摘要
采用超音速火焰(HVOF)喷涂技术在Q235钢上制备了WC-CoCr涂层,借助X射线衍射仪、扫描电镜、显微硬度计等对涂层的相结构、显微组织和显微硬度进行了分析。以镀铬涂层作为对比材料,用Parstat 2273型电化学综合测试系统测定涂层在不同环境下的耐腐蚀性。结果表明:涂层厚度约为180μm,含有极少的空隙,涂层的平均硬度约1 300HV;在质量分数为3.5%的NaCl溶液和1mol/L的HCl溶液中,WC-CoCr涂层的耐腐蚀性明显优于镀铬涂层的耐腐蚀性;而在1mol/L的NaOH溶液中,WC-CoCr涂层的耐腐蚀性比镀铬涂层的要差,这是因为镀铬涂层发生了剧烈的钝化作用。
WC-CoCr coatings were fabricated on Q235 steel by high velocity oxygen fuel(HVOF)spraying.The phase composition,microstructure and microhardness of the coatings were analyzed by X-ray diffraction,scanning electron microscope and microhardness tester.Electrochemical tests were carried out to compare the corrosion resistance of HVOF sprayed WC-CoCr coating to that of hard chromium coating via a Parstat 2273 advanced electrochemical system.The results showed that WC-CoCr coating had a thickness of 180μm with few pores,and the average microhardness of the coating was about 1 300HV.The corrosion resistance of WC-CoCr coating was better than that of hard chromium coating in 3.5%(mass fraction)NaCl solution and 1mol/L HCl solution.However,the corrosion resistance of WC-CoCr coating was worse than that of hard chromium coating in1mol/L NaOH solution,which was due to the severe passivation of hard chromium coating.
出处
《理化检验（物理分册）》
CAS
2014年第7期476-479,共4页
Physical Testing and Chemical Analysis(Part A:Physical Testing)
基金
中央高校基本科研业务费资助项目(2013B34414)
河海大学大学生创新训练计划项目(2013102941002G)
