一、前言怎样防止镀银变色的问题是目前表面防护专业中,大家所共同关心的一个问题。北京市机械工程学会表面防护组一九六四年年会上,有些单位针对这一问题发表了几篇试验研究报告,分别提出了电解钝化、镀铍处理和浸有机涂层等防止银层变色的方法,但这些报告中对各种处理方法的试验结果和评价很不一致。为了得到比较一致的结论,便于推广,该会决定由北京市各有关单位按照本单位的工艺条件制备一批规格统一的样板 First, the preface How to prevent the problem of silver discoloration is the current surface protection professionals, we all share a common concern. Beijing Institute of Mechanical Engineering surface protection group 1964 annual meeting, some units for this issue published several experimental study, respectively, proposed electrolytic passivation, beryllium plating and organic coating to prevent the silver layer Discoloration method, but the test results and evaluation of various treatment methods in these reports are very inconsistent. In order to get more consistent conclusion, easy to promote, the decision by the Beijing municipal units in accordance with the conditions of the unit prepared a number of uniform specifications of the model