低碳钢表面Fe-Co合金层的热扩渗制备及腐蚀电化学行为  

Thermal Diffusion Preparation and Electrochemical Corrosion Behavior of Fe-Co Alloy Coatings on Surface of Mild Steel

作　　者：盛敏奇[1,2] 万康[1] 钟庆东[2] 许继芳[1] 吕臣凯[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10期870-873,905,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)

摘　　要：利用热扩渗方式,以Co_3O_4纳米粉体做钴源,在低碳钢表面制备了Fe-Co合金层。研究了处理温度对合金层表面状态和结构的影响,并在3.5%NaCl溶液中对合金层进行了腐蚀电化学研究。结果表明,处理温度高于800℃可在低碳钢表面形成厚度>25μm,表面钴含量>20%,并与基底形成冶金结合的Fe-Co合金层,合金层为单一铁固溶体相。通过在低碳钢表面制备Fe-Co合金层可以明显改善其在3.5%NaCl溶液中的耐蚀性。Fe-Co alloy coatings were prepared on the surface of mild steel by means of thermal diffusion, using nano- Co304 powder as the source of Co element. The effects of treatment temperature on surface state, structure and corrosion resistance of the Fe-Co alloy coatings were investigated by electrochemical methods in 3.50/oo NaCi solution. The results show that when the treatment temperatureS800℃, single Fe solid solution phase Fe-Co alloy coatings （〉25 μm） formed and the surface Co content（atomic fraction） was higher than 20at.%, and the coatings and substrate were integrated to metallurgy structure. The preparation of Fe-Co alloy coatings on miid steel surface can significantly improve the corrosion resistance in the 3.5 % NaC1 solution.

关 键 词：低碳钢 Fe-Co合金层 热扩渗 腐蚀 电化学 

分 类 号：TG174[金属学及工艺—金属表面处理] TB304[金属学及工艺—金属学]