To darkness color to convert the spelter or other active metal and the constituent and mannered null spelter in order to grant corrosion-resistant

摘要

Although the zinc or other active metal surface to darkness color is made to convert, at the same time corrosion-resistant characteristic is granted to that, method and the composition which are useful are disclosed. This composition ammonium chloride approximately 0.1 percent - approximately 5 percent, includes the aqueous solution which contains ammonium molybdate approximately 0.1 percent - approximately 5 percent. This composition uses the ratio of concentration of specification of ammonium chloride and the ammonium molybdate.