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前言磷化膜是黑色金属的最普遍的保护层之一,它广泛地应用在油漆底层上。经磷化后的制件不仅漆膜的附着力显著提高,而且提高漆膜的抗腐蚀性能。控制磷化工作液中各种成份的含量即可控制磷化膜的质量,为此就需要对磷化液中的各种成份的含量定期地进行分析。其中磷酸根的测定,本地区采用的分析方法是在缓冲溶液中加入抗坏血酸、氰化钾、氯化镁,以铬黑T为指示剂用EDTA滴定。测定过程中使用氰化钾等多种试剂,方法准确
Introduction Phosphating film is one of the most common protective layer of ferrous metal, it is widely used in paint the bottom. After phosphating the workpiece not only significantly increased the adhesion of the paint film, but also improve the corrosion resistance of the paint film. Controlling the content of various components in the phosphating solution can control the quality of the phosphating film. Therefore, it is necessary to periodically analyze the content of various components in the phosphating solution. One determination of phosphate, the method used in the region is ascorbic acid, potassium cyanide, magnesium chloride in the buffer solution, with chromium black T as an indicator with EDTA titration. Determination of the use of potassium cyanide and other reagents, the method is accurate