海水环境中Cl^-浓度对316L不锈钢腐蚀行为的影响  

Influence of Cl^- Concentrations on the Corrosion Behavior of 316L Stainless Steel in Ocean Environment

作　　者：张鸣伦 王丹[1] 王兴发 谢飞[1] 邵冬雪 孙凯 沈歌 韩海仓 ZHANG Ming-lun;WANG Dan;WANG Xing-fa;XIE Fei;SHAO Dong-xue;SUN Kai;SHEN Ge;HAN Hai-cang(College of Petroleum Engineering,Liaoning Shihua University,Fushun 113001,China;PetroChina Liaohe Oilfield Oil and Gas Gathering and Transportation Company,Panjin 124001,China;.Construction Company of Liaohe Oilfield,Panjin 124001,China)

机构地区：[1]辽宁石油化工大学石油天然气工程学院,辽宁抚顺113001 [2]中石油辽河油田油气集输公司,辽宁盘锦124010 [3]辽河油田建设工程公司,辽宁盘锦124001

出　　处：《材料保护》2019年第1期34-39,共6页Materials Protection

基　　金：国家自然科学基金(51604150);辽宁省基本科研项目(L2017LQN016)资助

摘　　要：为了探明Cl^-浓度对海水环境下金属材料的腐蚀影响,通过极化曲线、交流阻抗和循环伏安曲线,并结合Mott-Schottky曲线,分析了在不同Cl^-浓度的海水模拟溶液中316L不锈钢的电化学腐蚀行为。结果表明:在海水环境中,高浓度的Cl^-环境会使316L不锈钢试件的容抗弧直径减小,腐蚀电位下降,抗腐蚀能力变弱;在高Cl^-浓度下,不锈钢表面钝化膜更易破裂,且钝化膜的自我修复能力受到抑制; Cl^-浓度越大,空间电荷层厚度减少变化趋势越快,钝化膜腐蚀溶解的速率越快,316L不锈钢发生腐蚀的概率越大。In order to determine the effect of Cl^- concentration on the corrosion of metallic materials in ocean environment,the electrochemical corrosion behaviors of 316 L stainless steel in simulated seawater with different Cl^- concentrations were analyzed by means of polarization curves,electrochemical impedance spectroscopy,cyclic voltammetry curves and Mott-Schottky plots. Results showed that in simulated seawater with high Cl^- concentration,the diameter of capacitive reactance arc of 316 L stainless steel reduced,and the corrosion potential declined,which demonstrated that the corrosion resistance decreased. Meanwhile,under high Cl^- concentration,the passivation layer on stainless steel was easy to break,and the self-healing capacity of passivation layer was restrained. In general,the increase of Cl^- concentration caused the rapid loss of the thickness of space charge layer and the higher corrosion-dissolving rate of passivation layer,and therefore the probability of corrosion on the 316 L stainless steel became greater.

关 键 词：海水环境 CL^-浓度 316L不锈钢 腐蚀 

分 类 号：TG172.5[金属学及工艺—金属表面处理]