(1) Weathering steel: Steels with better corrosion resistance than steel for general structural use are called weathering steels. They generally contain metals such as phosphorus, copper, nickel, chromium, and titanium to form a protective layer on the surface of the metal to improve corrosion resistance.
(2) Hot dip galvanizing: Hot dip galvanizing is to immerse rust-removed steel components in zinc liquids that are melted at a high temperature of about 600° C. to make the surface of the steel components adhere to a zinc layer. The thickness of the zinc layer should not be less than 65 μm for a thickness of 5 mm or less. The board is not less than 86 μm. In order to prevent corrosion.
(3) Thermal spray aluminum (zinc) composite coating: This is a long-term anti-corrosion method with the same effect as hot-dip zinc. The specific method is to first sandblast the surface of the steel component to expose the metal luster and roughen the surface. The acetylene-oxygen flame is used to melt the aluminum (zinc) wire that is continuously fed, and is blown onto the surface of the steel member with compressed air to form a honeycomb aluminum (zinc) sprayed layer (thickness of about 80 μm to 100 μm). Finally, the pores are filled with epoxy resin or neoprene paint to form a composite coating.
(4) Coating method: The corrosion resistance of the coating method is generally inferior to the long-term anti-corrosion method and can be coated with a layer of rust preventive oil.
(5) Cathodic protection method: Adding more active metal to the surface of the steel structure replaces the corrosion of the steel. Commonly used in underwater or underground structures.
This article is edited by Zhongshan Huashi Fushun Special Steel Technology Department. Please call for more details.
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