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Post-plating treatment of hot-dip galvanized wire for enhanced protection function, decoration and other special purposes (passivation, hot melting, closing and hydrogen removal, etc.). After galvanized, chromate passivation or other conversion treatment is generally required, forming the corresponding type of conversion film is one of the key processes to ensure the quality of plating. Because hot-dip galvanized wire has a long anti-corrosion life, a wide range of applications, hot-dip galvanized wire to net, rope, wire and other ways are widely used in heavy industry, light industry, agriculture, widely used in the manufacture of wire mesh, highway guardrail and construction engineering and other fields.

Good galvanized wire, plating thickness of 3- 4 mm, zinc adhesion should be less than 460 grams/m, that is, the average thickness of zinc layer is not less than 65 microns. When the thickness of plated parts is greater than 4 mm, the zinc adhesion should not be less than 610 g/m, that is, the average thickness of zinc layer should not be less than 86 microns. Standard galvanized wire coating must be uniform, galvanized layer basically uniform with copper sulfate solution test etching five times no dew iron. For standard galvanized wire coating adhesion requirements, the zinc layer of plated parts should be firmly combined with the basic metal and have enough adhesion strength, after hammer test does not fall off, not convex.

Because the coating obtained is thicker, hot-dip galvanizing has better protective performance than electric galvanizing, so it is an important protective coating for steel parts used in harsh working environment. Hot-dip galvanized products are widely used in chemical equipment, petroleum processing, Marine exploration, metal structure, electric power transmission, shipbuilding and other industries, in the agricultural field such as pesticide irrigation, greenhouse and construction industry such as water and gas transmission, wire casing, scaffolding, Bridges, highway guardrail and other aspects, has been widely used.