樊学华,于勇,张子如,冯喆,陈丽娟,董磊,张雷.316L奥氏体不锈钢在不同电位下的点蚀和再钝化行为研究[J].表面技术,2020,49(7):287-293.
FAN Xue-hua,YU Yong,ZHANG Zi-ru,FENG Zhe,CHEN Li-juan,DONG Lei,ZHANG Lei.Pitting and Repassivation Behavior of 316L Austenitic Stainless Steel under Different Potentials[J].Surface Technology,2020,49(7):287-293
316L奥氏体不锈钢在不同电位下的点蚀和再钝化行为研究
Pitting and Repassivation Behavior of 316L Austenitic Stainless Steel under Different Potentials
投稿时间:2020-01-10  修订日期:2020-07-20
DOI:10.16490/j.cnki.issn.1001-3660.2020.07.036
中文关键词:  奥氏体不锈钢  极化  电化学阻抗谱  点蚀  再钝化
英文关键词:austenitic stainless steel  polarization  EIS  pitting corrosion  repassivation
基金项目:中国石油集团工程股份有限公司科学研究与技术开发项目(CPECC2018KJ04)
作者单位
樊学华 1.中国石油工程建设有限公司 北京设计分公司,北京 100085 
于勇 1.中国石油工程建设有限公司 北京设计分公司,北京 100085 
张子如 2.北京科技大学 新材料技术研究院,北京 100083 
冯喆 2.北京科技大学 新材料技术研究院,北京 100083 
陈丽娟 1.中国石油工程建设有限公司 北京设计分公司,北京 100085 
董磊 1.中国石油工程建设有限公司 北京设计分公司,北京 100085 
张雷 2.北京科技大学 新材料技术研究院,北京 100083 
AuthorInstitution
FAN Xue-hua 1.China Petroleum Engineering & Construction Co., Ltd Beijing Company, Beijing 100085, China 
YU Yong 1.China Petroleum Engineering & Construction Co., Ltd Beijing Company, Beijing 100085, China 
ZHANG Zi-ru 2.Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China 
FENG Zhe 2.Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China 
CHEN Li-juan 1.China Petroleum Engineering & Construction Co., Ltd Beijing Company, Beijing 100085, China 
DONG Lei 1.China Petroleum Engineering & Construction Co., Ltd Beijing Company, Beijing 100085, China 
ZHANG Lei 2.Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China 
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中文摘要:
      目的 研究外加电位对316L奥氏体不锈钢点蚀和再钝化行为的影响。方法 采用循环极化、恒电位极化,电化学阻抗谱(EIS)等多种电化学测试方法,研究了系列电位与混合电位对316L奥氏体不锈钢点蚀敏感性的影响,并采用扫描电子显微镜(SEM)、X射线光电子能谱(XPS)观察分析钝化膜点蚀形貌和元素含量。结果 在60 ℃的饱和CO2的10 g/L NaCl溶液中,316L奥氏体不锈钢的钝化区间为-0.394~0.168 V,但电位在-0.100~0.168 V之间,即亚稳态点蚀区时,电流出现一定的波动。在钝化区极化时,316L奥氏体不锈钢的稳态电流密度非常低,随外加电位的升高而略有增加,极化后试样表面无点蚀;在亚稳态点蚀区,极化的电流密度较高,极化后,试样表面出现明显的点蚀坑;混合区极化时,电位从0.1 V转换到-0.1 V时,电流密度急剧下降,并稳定在一个较低的电流值。XPS结果表明,在钝化区电位极化后,Cr、Mo元素含量有所升高,而Fe元素发生了选择性溶解。结论 Cr、Mo元素是耐蚀性元素,其氧化物或氢氧化物的存在可促进钝化膜的局部修复,因此电位转换到低电位后,试样表面发生再钝化现象,钝化膜的稳定性增强,材料的耐蚀能力提高。
英文摘要:
      The work aims to investigate the effect of applied potentials on the pitting and repassivation behavior of 316L austenitic stainless steel. Cyclic polarization, potentiostatic polarization and electrochemical impedance spectroscopy tests were selected to study the effect of series potential and mixed potential on pitting sensitivity of 316L austenitic stainless steel. In addition, SEM and XPS were used to observe the pitting morphology and analyze the elemental concentration of passivation film. At 60 ℃, the passive region of 316L austenitic stainless steel in saturated CO2 and 10 g/L NaCl test solution was -0.394~0.168 V, but when the potential was between -0.100~0.168 V, there was a certain current fluctuation, namely metastable pitting zone. The current density of 316L stainless steel in passive region was very small, slightly increasing with the increase of potential and the pit was not observed on the sample surface after polarization. However, the current density of 316L austenitic stainless steel in metastable pitting region was high and obvious pitting appeared on the samples. In the mixed polarization with potential from 0.1 V to -0.1 V, the current density droped sharply and eventually stabilized at a lower current value. Meanwhile, the results of XPS showed that the Cr and Mo concentration increased with the potential transition, but the Fe element was selectively dissolved in this condition. Cr and Mo are corrosion resistance elements, and the existence of the oxides or hydroxides can promote the local repair of passivation film. Therefore, the surface of 316L stainless steel presents repassivation behavior, the stability of the passivation film is enhanced and the corrosion resistance is improved with the transition to low potential.
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