不锈钢碱性化学发黑诸震鸣（苏州医疗器械厂，２１５００５）一些表面处理厂家采用“因科法”，即在硫酸、铬酐组成的溶液中，不锈钢件在高温条件下氧化发黑。当然，采用此法生产效率较高，但弊病却显得比“优点”更为明显。首先，此法要用到高浓度的铬酸（或重铬酸钾），... Stainless steel Alkaline chemical black Zhu Zhenming (Suzhou Medical Equipment Factory, 215005) Some surface treatment manufacturers use “due to Ko”, that is, sulfuric acid, chromic anhydride solution, stainless steel parts in high temperature oxidation black oxide. Of course, the production of this method is more efficient, but the disadvantages appear to be more obvious than the “advantages.” First, this method to use high concentrations of chromic acid (or potassium dichromate), ...