高强管线钢钝化表面点蚀机理研究  

Pitting Mechanism of High Strength Pipeline Steel Passive Film

作　　者：张弟[1] 张云霞 梁平[1] 史艳华[1] 赵阳[1] 

机构地区：[1]辽宁石油化工大学机械工程学院,辽宁抚顺113001 [2]辽宁石油化工继续教育学院,辽宁抚顺113001

出　　处：《材料保护》2016年第1期66-68,9,共3页Materials Protection

基　　金：辽宁省教育厅2012年科学研究一般项目(L2012127)资助

摘　　要：目前,有关X100管线钢钝化表面点蚀的研究报道较少。在0.50 mol/L Na HCO3溶液中对X100高强管线钢进行恒电位极化,在其表面形成钝化膜,借助Mott-Schottky曲线计算钝化膜的缺陷密度,采用扫描电镜和能谱仪分析了X100管线钢钝化后第二相夹杂物的物相。采用循环极化曲线及扫描电镜分析了X100管线钢在0.50mol/L Na HCO3+0.01 mol/L Na Cl溶液中钝化表面产生点蚀的原因。结果表明:X100管线钢表面钝化膜的主要成分为Fe2O3和Fe3O4,钝化膜并不完整,氧空位缺陷和无钝化膜的第二相夹杂物同时存在;钝化膜缺陷的不均匀和第二相夹杂物处均可形成闭塞电池,导致稳态点蚀发生。The passive film was formed on X100 high strength pipeline steel in 0.50mol/L NaHCO_3 through potentiostatic polarization.The defect density in the passive film was calculated according to MottSchottky curves,and the second inclusions of X100 pipeline steel after passivation were analyzed by SEM and EDS.Results showed that the main components of the passive film of X100 steel were Fe_2O_3 and Fe_3O_4.Besides,the passive film was not complete,and the defect of oxygen vacancies and inclusions of second phase without passive film existed at the same time,which promoted the formation of the occluded corrosion cell and led to a stable pitting corrosion.

关 键 词：X100管线钢 钝化表面 夹杂物 点蚀 

分 类 号：TG174.4[金属学及工艺—金属表面处理]