铬钝化和出光是工件镀锌后光亮处理中的一个工序,钝化出光溶液中硝酸的含量又影响光亮处理的质量。我们根据文献介绍的光度法并采用相应的空白抵消铬的影响;在显色液中加入乙醇,防止大量铁(Ⅲ)、铬(Ⅲ)等离子的硫酸盐析出,获得了满意的结果。 Chromium passivation and the light is the workpiece after galvanizing a bright process, the passivation of the solution of nitric acid content also affects the quality of light treatment. We counteract the effects of chromium according to the photometric method introduced in the literature and using the corresponding blank; and ethanol was added to the color developing solution to prevent sulfate precipitation of a large amount of iron (III) and chromium (III) ions. The satisfactory results were obtained.