Since the standard electrode potential of zinc is negative to iron, the galvanized layer in the water and moist air has the function of sacrificial anode to protect the steel base, which can greatly extend the service life of the steel. The galvanized layers commonly used in industry include hot-dip galvanizing, electrogalvanizing, mechanical galvanizing, and thermal spraying (plating) of zinc. Among them, hot-dip galvanizing accounts for about 95% of the total galvanized amount, and the amount of zinc used for hot-dip galvanizing is It accounts for 40% of zinc production worldwide and about 30% of zinc production in China.
Hot-dip galvanizing is a process technology in which steel, stainless steel, cast iron, and other metals are immersed in a molten liquid metal or alloy to obtain a coating. Hot-dip galvanizing is the most widely used and most cost-effective steel surface treatment method in the world today. Hot-dip galvanizing products play an inestimable and irreplaceable role in reducing corrosion, prolonging life, and saving energy and materials. At the same time, the coated steel is also a high-value-added short-term product supported and developed by the country.
With the implementation of the Western Development Strategy, the in-depth development of projects such as West-to-East Power Transmission, West-East Gas Transmission, South-to-North Water Diversion, Three Gorges Project, rural power grid, and urban grid secondary grid reform have made China's hot-dip galvanizing industry enter a new round of high-speed development stage.