The anti-corrosion treatment of the main beam of Our cranes of Overhead crane, Gantry crane, Port crane usually adopts the following methods: 1. Spray anti-corrosion paint: First of all, clean the surface of the main beam, remove rust, oil and other impurities, and then spray anti-corrosion paint. Anti-corrosion paint can choose organic paint, inorganic paint or composite paint, according to the specific situation to choose the appropriate paint. 2. Hot dip galvanizing: the main beam is immersed in the molten zinc liquid, so that the zinc and the steel surface chemical reaction, forming a layer of zinc-iron alloy layer, so as to achieve the purpose of anti-corrosion. Hot dip galvanizing has the advantages of good corrosion resistance and long service life. 3. Spray hot-dip galvanized paint: mix hot-dip galvanized particles with organic paint and spray on the surface of the main beam to form a layer of hot-dip galvanized coating with anti-corrosion properties. Hot dip galvanizing paint has the characteristics of good anticorrosion and convenient construction. 4. Coated with anti-corrosion material: It can be coated with a layer of anti-corrosion material on the surface of the main beam, such as polyethylene film, glass fiber reinforced plastic, etc. This method is suitable for the condition that the surface of the main beam is relatively flat. It is necessary to choose the appropriate anti-corrosion treatment method.