In daily production and use, the environment has a great impact on products, especially into the ocean and other humid environments, equipment and metal materials for a long time in this humid environment will face severe corrosion and oxidation problems.ASTM B117 is a salt spray test standard developed and published by the American Society for Testing and Materials (ASTM) Technical Committee on Standardization, and is an important test method for assessing the corrosion resistance of materials.