表面粗糙度及氢对S32750 SDSS在模拟海水中腐蚀行为的影响  

Effect of Surface Roughness and Hydrogen on the Corrosion Behavior of S32750 SDSS in Simulated Seawater

作　　者：张棣尧 赵宏伟 张云霞[1] 郭宇 梁平[1] ZHANG Di-yao;ZHAO Hong-wei;ZHANG Yun-xia;GUO Yu;LIANG Ping(Liaoning Shihua University,Fushun 113001,China)

机构地区：[1]辽宁石油化工大学机械工程学院,抚顺113001

出　　处：《当代化工》2022年第2期309-313,共5页Contemporary Chemical Industry

基　　金：辽宁省科技厅2018年省自然科学基金指导计划项目(项目编号:20180550348)。

摘　　要：对于富氢服役工况下的钢材结构,其服役时间以及服役性能都与其表面粗糙度有很大关系,但是目前对于S32750超级双相不锈钢富氢环境下的表面粗糙度研究较少。为此采用开路电位(OCP)测试法、电化学阻抗谱(EIS)等方法,研究了表面粗糙度Ra分别为0.244、0.178、0.124、0.054μm的S32750 SDSS充氢后在3.5%NaCl溶液中的腐蚀行为。结果表明:随着表面粗糙度Ra的增大,开路电位越负,容抗弧直径越小,耐蚀性大幅降低。表面粗糙度越大,在富氢环境下试件表面发生的点蚀越严重。For the steel structure under hydrogen-rich service conditions,its service time and service performance are closely related to its surface roughness.However,there are currently few studies on the surface roughness of S32750 super duplex stainless steel in a hydrogen-rich environment.In this paper,using open circuit potential(OCP)testing methods,electrochemical impedance spectroscopy(EIS)and other methods,corrosive behavior of S32750 SDSS under the surface roughness Ra of 0.244,0.178,0.124,0.054μm after hydrogen charging in 3.5%NaCl solution was studied.The results showed that as the surface roughness Ra increased,the open circuit potential became more negative,the capacitive reactance arc diameter became smaller,and the corrosion resistance was greatly reduced.The greater the surface roughness was,the more serious the pitting corrosion on the surface of the specimen in a hydrogen-rich environment was.

关 键 词：S32750 SDSS 表面粗糙度 电化学测试 耐蚀性 

分 类 号：TG172.5[金属学及工艺—金属表面处理]