What is a galvanized pipe?

Galvanized pipes are steel pipes that have been dipped in a protective zinc coating to prevent corrosion and rust

Galvanized steel has existed for over 300 years and was used for making pipes during the nineteenth century. Galvanized steel pipes replaced the harmful lead pipes for transporting water and other fluids for domestic, commercial, and industrial uses.

Galvanized pipes are steel pipes coated with zinc to have corrosion resistance for being ideal for many applications in several sectors. The zinc coating is resistant to many other outdoor environmental elements and humidity.

Galvanized steel pipe advantages and disadvantages

One-inch galvanized pipe, 2-inch galvanized pipe, and many other sized pipes have been used for many years. It is because of their many benefits to the lead pipes used before. Dipping in zinc provides 2 galvanized pipes, galvanized square tubes, etc., with corrosion resistance, but it also has disadvantages.

While dipping in natural zinc, which has many impurities like lead, reacted with the flowing fluid elements. Hence it became a big disadvantage for 3-inch galvanized pipes, culvert pipes, galvanized water pipes, and others. But using galvanized steel coated with pure zinc does not have a disadvantage.

Hot dip galvanized pipe

The molten metal is reacted with an iron matrix to produce an alloy layer, thereby combining the substrate and the plating layer. Hot-dip galvanizing is to pickle the steel pipe first, in order to remove the iron oxide on the surface of the steel pipe, after pickling, it is washed by ammonium chloride or zinc chloride aqueous solution or a mixed aqueous solution of ammonium chloride and zinc chloride, and then fed. Hot dip plating tank. Hot-dip galvanizing has the advantages of uniform plating, strong adhesion and long service life. Most of the northern processes use galvanized strips to directly coil the zinc.

Cold galvanized pipe

Cold galvanizing is electrogalvanizing. The amount of galvanizing is very small, only 10-50g/m2, and its corrosion resistance is much worse than that of hot-dip galvanized pipes. Regular galvanized pipe manufacturers, in order to ensure quality, most do not use electro-galvanizing (cold plating). Only small companies with small equipment and old equipment use electro-galvanized steel, of course, their prices are relatively cheaper. In newly built houses, the use of cold-galvanized steel pipes as water supply pipes is prohibited.

Types of galvanized

There are a number of methods of applying zinc coatings and each will determine the coating’s thickness and its ultimate durability in a specific environments The most commonly encountered types of zinc coatings are:

  • Zinc electroplating
  • Mechanical plating
  • Continuously galvanized sheet
  • Continuously galvanized wire
  • Galvanized pipe and tube
  • General or hot dip galvanizing

The characteristics of galvanized steel pipe

Galvanized steel pipe can be found almost everywhere. Many people live in steel-framed houses, and buildings are often made with galvanized steel roofs. There are several steel parts in cars that help protect them from the weather, and it is used in many marine applications due to its ability to withstand salt and the elements. In addition to being cheap, durable and effective, this metal is also popular because it can be recycled and reused several times.

The use of galvanized steel pipes

Galvanized pipe is used in outdoor and indoor applications due to its anti rusting components. The zinc coating slows the process of corrosion and can make the pipe last for decades (in the right environment). This makes it ideal for marine applications and for transporting hot and cold water alike.

Galvanized pipe is mainly used for gas transportation, heating,. Galvanized pipe for water, oxidation of the pipe and water in the pipe turn yellow a few years later, not only contaminate the clean fit and mixed with bacteria; From heavy metals in water, which cause serious harm to the health of the human body. In the 60s and 70s, developed countries in the world began to develop new pipe materials to gradually deactivate galvanized pipe. China Ministry of Construction and four other ministries send civilization to disable galvanized pipe from the year 2000.