某304不锈钢管道泄漏的失效分析
Analysis of Leakage Failure of a Type 304 Stainless Steel Tube
摘 要
某氟化工企业304不锈钢管道在运行三年半后发生泄漏失效。通过直读光谱仪、光学显微镜、扫描电镜和X射线衍射仪等对失效部位材料的化学成分、显微组织、腐蚀形貌及腐蚀产物进行了分析。结果表明：该304不锈钢管道的失效主要为Cl-浓缩造成的点蚀穿孔，H2S的存在则对点蚀起到了促进作用。
失效分析
点蚀
H2S
stainless steel
failure analysis
pitting corrosion
H2S
Abstract
Leakage failure occurred at a 304 stainless steel tube after working for three and a half years in a fluorine chemical enterprise. The chemical composition, microstructure, corrosion morphology and corrosion products of the material in failed part of 304 stainless steel tube were studied using direct reading spectrometry, optical microscopy, scanning electron microscopy and X-ray diffraction. The results show that the major failure mode was pitting corrosion and perforation due to local enrichment of Cl- in the tube, and the existence of H2S promoted pitting corrosion.
中图分类号 TG172 DOI 10.11973/fsyfh-201702016
所属栏目 失效分析
基金项目
收稿日期 2015/9/1
修改稿日期
网络出版日期
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联系人作者龚利华(glh606@sohu.com)
引用该论文: JIANG Zhi-guo,WANG Hui-huang,GONG Li-hua. Analysis of Leakage Failure of a Type 304 Stainless Steel Tube[J]. Corrosion & Protection, 2017, 38(2): 160
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参考文献
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【4】鲁照玲,周志毅,周宇. 换热设备用不锈钢材料腐蚀失效分析[J]. 腐蚀科学与防护技术,2006,18(6):443-445.
【5】JIMENEZ-COME M J,MUNOZ E,GARCIA R,et al. Pitting corrosion behaviour of austenitic stainless steel using artificial intelligence techniques[J]. Journal of Applied Logic,2012,10(4):291-297.
【6】PARDO A,MERINO M C,COY A E,et al. Pitting corrosion behaviour of austenitic stainless-coming effects of Mn and Mo additions[J]. Corrosion Science,2008,50:1796-806.
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