一、前言在汽车制造工业中广泛地采用镀锌作为零件的防护,占全部电镀零件的70～80％。因此,用无氰镀锌代替氰化镀锌具有重大的政治和经济意义。在无产阶级文化大革命以前,镀锌方面几乎全部采用氰化镀锌工艺。它排放出的废气、废水严重地污染大气、江河湖泊和土质,有害人民健康,有害环境保护。而且,氰化钠还不 First, the preface In the automobile manufacturing industry widely used galvanized as part of the protection, accounting for 70% to 80% of all electroplating parts. Therefore, cyanide-free zinc plating instead of cyanide zinc plating has great political and economic significance. Before the Great Proletarian Cultural Revolution, almost all galvanized zinc cyanide process. The exhaust gas and waste water discharged from it seriously pollute the atmosphere, rivers, lakes and soil, harm people’s health and protect the environment. Moreover, sodium cyanide is not yet