我厂231化油器上有个怠速空气调节螺钉,尺寸约为M5×27。为提高耐蚀能力,设计要求软氮化+镀锌。几年来从实践中感到,凡是经过软氮化的工件再镀锌非常困难,须经较长时间的酸洗和滚镀,使工件氮化层基本被酸洗掉,否则是很难镀上的。有一次因为镀不上,多次酸洗和滚镀,使一批工件报废。 I plant 231 carburetor has an idle air conditioning screw size of about M5 × 27. To improve the corrosion resistance, the design requirements of soft nitride + galvanized. Over the past few years from the practice felt that any work after the nitrocarburized galvanized and then very difficult to go through a long period of pickling and barrel plating, the workpiece nitride layer is basically pickled, otherwise it is difficult to plating . Once because the plating is not on, repeatedly pickling and barrel plating, so that a number of scrapped.