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我厂是生产多年常规武器的专业工厂,机匣是枪上的主件,是由2个部件点焊方法结合而成。经热处理淬火后,一直采用阴极电化学腐蚀法,在防止渗氢及生产中的防腐均达到了产品性能要求。自一九八四年七月份转产后,把原来的电解侵蚀法改为一般化学浸蚀法,当时的理由认为由原40Cr钢改用了40~＃钢。结果在加工过程中结合焊缝处出现严重冒盐现象,个别件表面产生腐蚀深坑,以至造成部份返修、报废。经多次分析原因为:(1)机匣结合经热处理后,焊缝处渗进大量的硝盐物质,此盐类物质是强腐蚀剂,虽经热水煮沸20分钟,但渗进之盐不易清除干净。经破坏性试验,存在着强碱性物质。
Our factory is specialized in the production of many years of conventional weapons factory, the receiver is the main gun, is a combination of two parts by spot welding. After heat treatment quenching, has been using cathodic electrochemical etching method, to prevent hydrogen permeation and corrosion in the production have reached the product performance requirements. Since the conversion started in July 1984, the original electrolytic etching method was changed to the general chemical etching method. At that time, the reason was that the original 40Cr steel was converted to 40 ~ # steel. As a result, serious salt-capping phenomenon occurred in the weld area during the processing. Deep corrosion occurred on the surface of individual pieces, causing partial rework and scrap. After many analysis for the reasons: (1) After the combination of the receiver after heat treatment, the weld penetration of a large number of nitrate salt material, the salt is a strong corrosive, although heated by boiling for 20 minutes, but the infiltration of the salt is not easy Clean Destructive testing, there is a strong alkaline material.