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一、前言镀锌是钢铁零件最重要的防护性镀层之一,镀锌层耐蚀性能的提高主要依靠镀后的钝化处理。长期以来,镀锌层一直沿用铬盐钝化,但由于严重污染环境,目前受到严格限制。为了避免铬污染,国内外电镀工作者除积极应用低铬、微铬钝化外,还开展各种无铬钝化工艺的研究,如磷盐、钛盐、钼盐、钨盐以及毒性较小的三价铬盐钝化工艺等.硅酸盐钝化也是一种无铬钝化工艺,不
I. Preface Zinc plating is one of the most important protective coatings for steel parts. The improvement of corrosion resistance of galvanized steel mainly depends on the passivation treatment after plating. For a long time, galvanized coating has been used chromium passivation, but due to serious pollution of the environment, is currently subject to strict restrictions. In order to avoid chromium pollution, electroplating workers at home and abroad in addition to the active application of low chromium, micro-chromium passivation, but also to carry out a variety of chromium-free passivation process research, such as phosphate, titanium salt, molybdenum salt, tungsten salt and less toxicity Trivalent chromium salt passivation process, etc. Silicate passivation is also a chromium-free passivation process, no