AZ31镁合金表面多层膜的结构与性能研究  

Study on structure and properties of multilayer films on AZ31 magnesium alloy surface

作　　者：王兆松[1] 李剑锋[2] 张礼平[1] 董闯[1] 李国卿[1] 

机构地区：[1]大连理工大学三束材料表面改性国家重点试验室,辽宁大连116024 [2]大连交通大学,辽宁大连116028

出　　处：《真空》2008年第3期44-47,共4页Vacuum

基　　金：教育部高等学校科技创新工程重大项目培育资金项目"活性基材表面改性工艺基础研究"的支持

摘　　要：研究了在AZ31镁合金表面依次进行浸锌、化学镀镍、电镀铜、电弧离子镀Cr/CrN的复合镀膜工艺。利用X射线晶体分析仪、扫描电镜、显微硬度计、腐蚀测量系统及热震法等仪器和方法对复合镀层的显微组织及性能进行了研究。结果表明,在此复合镀工艺条件下,可以在AZ31镁合金表面形成致密度高、结合强度好、耐蚀性好且硬度高的复合合金镀层;AZ31镁合金镀膜后的显微硬度形成一个梯度,由71.1HK提高到2224.8 HK;耐蚀性明显提高,腐蚀电位从-1481 mV提高到-382 mV。A composite coating process was carried out in sequence by electrogalvanizing, Ni electrodeless plating, Cu electroplating and Cr/CrN arc ion plating on the surface of AZ31 magnesium alloy. The microstructure and properties of the film coating were studied by X-ray crystal analyzer, SEM, microdurometer, corrosion measurement system and thermal shock tester. The results showed that the composite coating process can plate the composite AZ31 magnesium alloy with high compactness, bonding strength and high corrosion-resistance and hardness. The microhardness of AZ31 magnesium alloy exhibits a gradient from 71.1HK to 2224.8HK after coating. The corrosion-resistance of AZ31 magnesium alloy is improved remarkably with corrosion potential increased to -382mV from -1481mV.

关 键 词：镁合金 化学镀镍 电弧离子镀CrN 耐蚀性 显微硬度 

分 类 号：O484[理学—固体物理] TB43[理学—物理]