Galvanized steel pipe can be divided into the cold galvanized pipe, galvanized pipe.
Galvanized pipe is to make the molten metal and the body reaction, iron-based alloy layer, so that the substrate and coating combination of both. Hot dip galvanized steel pickling is the first, in order to remove the steel surface of iron oxide, pickling, the aqueous solution by ammonium chloride or zinc chloride or ammonium chloride and zinc chloride mixed solution tank cleaning, and then send into the hot-dip plating bath. Hot-dip galvanized with coating uniformity, adhesion, and long life. Hot dip galvanized steel substrate occurs with molten bath complex physical, chemical anti-galvanized steel pipe should form a corrosion-resistant structure of zinc-iron alloy layer close. Alloy layer and the layer of pure zinc, steel base blend. Therefore, its corrosion resistance ability.
Cold galvanized pipe is galvanized, galvanized rarely, and only 10-50g/m2, its own hot dip galvanized pipe corrosion resistance than a lot of difference. Regular galvanized pipe manufacturers, in order to ensure quality, most do not use electro-galvanized (cold plating).
We often say that the galvanized pipe, galvanized pipe use now gas, heating with the kind of iron pipe is galvanized pipe, galvanized pipe as the pipe, use a few years later, the tube produces a lot of rust, yellow water outflow ware not only pollution, but not mixed with smooth walls breeding of bacteria, heavy metals in the water caused by excessive corrosion, serious harm to human health. The sixties and seventies, developed countries started to develop a new international pipe, galvanized pipe and another disabled. Chinese Ministry of Construction and other four ministries have issued a document clearly disabled from 2000 onwards galvanized pipe, now the new district has been rarely used cold water pipe galvanized pipe, but some communities still use the hot water pipe is galvanized pipe. For safety and health there are some security risks!
Painted galvanized pipe, you must use professional equipment to complete the steps required to process includes the following steps: passivation step, cleaning step; coating step; curing step, the paint has dried before preheating step procedure, and bake interfere with heat treated coating temperature of the curing temperature of ¡À 20 ¡æ. The device is known in public facilities, based on the dipping trough with dry warm oven. Technology and equipment of the invention can not only large quantities of continuous production of galvanized pipe painted, and painted to ensure quality, surface can not afford to bubbles, can not afford to orange peel, efficiency can be increased two or three times, so that appearance look more beautiful!