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为了改善INCO法不锈钢着色工艺铬酸含量高、对环境污染重的现状,采用铬酸-硫酸-磷酸体系,加入过渡金属无机盐,成功研究了一种低铬酸不锈钢着色技术。探讨了主要成分、添加剂和操作务件对着色膜质量的影响,获得了如下较好的工艺条件:铬酸酐80~90g/L,浓硫酸200~220mL/L,磷酸40~60 mL/L,硫酸锰30~40 g/L,硫酸锌5~10 g/L,硝酸钠10~20 g/L,光亮剂HNX-A 5~10 g/L,温度80~90°C,时间8~25 min。在上述工艺下,随着着色时间的延长,所形成的着色膜颜色按茶色、金色、蓝绿、黑色、紫红、鲜绿而变化:控制一定的时间和温度,可获得色泽均匀、鲜艳的着色膜,其装饰效果可与INCO法媲美。该方法制备的着色膜具有良好的耐磨性和耐热性,且工艺操作简便,着色膜颜色重现性好,着色液中铬酸浓度低,只有通用INCO法的1/3,有利于保护环境,降低废水处理成本,具有较高的应用价值。
In order to improve the stainless steel coloring technology of INCO method, the chromic acid content of stainless steel is high, and heavy pollution of the environment is present, a chromic acid-sulfuric acid-phosphoric acid system is added and a transition metal inorganic salt is added to successfully study a low chromic acid stainless steel coloring technique. The effects of main components, additives and handling components on the quality of colored films were discussed. The optimum technological conditions were as follows: chromic anhydride 80 ~ 90g / L, concentrated sulfuric acid 200 ~ 220mL / L, phosphoric acid 40 ~ 60mL / Manganese sulfate 30-40 g / L, zinc sulfate 5-10 g / L, sodium nitrate 10-20 g / L, brightener HNX-A 5-10 g / L, temperature 80-90 ° C, time 8-25 min. Under the above process, as the coloring time is extended, the color of the formed color film changes according to the color of brown, gold, blue-green, black, purple and fresh green: controlling the time and temperature can obtain uniform color and vivid coloring Film, its decorative effect comparable with INCO law. The coloring film prepared by the method has good abrasion resistance and heat resistance, and the process operation is simple and the color reproducibility of the coloring film is good. The chromic acid concentration in the coloring liquid is low, only 1/3 of the common INCO method is favorable for protection Environment, reduce wastewater treatment costs, with high application value.