Fe-Me(Me=Co,Ni,Co-Ni)合金化层表面钝化膜的电化学行为  

Electrochemical Behavior on Surface Passivation Films of Fe-Me(Me=Co,Ni,Co-Ni)Alloying Layers

作　　者：盛敏奇[1,2] 陆历历 翟永杰[1] 钟庆东[2] 王聪[1] 

机构地区：[1]苏州大学沙钢钢铁学院,苏州215021 [2]上海大学上海市现代冶金与材料制备重点实验室,上海200072

出　　处：《腐蚀与防护》2013年第12期1081-1085,共5页Corrosion & Protection

基　　金：国家自然科学基金(51204115;50615024);新世纪优秀人才支持计划(NCET-07-0536);苏州大学大学生创新创业训练计划(2012XJ046)

摘　　要：采用热扩渗方法在低碳钢表面制备了Fe-Co、Fe-Ni和Fe-Co-Ni合金化层。热扩渗过程在1 000℃的纯H_2气氛中进行,处理时间为5 h。采用XRD、EDS和SEM对合金化层的组成和微结构进行了测试,并采用电化学手段分析了合金化层在硼酸缓冲溶液(pH=8.4)中的钝化行为。结果表明,合金化层均为单一α-Fe固溶体相;Fe-Ni合金化层以及镍含量相对高的Fe-Co-Ni合金化层表面易于形成致密的钝化膜;这些钝化膜可以明显改善低碳钢基体在碱性溶液环境中的耐蚀性。Fe-Co, Fe-Ni and Fe-Co-Ni alloying layers were prepared on mild steel by thermal diffusion. Heat treatment of the coated mild steel was performed at 1 000℃ for 5 h in hydrogen atmosphere. The composition and microstructure of the alloying layers were analyzed by XRD, EDS and SEM. A series of electrochemical analysis was carried out to examine the passivation behavior of these alloying layers in borate buffer solution （pH=8.4）. Results indicated that the Fe-Ni alloy layer and the Fe-Co-Ni alloy layer with high Ni content promoted the formation of compact passive films. The passive films significantly improved the corrosion resistance of mild steel substrate in alkaline solution.

关 键 词：低碳钢 合金化层 钝化行为 电化学 腐蚀 

分 类 号：TB304[一般工业技术—材料科学与工程]