镁合金无铬前处理工艺及化学镀镍  

Chromium-free pretreatment and Ni-P alloys technology on magnesium alloy

作　　者：张文雪[1] 周振君[1] 何成[2] 李钢 

机构地区：[1]长安大学材料科学与工程学院,西安710064 [2]西安交通大学金属材料强度国家重点实验室,西安710049 [3]中国金币总公司,北京100053

出　　处：《吉林大学学报（工学版）》2011年第1期78-83,共6页Journal of Jilin University:Engineering and Technology Edition

基　　金：教育部科学技术重点项目(106151);中央高校基本科研业务费专项基金项目(CHD2010JC132);长安大学基础研究支持计划专项基金项目;道路结构与材料交通行业重点实验室开放基金项目

摘　　要：以马日夫盐为主盐,乙醇为溶剂,在AZ91D镁合金上获得一层不完全的转化膜,避免了铬酸刻蚀和HF酸活化。然后以硫酸镍作为化学镀镍磷合金镀液的主盐,选择合适的络合剂,实现了在AZ91D镁合金的表面直接化学镀Ni-P合金,得到的镀层均匀致密,无明显缺陷。对镁合金化学镀镍基合金的无铬前处理工艺参数进行了探讨,并对前处理膜层和后续镍基合金的相组成、微观结构和耐腐蚀性能进行了研究。A chromium-free solution pretreatment technology on AZ91D magnesium alloy substrate is investigated. Then, by selecting suitable cornplexing agent, subsequent Ni-P plating is conducted in a plating bath where nickel ions are provided by sulfate nickel. A uniform, compact and defect free plating layer is obtained by this technology, which exhibits good anticorrosion properties compared with traditional pretreatment. The effect of the chromium-free pretreatment of the magnesium alloy substrate on the electroless Ni-P plating was also investigated. The deposit was characterized by its structure, morphology, anticorrosion properties and microhardness.

关 键 词：材料失效与保护 镁合金 化学镀 镍基合金 耐蚀性 

分 类 号：TG174.4[金属学及工艺—金属表面处理]