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The difference between hot-dip galvanizing and cold-galvanizing

Aug. 08, 2019

The difference between hot-dip galvanizing and cold-galvanizing shared by Galvanized Wire supplier.

Galvanized wire features: galvanized wire has good toughness and elasticity, high zinc content can reach 300 grams/square meter. With thick galvanized layer, corrosion resistance and other characteristics. Hot dip galvanizing. Cooling and other processes from the processing. Galvanized iron wire application: products are generally used for construction, handicrafts, the preparation of wire mesh, highway fence, product packaging and daily civilian and other categories. Galvanized iron wire is divided into hot dip galvanized wire and cold galvanized wire (galvanized wire).

The difference is: hot dip galvanizing is in the heat ablation of zinc liquid dip plating, production speed, coating thickness but not average, the market permits the thickness of 45 microns, up to 300 microns. Dark color, consumption of zinc metal, and the base metal caused by infiltration layer, corrosion resistance, outdoor environment can be maintained for decades. Galvanized wire cold galvanized (galvanizing) is in the electroplating bath through the current unidirectional zinc gradually plating on the metal surface, production speed is slow, coating average, thickness is relatively thin, usually as long as 3-15 microns, bright appearance, corrosion resistance, a few months will be corrosion.

Hot Dipped Galvanized Steel Wire

Hot Dip Galvanized Wire

Hot dipped galvanized wire mesh as a way of metal corrosion protection, it is usually the steel structure to be derusted into the zinc solution of about 500℃, let the zinc layer on the surface of the steel structure. Cold galvanized through the electrolysis of metal and other materials to adhere to the surface of a layer of metal film, make the material surface texture uniform, anti-corrosion wear resistance, appearance more beautiful.

Hot dip galvanized coating is thicker, generally 30-60 micron, coating corrosion resistance is higher. Suitable for outdoor work of steel parts, such as highway fences, power towers, large size fasteners and other relatively "rough" workpiece rust prevention. Cold galvanized, the surface of the workpiece is smooth and smooth, but because the coating is relatively thin, generally within 5-30 microns, so the corrosion protection time will be relatively short. All used in the indoor use of rustproof parts, such as chassis bottom, panel, small size fasteners, etc.

Through the principle of zinc resistance to atmospheric corrosion, hot-dip galvanized steel and other materials for electrochemical protection, the surface of zinc carbonate protective film can slow down the rate of zinc corrosion, even if damaged, will form a zinc film. Cold galvanizing is the use of chemical method, zinc alloy separated into zinc ions, has attached to the surface of steel, this way to form a new layer is generally thin, steel in general, prone to corrosion.

The outer surface of cold galvanized steel is smooth and bright. The electroplating layer of the colored passivation process will appear yellow-green, and the electroplating layer of the white passivation process will appear blue-white. Generally, there is only a small amount of zinc layer at both ends of the cold galvanized steel pipe, and then there is no galvanized layer in the inside. Outside surface of hot dip galvanization is coarser, color is darker, present silver-white commonly, because make working procedure, caused the surface produced a few water grain and drop a bump, the surface is not luminous, also won't glance. Hot dip galvanized steel pipe has a complete galvanized layer inside and outside.

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