what is hot dipped galvanized?

Hot dip galvanizing is a corrosion protection process that involves immersing steel into molten zinc solution, allowing a layer of zinc to adhere to its surface. The electrochemical properties of zinc result in a zinc layer about 30 microns thick on the surface of steel, which can effectively prevent corrosion of steel in harsh environments such as moisture, acidity, and alkalinity.

1、 The basic principle of hot-dip galvanizing
Hot dip galvanizing is a corrosion protection process that involves immersing steel into molten zinc solution, allowing a layer of zinc to adhere to its surface. The electrochemical properties of zinc result in a zinc layer about 30 microns thick on the surface of steel, which can effectively prevent corrosion of steel in harsh environments such as moisture, acidity, and alkalinity.
2、 Hot dip galvanizing process flow
1. Steel surface treatment: First, it is necessary to clean and acid wash the steel surface to remove impurities such as oil stains and rust, in preparation for the next step of work.

2. Pre treatment: Forming a layer of zinc iron alloy on the surface of the steel can increase the adhesion between the steel surface and the zinc liquid, thereby improving the adhesion of the zinc layer.

3. Refining treatment: Refining the zinc solution to remove impurities and impurities, and improve the quality of the zinc plating solution.
4. Hot dip galvanizing: Immerse pre treated and refined steel into molten zinc solution to attach a layer of zinc on its surface.

5. Post treatment: Post treatment is carried out on the surface of hot-dip galvanized steel, mainly including leaching and slag removal, to ensure the quality and uniformity of the galvanized layer.
3、 Advantages and disadvantages of hot-dip galvanizing processing technology
1. Advantages:
a. The galvanized layer has a high density and is tightly bonded to the surface of the steel, which can effectively prevent corrosion of the steel in humid, acidic, alkaline and other environments, and extend its service life.
b. The thickness of the galvanized layer is controllable, and different layer thicknesses can be processed according to the needs of different usage environments.
c. Hot dip galvanizing technology is mature, processing equipment is simple and easy to use, and production costs are low.
2. Disadvantages:
a. The thickness of the galvanized layer is not easy to control uniformly, and it is easy to produce local over thickness or over thin situations during the processing.
b. The galvanized layer can corrode in special environments such as high temperature, strong acid, and strong alkali, leading to a decrease in the anti-corrosion performance of the steel.
4、 Application fields of hot-dip galvanizing
Hot dip galvanizing technology is widely used in fields such as construction, transportation, and mechanical processing. For example, highway guardrails, bridge steel structures, automobiles, ships, etc. all use hot-dip galvanizing technology to improve the corrosion resistance of steel and extend its service life.
In short, hot-dip galvanizing process is an effective anti-corrosion process for steel, which can improve the service life and safety performance of steel. It has a wide range of applications and high economic and social benefits.