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Hot dip galvanized tube, in order to improve the corrosion resistance of steel pipe, on general galvanized steel pipe. Galvanized steel pipe cold galvanized pipe, galvanized pipe, the former has been disabled, the latter was the state advocates can use. Hot dip galvanized pipe hot galvanizing is causes the molten metal and iron matrix inverse



galvanized pipe' Hot dip galvanized tube, in order to improve the corrosion resistance of steel pipe, on general galvanized steel pipe. 】 , in order to improve the corrosion resistance of steel tube, the general galvanized steel pipe.

galvanized steel pipe runs cold galvanized pipe' Galvanized pipe is a common pipe material in our life, the pipe material in the production process is mainly divided into two, one is another kind of cold galvanized pipe and galvanized pipe both galvanized pipe which is than earlier. 】 , hot dip galvanized Hot dip galvanized, 镀锌) Also called hot dipping zinc and hot galvanizing, is an effective way of metal corrosion, mainly used for metal structure industry facilities. 】 Tube, the former has been disabled, the latter was the state advocates can use.

galvanized pipe hot galvanizing is to make the molten metal and iron substrate reaction to produce alloy layer, so that the substrate and coating combination of both. Is hot dip galvanized steel pipes to pickling, in order to remove iron oxide on the surface of the steel tube, pickling, by ammonium chloride ( Ammonium chloride, ammonium chloride for short. 】 Or zinc chloride [ Zinc chloride is one of the important products of inorganic salt industry, its application scope is extremely broad. 】 Or ammonium chloride and zinc chloride mixed aqueous solution tank cleaning, and then placed in hot dip plating tank. Hot dip galvanized with uniform coating, strong adhesion, long service life, etc. Steel substrate with molten electrolyte solution in complex physical and chemical reaction, the formation of corrosion resistance of the structure compact zinc alloy layer. Pure zinc alloy layer and layer and steel substrate. So the corrosion resistant ability. 1, the uniformity of the galvanized layer: steel pipe sample in copper sulfate solution dipping 5 consecutive red ( Copper plating color) 2, the surface quality: the surface of galvanized steel pipe should be complete galvanized layer, can not have not plating on dark spots and bubbles exist, allow there is a little rough surface and local zinc tumor. 3, galvanized layer weight: according to buyer's request, galvanized steel pipe for weight determination of zinc layer, the average should be not less than 500 g/m2, any of these samples should not be less than 480 g/m2.

cold galvanized pipe cold galvanizing is electric galvanized, galvanized quantity are very few, only 10 to 50 g/m2, its corrosion resistance than galvanized pipe vary a lot. Normal galvanized pipe manufacturers, in order to guarantee the quality, do not use electric galvanized (mostly The cold plating) 。 Only those small, obsolete equipment, 【 The old; Out of date. 】 Small businesses use electric galvanized, of course, their price is relatively cheaper. At present, the ministry of construction has officially below, eliminating backward technology of cold galvanized pipe, the future not be allowed to use cold galvanized pipe for water and gas pipe. The zinc layer is electrodeposited coating, zinc layer and steel substrate layered independently. The zinc layer is thinner, zinc layer attached on the steel substrate, simple easy to fall off. So the poor corrosion resistance. In the new residence, it is prohibited to use cold galvanization steel tube as a feed pipe.