The main method of metal corrosion prevention is to change the internal structure of the metal. For example, adding chromium and nickel to ordinary steel to make stainless steel. Cover the metal surface with a protective layer. For example, painting, electroplating, or forming a dense corrosion-resistant oxide film on a metal surface using chemical methods. After the surface of the steel ring is coated with a metal protective layer, the oxidation damage of the metal layer will still affect the corrosion of the steel ring and cannot provide fundamental protection.