钛合金上可焊性镍-金复合镀层的制备及表征  

Preparation and characterization of solderable nickel–gold composite coating on titanium alloy

作　　者：王从香[1] 牛通[1] 

机构地区：[1]南京电子技术研究所,江苏南京210039

出　　处：《电镀与涂饰》2013年第2期13-16,共4页Electroplating & Finishing

摘　　要：介绍了一种在TC4钛合金上获得可焊性镀层的工艺,其流程主要包括除油、酸蚀、活化、电镀氨基磺酸镍、镀纳米薄金、热处理和电镀金。讨论了TC4钛合金前处理和热处理工艺对镀层性能的影响。对前处理过程中钛合金表面形貌的变化以及各镀层的表面形貌和元素组成进行了表征。所得Ni–Au复合镀层结合力良好,经350°C×30min的热震试验后无鼓泡、开裂,一次合格率达到95%。复合镀层与Sn37Pb焊料的润湿性良好,焊透率达98%。该工艺解决了TC4钛合金材料可焊性镀层批量镀覆的技术难题。A process for forming a solderable nickel–gold composite coating on TC4 titanium alloy was introduced, which mainly includes degreasing, pickling, activating, sulfamate nickel plating, nanometer-thick gold plating, heat treatment, and gold plating. The effects of pretreatment and heat treatment on the properties of the composite coating were discussed. The morphological change of Ti alloy surface and the surface morphology and elemental composition of individual coating were characterized. The composite coating has good adhesion after thermal shock test at 350 ℃for 30 min without any bubble or crack. The one-time qualification rate of the product reached 95%. The composite coating has good wettability with Sn37Pb and the penetration rate is up to 98%. The problem of large-scale production for solderable coating on titanium alloy was solved.

关 键 词：钛合金 可焊性镀层 镍 金 电镀 活化 热处理 焊透率 

分 类 号：TQ153.12[化学工程—电化学工业] TQ153.18