不同阴离子对40CrNi2Si2MoVA钢腐蚀行为的影响  

Effect of different anion environments on corrosion behavior of 40CrNi2Si2MoVA steel

作　　者：李松梅[1] 辛长胜[1] 刘建华[1] 于美[1] 文陈[1] 

机构地区：[1]北京航空航天大学材料科学与工程学院,北京100191

出　　处：《材料热处理学报》2013年第10期146-152,共7页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金资助项目(51171011)

摘　　要：采用全浸加速腐蚀实验以及电化学实验方法,研究了40CrNi2Si2MoVA钢在0.5 mol/L NaNO3、NaCl和Na2SO4溶液中的腐蚀行为,并利用扫描电子显微镜(SEM)和X射线衍射分析(XRD)对腐蚀形貌及腐蚀产物进行了表征。结果表明:40CrNi2Si2MoVA钢在0.5 mol/L的NaNO3、NaCl和Na2SO4溶液中的腐蚀形貌及生成的腐蚀产物均不同,NaNO3溶液中生成的腐蚀产物主要为α-FeOOH,吸附在基体表面,阻碍了基体的腐蚀,3种阴离子环境对其腐蚀速率大小依次为:SO42->Cl->NO3-。电化学研究结果表明40CrNi2Si2MoVA钢在0.5 mol/L的NaNO3、NaCl和Na2SO4溶液中均未发生钝化现象,且在Na2SO4溶液中的腐蚀电流和阳极塔菲尔斜率最大。Corrosion behavior of 40CrNi2Si2MoVA steel was analyzed through immersion accelerate corrosion experiment and electrochemical methods in 0.5 mol/L NaNO3, NaCl and Na2SO4 solutions. The morphology of 40CrNi2Si2MoVA steel after corrosion for different time was observed by SEM and the composition of corrosion products was determined by XRD. The results show that corrosion conducts and morphology of the corroded 40CrNi2Si2MoVA steel are different in O. 5 mol/L NaNO3 , NaCl and Na2SO4 solutions. The generated α-FeOOH which absorbed on the substrate of the steel hinders the corrosion of substrate in NaNO3 solution. The corrosion rate of 40CrNi2Si2MoVA steel in these environments is ranked in the order of SO42- 〉 C1- 〉 NO3-. There are no passivation of 40CrNi2Si2MoVA steel in 0. 5 mol/L NaNO3, NaCl and Na2SO4 solutions, respectively. The corrosion current and anodic tafel slope of 40CrNi2Si2MoVA steel in Na2SO4 solution are the biggest.

关 键 词：40CrNi2Si2MoVA钢 阴离子 腐蚀产物 表面形貌 电化学 

分 类 号：TG172.5[金属学及工艺—金属表面处理]