Difference between hot-dip galvanized fittings and electroplated fittings

(1) Hot dip galvanizing

        Hot-dip galvanizing, also called hot-dip galvanizing and hot-dip galvanizing, is an effective method of metal anti-corrosion and is mainly used in metal structural facilities in various industries. It is to immerse the rust-removed steel parts into molten zinc liquid at about 500°C, so that the zinc layer is attached to the surface of the steel components, thereby achieving the purpose of anti-corrosion. The iron parts are cleaned, then treated with solvent, dried and then immersed in zinc liquid. The iron reacts with the molten zinc to form an alloyed zinc layer.

        Hot-dip galvanizing process flow: degreasing--water washing--pickling--assisted plating--drying--hot-dip galvanizing--separation--cooling passivation.

        Advantages and disadvantages of hot-dip galvanizing: The zinc layer is thick and has strong corrosion resistance, but the price is high.

(2) Electro-galvanizing

        Electrogalvanizing, also known as cold galvanizing in the industry, is a process that uses electrolysis to form a uniform, dense, and well-bonded metal or alloy deposition layer on the surface of the workpiece. Compared with other metals, zinc is a relatively cheap and easy-to-plat metal. It is a low-value anti-corrosion electroplating layer and is widely used to protect steel parts, especially to prevent atmospheric corrosion, and for decoration. Plating technologies include tank plating (or rack plating), barrel plating (suitable for small parts), blue plating, automatic plating and continuous plating (suitable for wires and strips).

      Electrogalvanizing process flow: chemical degreasing → hot water washing → water washing → electrolytic degreasing → hot water washing → water washing → strong corrosion → water washing → electroplating of zinc-iron alloy → water washing → water washing → light emission → passivation → water washing → drying.

      Advantages and disadvantages of electro-galvanizing: The zinc layer is thin and has poor corrosion resistance, but the price is low.