Hot dipped galvanized steel pipe is in manufacturing process using steel pipes of removed rust dipped into zinc liquid of 500℃ temperatures, and making steel surface attached zinc layer so as to achieve the purpose of anti-corrosion.
Galvanized steel pipe is the carbon steel pipe that are coated with a protective layer of zinc. The zinc layer served as a sacrificial layer, it will get rust before the carbon steel under neath it. Galvanized steel pipe include Two types: hot dipped galvanized steel pipe and cold galvanized steel pipe. Galvanized layer will strengthen the anti-corrosion performances of steel pipe.
Why use zinc? Because of zinc element is active than steel element. On one hand, zinc oxide of galvanized steel pipe surface is compact, it can stop oxidation(corrosion). On the other hand, when electric-chemical corrosion has occurred, the first kind of metal corrupted is zinc rather than steel. The zinc layer effect is stop corrosion speed, and prolong the life of steel pipe.
Galvanized steel pipe mainly used in transmission of coal gas, steam. It was used as water pipe, but after several years past, there were many rust in the pipe, and water get yellow color for carrying iron oxide. The water not only polluted dishes or other sanitary ware, but also carrying bacteria produced in the internal surface which not smooth . As a result of the corrosion, the water contains heavy metal element is too much and is harmful to people’s health. For this reason, developed countries gradually banned it using as water pipe since 1960s.
Hot dipped galvanized steel pipe is in manufacturing process using steel pipes of removed rust dipped into zinc liquid of 500℃ temperatures, and making steel surface attached zinc layer so as to achieve the purpose of anti-corrosion.
Hot galvanizing is a kind of effective anti-corrosive treatment, used in kinds of steel structural products. Since 1836 France used hot galvanizing in industry the first time, it have been more than 180 years. However following by the development of cold rolled steel, it has greatly developed in recent decades. With the high-voltage transmission, transportation, communications, the protection products require higher standards, hot galvanizing demand is also increasing.
