The NF A92-021-1990 standard specifies the test method for the adhesion of enamel and enamel for aluminum and aluminum alloys. The standard evaluates the durability and Stability of aluminum surface coatings by simulating the adhesion performance in the actual use environment. Adhesion test is an important means to test the bonding strength and disbonding resistance of enamel and enamel coatings under different physical conditions. Through this test, the performance Stability of coatings in long-term use can be ensured, and the coating peeling or damage due to insufficient adhesion can be avoided, thereby prolonging the service life of aluminum alloy materials. This standard applies to the quality control and testing of various types of aluminum and its alloy surface glazes and enamel coatings, and is widely used in automotive, construction and Miscellaneous industries that require high-performance surface coatings.