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氯化钾溶液镀锌不仅镀层光亮,结晶细致,利于低铬钝化,而且镀液分散能力和深度能力强,沉积速度快。但是,若工艺条件控制不当,镀锌产品会出现变色、生锈等质量问题。本文讨论影响氯化钾镀锌层耐蚀性的若干因素。一、镀锌层自身的耐蚀性 1、镀锌前处理工艺的影响: 合理的工艺流程是获得具有良好耐蚀性锌层的基础。我们原用的前处理工艺为:强腐蚀(?)电化学除油(?)弱腐蚀→镀锌。由于强腐蚀前未经化学除油,使镀件表面仍有许多锈斑,影响了锌的电沉积,并降低镀锌层与金属基体的结合力。为此改为:化学
Galvanized potassium chloride solution is not only bright coating, crystal detail, conducive to low-chromium passivation, and bath dispersion ability and depth ability, deposition speed. However, if the process conditions are not properly controlled, galvanized products will appear discoloration, rust and other quality problems. This article discusses several factors that affect the corrosion resistance of potassium chloride zinc coatings. First, the corrosion resistance of galvanized layer 1, the impact of pre-galvanized process: a reasonable process is to get a good corrosion resistance of the foundation of zinc. We used the pre-treatment process: strong corrosion (?) Electrochemical degreasing (?) Weak corrosion → galvanized. Due to the strong corrosion before chemical degreasing, the surface of the plating is still a lot of rust, affecting the electrodeposition of zinc and zinc plating and reduce the binding force of the metal matrix. To this end: Chemistry