This standard specifies the test method for determining the mass (weight) of the zinc coating per unit area on steel products using the gravimetric method (i.e., the stripping dissolution method). The core principle is: accurately weighing the mass of the specimen before and after removing the zinc coating, and calculating the mass of the zinc coating per unit area (typically expressed in grams per square meter) based on the surface area and weight loss. The standard details the equipment and materials required for the test, such as an analytical balance (for precise weighing), chemical reagents (e.g., hydrochloric acid of specific concentration or antimony inhibitors), a drying oven, etc., as well as the procedures for preparing, handling, and calculating the samples. This method serves as one of the benchmark tests for quality control and acceptance of electroplated products, particularly for evaluating the thickness and uniformity of zinc coatings on steel surfaces.