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Advantages and disadvantages of hot dip galvanized cold dip galvanized products

Views: 4     Author: Ada Ru     Publish Time: 2021-10-27      Origin: Site

Galvanized refers to the surface treatment technology of plating a layer of zinc on the surface of metal, alloy or other materials in order to play the role of beauty and rust prevention.  The main application is hot dip galvanizing and cold galvanizing




1. The principle is different

Hot-dip galvanizing: The principle is to immerse steel devices in molten zinc to obtain a metal coating.

Cold galvanizing: The principle is to put the processed steel devices into a solution of zinc salt after degreasing and pickling, and after connecting the electrolytic equipment, use the electrochemical principle to deposit a layer of zinc on the steel devices.

2. the required equipment is different

Hot-dip galvanizing: pickling equipment, bottom-drawing annealing furnace or bell-type annealing furnace.

Cold galvanizing: electrolysis equipment.

3. performance and advantages are different

Hot-dip galvanizing: long-lasting and anti-corrosion. The standard quality of hot-dip galvanizing and rust-proof thickness makes it have excellent durability; the toughness of the coating is strong, and the hot-dip galvanizing layer forms a unique smelted metal structure. The structure can withstand mechanical damage during transportation and use.

Cold galvanizing: has excellent environmental performance. Most cold galvanizing solvents and thinners do not contain toxic organic solvents, and the cold galvanizing process also reduces the volatilization of organic solvents, reduces drying energy consumption, and is beneficial to environmental protection.

4. different applications

Hot-dip galvanizing: Due to its good anti-corrosion performance, hot-dip galvanizing is widely used in power towers, communication towers, railways, highway protection, street light poles, marine components, building steel structural components, substation ancillary facilities, light industry, etc.

Cold galvanizing: Cold galvanizing is the main development direction of environmental protection of heavy-duty anticorrosive coatings.

Hot-dip galvanizing is generally thicker and has better physical protection; electro-galvanizing is generally thin, but due to metal replacement, electrochemical protection of high-potential substances is formed on the surface of the substrate.

The thickness of the electro-galvanized layer is usually 5-15μm, while the hot-dip galvanized layer is generally above 35μm, even as high as 200μm. Hot-dip galvanizing has good coverage, dense coating and no organic inclusions. The cold galvanizing process is used to protect metals from corrosion. For this purpose, zinc filler coatings are used, which are coated on the protected surface by any coating method. After drying, a zinc filler coating is formed. In the dry coating With content of zinc (up to 95%). Steel is galvanized on the surface under cooling conditions, while hot-dip galvanizing is a steel pipe galvanizing the surface under hot dipping conditions. It has strong adhesion and is not easy to fall off.

Hot-dip galvanizing is the main method used for galvanizing the surface of steel sheets. Hot-dip galvanizingis also called hot-dip galvanizing and hot-dip galvanizing: it is an effective metal anti-corrosion method, mainly used in metal structure facilities in various industries. The rust-removed steel parts are immersed in a molten zinc solution at about 500°C, so that a zinc layer is attached to the surface of the steel parts, thereby achieving the purpose of anti-corrosion. Hot-dip galvanizing process: finished product pickling-washing-adding plating solution-drying-rack plating-cooling-chemical treatment-cleaning-polishing-hot-dip galvanizing completed. Hot-dip galvanizing is developed from the older hot-dip method. Since France applied hot-dip galvanizing to industry in 1836, it has a history of more than 170 years. In the past 30 years, with the rapid development of cold-rolled strip steel, the hot-dip galvanizing industry has developed on a large scale.

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