Hot dip galvanizing

Hot dip galvanizing is the reaction between molten metal and iron matrix to produce alloy layer, so as to combine the matrix and coating. Hot dip galvanizing is to pickle iron and steel parts first. In order to remove iron oxide on the surface of iron and steel parts, after pickling, it is cleaned in ammonium chloride or zinc chloride aqueous solution or ammonium chloride and zinc chloride mixed aqueous solution tank, and then sent to the hot dip galvanizing tank. Hot dip galvanizing has the advantages of uniform coating, strong adhesion and long service life.

The most widely used iron and steel materials in industry will be corroded to varying degrees when they are used in the environment of atmosphere, seawater, soil and building materials. According to statistics, the annual loss of steel materials due to corrosion in the world accounts for about 1 / 3 of its total output. In order to ensure the normal use of iron and steel products and prolong their service life, the anti-corrosion protection technology of iron and steel has been widely valued by people.

Hot dip galvanizing is one of the most effective means to delay the environmental corrosion of iron and steel materials. It is to immerse the cleaned and activated iron and steel products in molten zinc solution, and coat the surface of iron and steel products with zinc alloy coating with good adhesion through the reaction and diffusion between iron and zinc. Compared with other metal protection methods, the hot-dip galvanizing process has incomparable advantages in the protection characteristics of the combination of physical barrier and electrochemical protection of the coating, the bonding strength between the coating and the substrate, the compactness, durability, maintenance free and economy of the coating, and its adaptability to the shape and size of the product.