Hot-dip galvanized steel pipe: The hot-dip galvanized steel pipe is first pickled on the steel parts. In order to remove the iron oxide on the surface of the steel parts, after the pickling, it is passed through ammonium chloride or zinc chloride aqueous solution or ammonium chloride and zinc chloride The mixed aqueous solution tank is cleaned and then sent to the hot dip plating tank. Hot-dip galvanizing has the advantages of uniform coating, strong adhesion and long service life.

Cold galvanized steel pipe: Cold galvanized steel pipe is also called electro-galvanized steel. At present, it is rarely used on a large scale. It uses electrolysis equipment to put the pipe fittings into a solution of zinc salt after degreasing and pickling, and connect the electrolysis equipment. For the negative electrode, place a zinc plate on the opposite side of the pipe, connect it to the positive electrode of the electrolysis device and turn on the power. The directional movement of the current from the positive electrode to the negative electrode will deposit a layer of zinc on the pipe. The cold-plated pipe is processed first and then galvanized.

1. Construction technology

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Hot-dip galvanized steel pipes make the molten metal react with the iron matrix to produce an alloy layer, so that the matrix and the coating are combined, while the cold-dip galvanized steel pipe is a cold-dip galvanized coating that is mainly used for anti-corrosion by electrochemical principles.

2. Required equipment

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Hot-dip galvanized steel pipe: pickling equipment, bottom-drawing annealing furnace or bell-type annealing furnace.
Cold galvanized steel pipe: electrolysis equipment.

3. Different performance

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Hot-dip galvanizing: long-lasting and anti-corrosion, standard quality hot-dip galvanized anti-rust thickness makes it have excellent durability; the toughness of the coating is strong, the hot-dip galvanizing layer forms a unique smelting metal structure, this kind of metal 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 thickness

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The zinc layer of hot-dip galvanized steel pipe is relatively thick, with a thickness of more than 10um. Although the surface is bright, it is rough and spangles will appear. The zinc layer of electro-galvanized (cold galvanized steel pipe) is very thin. As long as the thickness is 3-5um, although the surface is smooth, it will be dark and dirty, with good processing performance and insufficient corrosion resistance.

5. Different applications

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Hot-dip galvanized steel pipes are widely used in power towers, communication towers, railways, highway protection, street lamp poles, marine components, building steel structural components, substation ancillary facilities, light industry, etc. due to their good anti-corrosion properties. Cold-galvanized steel pipe is the main development direction of the environmental protection of heavy anti-corrosion coatings.

Shenlong Pipe Manufacturing Co., Ltd. is an enterprise specializing in the production, processing and sales of various steel pipes and pipe fittings. Its production base is located in Cangzhou, Hebei. Our main products include seamless steel pipes, straight seam steel pipes, spiral pipes, galvanized steel pipes; elbows, tees, reducers, flanges, etc. Carbon steel, alloy steel, stainless steel, etc.
As a professional steel pipe manufacturer, we can provide first-class quality and professional technical services! Welcome to contact us!