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电子、电器产品要求导电良好的镀银零件,由于银与空气中的氧和硫作用,极易形成黑色的氧化银和硫化银,严重影响产品的电性能和美观。为了保证产品的质量,出厂前不得不将零件拆下来,重新镀复银层,然后再装上。为此,国内不少厂家进行去黄、黑膜和保护层的研究。黄、黑膜的去除,大都采用化学法与机械法两种方法进行。具体的作法是: A法.液体浸入法(纯化学法) H_2SO_4 20克/升化学品T·O·a 90克/升温度 40～50℃时间约5分钟 B法.固体擦拭法(化学、机械去除法) 化学品KR 300克/升化学品 TCa 100克/升化学品SA 50克/升化学品Ta 100克/升用湿坡璃丝布蘸混合物擦拭干净。上述两种方法经我们实际应用,第一种液体浸入法,黄、黑膜均可去净,但表面光泽受到损失。第二种固体擦拭法、虽操作繁琐,但质最好,擦
Electrical and electronic products require good conductive silver-plated parts, because of silver and oxygen and sulfur in the air, easily formed black silver oxide and silver sulfide, seriously affecting the electrical properties and appearance of the product. In order to ensure the quality of the product, the factory had to be removed from the factory, re-plating the silver layer, and then re-installed. To this end, many domestic manufacturers to yellow, black film and protective layer of research. Yellow, black film removal, most of the chemical and mechanical methods are used in two ways. The specific method is: A. Liquid immersion method (pure chemical method) H_2SO_4 20 g / l chemicals T · O · a 90 g / L temperature 40 ~ 50 ℃ for about 5 minutes B method. Solid wipe method (chemical, Mechanical removal method) Chemical KR 300 g / l Chemical TCa 100 g / l Chemical SA 50 g / l Chemical Ta 100 g / l Wipe the mixture with a damp glass cloth and wipe it clean. The two methods by our practical application, the first liquid immersion method, yellow, black film can go to the net, but the surface gloss loss. The second solid wipe method, although the operation cumbersome, but the best quality, rub