1. To form alloys to change the internal structure of iron, such as adding chromium, nickel and other metals into ordinary steel to make stainless steel, greatly increasing the rust resistance of steel products.
2. Covering the surface of iron products with a protective layer is a common and important method to prevent iron products from rusting. According to the composition of the protective layer, it can be divided into the following categories:
a、 Apply mineral oil, paint or fired enamel, plastic spraying, etc. on the surface of iron products, such as carriages, buckets, etc., often apply paint; The machine is often coated with mineral oil.
b、 A layer of non rusting metals, such as zinc, tin, chromium, nickel, etc., is plated on the steel surface by electroplating, hot plating, etc. These metal surfaces can form a layer of dense oxide film to prevent iron products from rusting due to contact with water, air and other substances.
c、 A dense and stable oxide film is formed on the surface of iron products by chemical method to prevent rust of iron products.
3. Keeping the surface of iron products clean and dry is also a good way to prevent iron products from rusting.