HG/T 2-1049-1977 "Electrophoresis lacquer warehouse efficiency determination method" stipulates the determination method of electrophoresis lacquer coulometric efficiency, with Dry-Film weight (mg/C) deposited per unit of electricity as the measurement unit. The standard is issued by the Ministry of Chemical Industry of the People's Republic of China and is applicable to the evaluation of the efficiency of Electrophoresis lacquer warehouse. The instruments required for the experiment include tinplate, scale and coulometer to ensure the accuracy of measurement.