双向脉冲电源在镀银中的应用

摘要

Owing to complicated shape of tooth gear surface, the power lines are unevenly distributed everywhere in DC silver plating, causing uneven coating thickness, which will affect gear engagement. A bidirectional pulse power supply was used to silver plating and the optimum technological parameters were selected based on the comparisons in coating appearance, thickness uniformity, etc. The results show that the coating has been much improved in appearance and thickness uniformity, and the bonding strength, purity as well as hydrogen brittleness of the coating are all up to the requirements of AMS 2412.%齿轮齿型面形状复杂,直流电镀银时各处电力线分布不均,造成镀层厚度不均匀,影响齿轮啮合.采用双向脉冲电源镀银,从镀层外观、厚度均匀性等方面进行比较,优选出最佳工艺参数.结果表明:镀层在外观和厚度均匀性上有较大的改善,镀层结合力、纯度及氢脆性均符合AMS 2412的要求.