X射线衍射(XRD)分析了腐蚀产物的物相成分。结果表明, 随着SO42-含量的增加, 15CrMo钢的腐蚀电位负移, 腐蚀电流密度增加, SO42-可以造成15CrMo钢的点蚀, SO42-浓度越大, 其造成的腐蚀越严重。
SO42-
点蚀
火电机组
15CrMo steel
SO42-
pitting
thermal power generating unit
Abstract
The corrosion behaviors of 15CrMo steel were investigated in the stimulated initial-condensate water containing SO42- ions of different concentrations. The results of electrochemical measurements showed that the presence of SO42- rendered the negative shift of the corrosion potential. The corrosion current density increased with increasing the concentration of SO42- ions. The microstructure and chemical composition of the corrosion products were characterized by scanning electron microscopy (SEM) coupled with energy dispersive X-ray (XRD). The results showed that adsorption of SO42- led to a local acidification and pitting on the steel surface.
中图分类号 TG174
所属栏目 试验研究
基金项目 上海市基础研究重点项目(11JC1404400)
收稿日期 2014/2/11
修改稿日期
网络出版日期
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备注张大全(1968-), 教授, 博士, 从事腐蚀监测与评价相关研究,13371895945.
引用该论文: MENG Yu,ZHANG Li,SHI Ran-feng,WU Chong-tian,ZHANG Da-quan. Corrosion Behaivors of 15CrMo Steel in Simulated Initial-condensate Water Containing SO42- Ions of Different Concentrations[J]. Corrosion & Protection, 2014, 35(12): 1208
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参考文献
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【3】El-NAGGAR M M. Effects of Cl-, NO3- and SO42- anions on the anodic behavior of carbon steel in deaerated 0.50 M NaHCO3 solutions[J]. Applied surface science,2006,252(18):6179-6194.
【4】熊书华,朱志平,荆玲玲,等. 锅炉水冷壁管在含SO42-溶液中的点蚀特性研究[J]. 热能动力工程,2012,27(1):91-95.
【5】刘晓敏,史志明,许刚,等. 硫酸盐和温度对钢筋腐蚀行为的影响[J]. 中国腐蚀与防护学报,1999,19(1):55-59.
【6】费小丹,李明齐,蔡铎昌. 硫酸根浓度对X70钢在卵石黄泥土中腐蚀行为的影响[J]. 腐蚀与防护,2009,30(8):542-544.
【7】周国定, 冯益奇． 铜/低电导率介质体系的交流阻抗研究[J]. 腐蚀与防护, 1991, 12(6): 277-281.
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