厚度、划伤对铝合金双层镀镍耐腐蚀性能的影响  

Effect of Thickness and Scratch on Corrosion Resistance of Double Layer Nickel Plating on Aluminum Alloy

作　　者：曹瑞 向可友 高荣龙 刘慧丛[3] 朱立群[3] CAO Rui;XIANG Keyou;GAO Ronglong;LIU Huicong;ZHU Liqun(China Aerospace Components Engineering Center,China Academy of Space Technology,Beijing 100094,China;Zhuhai Maste Hardware Plastic Products Co.,Ltd.,Zhuhai 519175,China;School of Materials Science and Engineering,Beihang University,Beijing 100191,China)

机构地区：[1]中国空间技术研究院宇航物质保障事业部,北京100094 [2]珠海市玛斯特五金塑胶制品有限公司,广东珠海519175 [3]北京航空航天大学材料学院,北京100191

出　　处：《电镀与精饰》2022年第9期57-62,共6页Plating & Finishing

摘　　要：针对电连接器的铝合金壳体在海洋环境下易发生腐蚀,需要制备防护镀层以具备良好屏蔽、导电与耐腐蚀性能的需求。本文以连接器壳体常用的2A12铝合金为基材,选择由含磷9 wt.%~13 wt.%的化学镀镍磷合金层为底层防护层(厚为16~18μm)、电镀光亮镍层为面层(厚度在6~8μm)组成的双层防护结构,考察其在3.5 wt.%氯化钠溶液中的电化学腐蚀行为。结果表明:该镀层厚度组合的样品经过816 h的中性盐雾腐蚀实验,铝合金壳体上的双层镀镍表面没有出现腐蚀点,表现出良好的耐腐蚀性能,而双层组合镀镍层中任一层遭受到破坏其完整性的机械损伤时,均会严重降低组合镀镍层的耐腐蚀性能。The aluminum alloy shell of electrical connector is prone to corrosion in marine environment,so it is necessary to prepare protective coating to have good shielding effect,electrical conductivity and corrosion resistance. In this paper,2A12 aluminum alloy commonly used in connector shell is used as the base material,and the electroless nickel phosphorus alloy layer containing 9 wt.%-13 wt.%phosphorus is selected as the bottom protective layer with a thickness of 16-18 μm,while the bright nickel plating layer is selected as the surface layer with a thickness of 6-8 μm. Its electrochemical corrosion behavior in 3.5 wt.% sodium chloride solution was investigated. The experimental results show that after 816 hours of neutral salt spray corrosion test,the double-layer nickel plating surface on the aluminum alloy shell has no corrosion spots and shows good corrosion resistance. When any layer of the double-layer composite nickel plating suffers mechanical damage that destroys its integrity,the corrosion resistance of the composite nickel plating layer will be seriously reduced.

关 键 词：铝合金镀镍 电连接器 化学镀镍磷底层 电镀光亮镀镍表层 耐腐蚀性能 

分 类 号：TQ153.1[化学工程—电化学工业]