Reasons for Fracture Failure of Stainless Steel Trash Rack Paling
摘 要
通过金相检验、扫描电子显微镜观察以及化学成分分析和力学性能测试等方法对拦污栅栅条断裂失效的原因进行了分析。结果表明:一方面,断裂栅条中Cr、Ni含量偏低降低了不锈钢的耐蚀性;另一方面,该栅条曾在服役过程中受到应力作用,且环境中的S2-和Cl-等腐蚀性离子聚集在金属表面,破坏了其表面钝化膜,在腐蚀性离子和应力的共同作用下栅条发生应力腐蚀开裂。
Abstract
The reasons for the fracture failure of trash rack paling were analyzed by metallographic examination, scanning electron microscopy (SEM) observation, chemical composition analysis and mechanical property testing. The results show that the corrosion resistance of the fractured paling was decreased due to the low content of Cr and Ni. The fractured paling was subjected to stress during service. And S2-,Cl- and other corrosive ions in environment gathered in the metal surface, destroyed the passive film on the surface of metal. Stress corrosion cracking occurred in the paling under the combined effect of corrosive ions and stress.
中图分类号 TG142 DOI 10.11973/fsyfh-201804016
所属栏目 失效分析
基金项目
收稿日期 2016/9/27
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引用该论文: LI Dianjie,SI Hong,HU Rirong,WANG Jinfei,HAN Baoyun,ZHANG Qifu. Reasons for Fracture Failure of Stainless Steel Trash Rack Paling[J]. Corrosion & Protection, 2018, 39(4): 323
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【7】GOMEZ-DURAN M,MACDONALD D D. Stress corrosion cracking of sensitized type 304 stainless steel in thiosulphate solution. Ⅱ. dynamics of fracture[J]. Corrosion Science,2006,48(7):1608-1622.
【8】赵木森. 葛洲坝水电厂水工钢结构防腐蚀[J]. 中国三峡建设,2002(6):25-27.
【9】PARDO A,MERINO M C,COY A E,et al. Effect of Mo and Mn additions on the corrosion behaviour of AISI 304 and 316 stainless steels in H2SO4[J]. Corrosion Science,2008,50(3):780-794.
【10】赵江涛,任常飞,张柳丽,等. 元素Cr、Ni对不锈钢耐蚀性能影响[J]. 现代机械,2013(5):88-91.
【11】董允,姜晓霞,林晓娉. 铬、钼对不锈钢腐蚀与腐蚀磨损性能的影响[J]. 机械工程材料,1997,21(6):29-31.
【12】姜涛,于洋,杨胜,等. 从失效案例探讨不锈钢的应力腐蚀问题[J]. 腐蚀与防护,2011,32(4):297-300.
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【14】李会录,余竹焕,强军锋,等. 高强钢WOL试样应力腐蚀开裂的金相跟踪观察[J]. 腐蚀与防护,2008,29(10):587-588.
【15】张吉,马钢. 浅谈奥氏体不锈钢应力腐蚀开裂[J]. 机电产品开发与创新,2013,26(3):69-71.
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