2205双相不锈钢在真空条件下氯化物溶液中的点蚀研究  

Pitting Corrosion Behavior of 2205 Duplex Stainless Steel in Sodium Chloride Solution Under Vacuum Condition

作　　者：张雄 郑兴文 左寒阳 刘锋 龚敏 ZHANG Xiong;ZHENG Xingwen;ZUO Hanyang;LIU Feng;GONG Min(School of Chemical Engineering,Sichuan University of Science&Engineering,Zigong 643000,China;School of Materials Science and Engineering,Sichuan University of Science&Engineering,Zigong 643000,China;Key Laboratory of Material Corrosion and Protection of Sichuan Province,Zigong 643000,China)

机构地区：[1]四川轻化工大学化学工程学院,四川自贡643000 [2]四川轻化工大学材料科学与工程学院,四川自贡643000 [3]材料腐蚀与防护四川省重点实验室,四川自贡643000

出　　处：《四川轻化工大学学报（自然科学版）》2020年第1期20-26,共7页Journal of Sichuan University of Science & Engineering(Natural Science Edition)

基　　金：自贡市重点科技计划项目(2017XC14);四川理工学院研究生创新基金(y2018059)。

摘　　要：采用电化学方法和形貌分析研究了真空条件下2205双相不锈钢在NaCl溶液中的点蚀和再钝化行为。结果表明:(1)2205双相不锈钢在真空度为60 kPa的50 g/L NaCl溶液中的临界点蚀温度和再钝化温度均在55℃~60℃之间;(2)随着NaCl浓度(50 g/L^300 g/L)的增加,2205双相不锈钢的临界点蚀温度和再钝化温度变化不明显,但其击穿电位和再钝化电位的值均减小,更容易遭受点蚀破坏;(3)在温度低于临界点蚀温度的30℃下,2205双相不锈钢在不同点蚀发展程度下(强制回扫电流密度0.01 mA/cm^2~5.00 mA/cm^2)均具有良好的再钝化能力。The pitting and repassivation behavior of 2205 duplex stainless steel in NaCl solution under vacuum condition are studied using electrochmical method and morphology analysis.The results show that:(1)the critical pitting temperature and the repassivation temperature of 2205 duplex stainless steel in a 50 g/L NaCl solution under the vacuum degree of 60 kPa are between 55℃~60℃;(2)with the increase of NaCl concentration in the range of 50 g/L^300 g/L,the critical pitting temperature and repassivation temperature of 2205 duplex stainless steel have no obvious change,however,the values of its breakdown potential and repassivation potential decreases,as a result it is easier to suffer pitting damage;(3)when the backward scanning current density is setted in the range of 0.01 mA/cm^2~5.00 mA/cm^2,2205 duplex stainless steel exhibited good repassivation ability in 50 g/L NaCl solution with a vacuum degree of 60 kPa at 30℃ below the critical pitting temperature.

关 键 词：2205双相不锈钢 真空条件 循环极化曲线 点蚀 再钝化 

分 类 号：P574[天文地球—矿物学]