Electro-galvanizing is to obtain the coating by electrodeposition through external power supply, and the obtained coating is composed of fine and pure zinc crystal grains. Cold galvanizing (or electro-galvanizing) is zinc plated by electroplating or other methods at room temperature. Theoretically, zinc electroplating can obtain a zinc layer of any thickness. At present, the amount of zinc on the practical electro-galvanizing can reach 1200g/m2. , Generally, the amount of zinc on the electro-galvanized layer can reach 750g/m2. The difference of galvanized steel wire rope process.
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 that require high strength and high corrosion resistance are mostly twisted by electro-galvanized steel wires. Hot-dip galvanizing is zinc plated in a molten zinc bath of 450-480 degrees.
The essential difference between hot-dip galvanized steel wire rope and cold-dip galvanized steel wire rope is: Compared with cold-dip galvanizing, the hot-dip galvanized zinc layer has better corrosion resistance due to the zinc-iron alloy layer. The surface state of the hot-dip galvanized steel wire rope is blackened because of the hot-dip galvanized iron alloy. The electroplated surface has no chemical reaction, so it is still the original color of zinc and looks brighter. In general, the zinc layer of hot-dip galvanizing is thicker, and the corrosion resistance is better. The zinc layer of electro-galvanized zinc is thinner and has poorer corrosion resistance. (Unless the zinc layer of cold galvanized steel also reaches the level of thick zinc layer) The difference between the use and price of hot-dip galvanized steel wire rope and cold-galvanized steel wire rope is the question that our users care about, whether it is better to electroplated steel wire rope or hot-dipped steel wire rope ? Can not be generalized, depending on what purpose you use. For example, the support steel wire in the water pipe is better electroplated, it looks good, and the cost is low; if it is a power tower, it should be hot-dip galvanized. Because hot-dip galvanizing has good corrosion resistance, it can be used for 30 to 40 years. Although the zinc content is high on the surface, the hot-dip galvanized steel wire rope has a layer of zinc-iron alloy on the surface, and its anti-corrosion ability is much higher than that of the cold galvanized steel wire rope. At present, the market is generally electroplated steel wire ropes, because hot-dip galvanizing is expensive, and dealers have low profits from selling hot-dip galvanized steel wire ropes and sell well. However, the anti-corrosion ability of electrogalvanized steel wire ropes in the air is only a year or a half. But the anti-corrosion ability of hot-dip galvanized steel wire rope is long. In terms of appearance, the appearance of cold galvanized steel wire rope is brighter and better-looking, but the appearance of hot-dip galvanized steel wire rope is black. Therefore, all users must pay attention when purchasing galvanized steel wire rope. In fact, the anti-corrosion ability of cold galvanized steel wire rope is not as good as smooth oiling. In fact, if the price of smooth galvanized steel wire rope is 8700.00/ton as the basis, cold galvanizing will add 1000.00 tons, and hot-dip galvanizing will add 1000.00 tons on this basis. So I suggest that manufacturers and intermediaries work together to make this hot-dip galvanized steel wire rope. In fact, many users do not know this principle. As a wire rope, we should advocate energy conservation, environmental protection, and harmonious development, so that this wire rope can produce greater benefits and minimize our environment damage.