The ASTM D3322-23 standard specifies the procedure selection and method of use for testing primers and primer surface treatments on prefabricated metals. The standard applies to a variety of primers and primer surface treatments and is designed to evaluate their adhesion, abrasion resistance, corrosion resistance and compatibility with subsequent coatings on different metal substrates. The test procedure includes coating thickness measurement, drying treatment, physical property testing (e.g. adhesion, abrasion resistance, chemical durability, etc.), and specific test items are selected according to the agreement between the manufacturer and the user. The standard provides a uniform test benchmark for coating research and development, quality control and engineering applications, ensuring that the performance of primers in actual use is as expected.