钛合金化学镀镍工艺  

A process of electroless nickel plating on titanium alloy

作　　者：赵林[1] 杨中东[1] 薛向欣[1] 彭新[2] 张春刚[2] 

机构地区：[1]东北大学材料科学与冶金学院,辽宁沈阳110023 [2]沈阳黎明航空发动机集团公司,辽宁沈阳110043

出　　处：《电镀与涂饰》2006年第4期38-41,共4页Electroplating & Finishing

摘　　要：采用一种含有氢氟酸的酸性溶液作为活化溶液，对钛合金表面进行化学镀镍。讨论了活化液、络合剂、Ni^2＋及H2PO^2-浓度、缓冲剂及温度的确定。分别介绍了除膜、活化、预镀镍及化学镀镍工艺规范。对该镀镍层的耐蚀性及含磷量进行了测定，并对该镀层热处理前后的硬度、厚度、结合力、氢含量、耐磨损性及表面微观形貌进行了测试与比较。结果表明，采用本工艺可在钛合金表面沉积出70μm左右的镍磷合金镀层，磷含量在8％-11％（质量分数）；氢含量可控制在50mg/kg；经200℃热处理1h后镀层硬度达到600HV．镀层与基体结合力好；经350℃热处理1h后镀层硬度达850HV，耐磨损性良好。该镀层可满足航空钛合全部件的要求。Electroless nickel plating was carried out on titanium alloy by using a acidic solution containing hydrofluoric acid as activating solution. The determination of activation solution, complexing agent, the content of Ni^2＋ and H2PO2^-, buffering agent and temperature were discussed. The process criterion of film removing, activation, nickel pre-plating and electroless nickel plating were introduced The corrosion resistance and phosphorous content of the deposit were tested, and the hardness, thickness, adhesion, hydrogen content, wearability and surface micro-morphology of the nickel deposit before and after heat treatment were measured and compared. The results show that a nickelphosphorous alloy deposit with a thickness of around 70 μm, phosphorous content of 8% - 11% by weight and 50 mg/kg of hydrogen content can be obtained on the surface of titanium alloy. The deposit has 600 HV micro-hardness and good adhesion to substrate after heat treatment at 200 ℃ for 1 h and 850 HV microhardness and good wearability after heat treatment at 350 ℃ for 1 h. And it can meet the demands for titanium alloy parts used in aviation.

关 键 词：钛合金 化学镀绦 活化溶液 氢氟酸 氢含量 

分 类 号：TG178[金属学及工艺—金属表面处理]