The phosphating workpiece, according to their purpose, their quality indicators of the examination. The main quality control indicators, including the appearance of phosphate coating, phosphate coating thickness or coating weight, corrosion resistance of phosphate coating or post-processing after the three common indicators. Sometimes detected by phosphide use: the phosphating film supporting, phosphate coating hardness, friction coefficient, anti-scratch resistance, and other indicators. About the phosphide three common indicators, with reference to the following standards and methods.