Electrogalvanizing is to obtain a coating by means of electrodeposition by applying an external power source, and the obtained coating is composed of fine pure zinc grains. Cold galvanizing (or electrogalvanizing) is zinc plated at room temperature by electroplating or other methods. Theoretically, a zinc layer of any thickness can be obtained by electrogalvanizing. The amount of zinc on the current practical electro-galvanizing can reach 1200g/m2. Generally, the amount of zinc on the electro-galvanized layer can also reach 750g/m2.
Hot-dip galvanizing relies on physical thermal diffusion to form a coating. First, an iron-zinc compound is formed, and then a pure zinc layer is formed on the surface of the iron-zinc compound. The high value of zinc on hot-dip galvanizing is only 593g/m2. Hot-dip galvanizing will reduce the mechanical properties of the steel wire. Galvanized steel wire ropes with high strength and high corrosion resistance are required to be twisted by electro-galvanized steel wires. Hot-dip galvanizing is zinc plated in a molten zinc solution of 450-480 degrees.
hot-dip galvanized steel wire rope and cold-dip galvanized steel wire rope is that the zinc layer of hot-dip galvanized steel has better corrosion resistance than cold-galvanized steel due to the zinc-iron alloy layer. The surface state of the hot-dip galvanized steel wire rope is a little black because of the hot-dip galvanized zinc-iron alloy. However, there is no chemical reaction on the electroplating surface, so it is still the natural color of zinc, which looks brighter. Under normal circumstances, the zinc layer of hot-dip galvanizing is thicker and the corrosion resistance is better. The zinc layer of electro-galvanizing is thinner and the corrosion resistance is poorer.
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