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一、前言镀锌产品生产中,一般都要对锌层表面进行钝化处理,以便提高锌层表面的耐蚀性能,使它对外界腐蚀介质的影响不敏感。为此,一般采用化学钝化剂(即强氧化剂)来处理锌层表面,使它生成一层耐蚀的钝化膜。武钢连续热镀锌机组上引进的西德“蒂森钝化工艺”,即采用铬酐作钝化剂来进行锌层表面处理。由于所生成的钝化膜不均匀,其耐蚀性不高(抗盐雾腐蚀寿命小于24
I. Introduction In the production of galvanized products, the surface of the zinc layer should generally be passivated so as to improve the corrosion resistance of the surface of the zinc layer and make it insensitive to the influence of the corrosive medium on the outside. To this end, the chemical passivation agent (ie, strong oxidant) is generally used to deal with the surface of zinc layer, it produces a layer of corrosion-resistant passivation film. WISCO continuous hot-dip galvanizing unit on the introduction of the West Germany “Thyssen’s passivation process”, that is, the use of chromic anhydride as passivation agents for zinc surface treatment. Due to the generated passive film is not uniform, its corrosion resistance is not high (salt spray corrosion life of less than 24