电弧喷涂法制备Zn-Al-Mg-RE-Si非平衡组织涂层及其性能研究  

Study on Preparation of Zn-Al-Mg-RE-Si Non-Equilibrium Coatings by Electric Arc Spraying and Their Properties

作　　者：刘奎仁[1] 朱琦[1] 马鹏程[1] 陈建设[1] 

机构地区：[1]东北大学,辽宁沈阳110004

出　　处：《稀有金属材料与工程》2010年第3期498-501,共4页Rare Metal Materials and Engineering

基　　金：国家高技术研究发展计划("863"计划)(2004AA001220)

摘　　要：采用电弧喷涂法,用Zn-Al-Mg-RE-Si粉芯丝材制备非平衡组织涂层,通过铜醋酸加速盐雾(CASS)试验、失重试验、XRD、SEM、极化曲线以及电化学阻抗谱来研究Zn-Al-Mg-RE-Si非平衡组织涂层的耐蚀性能。研究表明:制备的Zn-Al-Mg-RE-Si涂层是形似玻璃态的非平衡组织涂层,但并非非晶态,涂层具有自封闭效果,且腐蚀初期涂层表面形成的致密腐蚀产物层能够阻缓腐蚀的继续,其腐蚀速率明显低于正常涂层;Zn-Al-Mg-RE-Si非平衡组织涂层较正常涂层的腐蚀电位更正,腐蚀电流密度约是正常涂层的1/2,其电化学反应电阻Rt是正常涂层电化学反应电阻的2倍。Zn-Al-Mg-RE-Si非平衡组织涂层较正常涂层具有更优异的耐蚀性能。Non-equilibrium coatings were prepared from Zn-Al-Mg-RE-Si powder core spun alloy by electric arc spraying, and the corrosion resistances of non-equilibrium coatings were investigated by copper accelerated acetic acid salt spray test （CASS）, mass-loss test, XRD, SEM, polarization curves and electrochemical impedance spectroscopy. The results show that the obtained Zn-Al-Mg-RE-Si coatings are non-equilibrium texture like glassy state but not amorphous texture, and their corrosion rate is obviously slower than that of normal coatings due to large quantity of compact corrosion products attaching to the surface of coatings and preventing breakage of coatings, which indicates the self-sealing effectiveness of non-equilibrium coatings. While the corrosion potential of non-equilibrium coatings is more positive than that of normal coatings, and the corrosion current is only half of that of normal coatings. Furthermore, the charge-transfer resistance is twice as big as that of normal coatings which shows that the corrosion resistance of non-equilibrium coatings is superior to that of normal coatings

关 键 词：腐蚀 电弧喷涂 CASS试验 非平衡 耐蚀性 

分 类 号：TG174[金属学及工艺—金属表面处理]