Pitting Susceptibility of 316L Stainless Steel in NaCl Solution with Different Dissolved Gases
摘 要
分别采用动电位法和恒电位法得到了316L不锈钢在溶有不同气体(CO2,N2,O2,H2S+CO2,H2S)NaCl溶液中的阳极极化曲线和I-t曲线,并研究了316L不锈钢的点蚀敏感性以及蚀坑的形貌、蚀坑处的元素分布.结果表明:溶解气体对316L不锈钢点蚀敏感性影响从小到大的顺序为CO2、N2、O2、H2S+CO2、H2S;当H2S与CO2两种气体以11的体积比共存时,点蚀主要受H2S控制;点蚀优先在316L不锈钢中铝的氧化物处萌生,该处铬、钼、镍耐蚀合金元素含量的下降有利于蚀坑的进一步发展.
Abstract
The anodic polarization curves and current-time curves of 316L stainless steel in NaCl solution with different dissolved gases,such as CO2,N2,O2,H2S+CO2 and H2S,were obtained by potentiodynamic polarization and potentiostatic polarization test methods respectively,the pitting susceptibility of 316L stainless steel was studied,as well as the morphology of the corrosion pits and element distribution in the corrosion pits.The results show that the increasing order of pitting susceptibility of 316L stainless steel influenced by dissolved gases was CO2,N2,O2,H2S+CO2 and H2S.The pitting of 316L stainless steel was mostly controlled by H2S when the volume ratio of H2S to CO2 was 11.The pitting was prior to nucleation at the location of Al-oxide in 316L stainless steel,and the corrosion pit further developed because of the decrease of Cr,Mo and Ni contents around inclusions location.
中图分类号 TG172 DOI 10.11973/jxgccl201507020
所属栏目 材料性能及其应用
基金项目 国家自然科学基金资助项目(51374180)
收稿日期 2014/2/19
修改稿日期 2015/5/20
网络出版日期
作者单位点击查看
备注王威(1985-),男,四川眉山人,硕士研究生.
引用该论文: WANG Wei,REN Cheng-qiang,ZENG De-zhi,DU Lei,JIANG Fang. Pitting Susceptibility of 316L Stainless Steel in NaCl Solution with Different Dissolved Gases[J]. Materials for mechancial engineering, 2015, 39(7): 95~98
王威,任呈强,曾德智,杜磊,姜放. 316L不锈钢在溶有不同气体NaCl溶液中的点蚀敏感性[J]. 机械工程材料, 2015, 39(7): 95~98
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参考文献
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【3】李科,施岱艳,李天雷,等.含CO2 气田用 316L 奥氏体不锈钢的应用边界条件[J].机械工程材料,2012,36(11):26-28.
【4】杜楠,黄乐,徐珊,等.304不锈钢点蚀行为的电化学噪声研究[J].失效分析与预防,2009,4(2):71-76.
【5】龚敏,黄文恒,邹振,等.2 种温度下 O2 对 2205DSS 在盐卤介质中点蚀行为的影响[J].材料保护,2009 (10):23-25.
【6】胡永碧,谷坛.高含硫气田腐蚀特征及腐蚀控制技术[J].天然气工业,2012,32(12):92-96.
【7】GARBER J D,PATIL V B,YAP K M.CO2,H2S and bacteria pitting corrosion model[C]//Corrosion.Houston,TX:NACE International,2011.
【8】ANSELMO N,MAY J E,MARIANO N A,et al.Corrosion behavior of supermartensitic stainless steel in aerated and CO2 saturated synthetic seawater[J].Materials Science and Engineering:A,2006,428(1):73-79.
【9】BANAA J,LELEK-BORKOWSKA U,MAZURKIEWICZ B,et al.Effect of CO2 and H2S on the composition and stability of passive film on iron alloys in geothermal water[J].Electrochimica Acta,2007,52(18):5704-5714.
【10】ZHENG S Q,CHEN L Q.Mechanism of (Mg,Al,Ca)-oxide inclusion-induced pitting corrosion in 316L stainless steel exposed to sulphur environments containing chloride ion[J].Corrosion Science,2013,67(2):20-31.
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【13】LU Y C,CLAYTON C R,BROOKS A R.A bipolar model of the passivity of stainless steels-part II:the influence of aqueous molybdate[J].Corrosion Science,1989,29(7):863-880.
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