The vast majority of stainless steel products require good corrosion resistance, such as one or two types of tableware, kitchenware, water heaters, drinking fountains, etc., some foreign businessmen also do corrosion resistance tests on products: warm to boiling with NACL solution, dump the solution after a period of time, wash and dry, and call the weight loss to determine the degree of corrosion (Note: when polishing products, Because the emery cloth or sandpaper contains Fe components, it will lead to rust spots on the surface of the test.