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What To Do If The Galvanized Steel Is Rusty?

Dec. 12, 2019

Galvanized Steel Sheet is to prevent the surface of the steel sheet from corrosion and prolong its service life. The surface of the steel sheet is coated with a layer of metal zinc. This zinc-coated thin steel sheet is called galvanized sheet.


Classification and use of galvanized sheet:


According to production and processing methods can be divided into the following categories:

1. Hot Dipped Galvanized Steel Sheet. The steel sheet is immersed in a molten zinc bath, and a layer of zinc steel sheet is adhered to the surface. At present, it is mainly produced by continuous galvanizing process, that is, the coiled steel sheet is continuously immersed in a zinc plating bath with molten zinc to make a galvanized steel sheet;

2. Galvanized steel sheet. This steel sheet is also manufactured by the hot-dip method, but immediately after it is out of the tank, it is heated to about 500 ° C to form an alloy coating of zinc and iron. This galvanized sheet has good paint adhesion and weldability;

3. Galvanized steel sheet. The galvanized steel sheet produced by electroplating has good workability. But the coating is thin, and the corrosion resistance is not as good as the hot-dip galvanized sheet;

4. Single-sided and double-sided differential galvanized steel. Single-sided galvanized steel, that is, products with only one side galvanized. In welding, painting, anti-rust treatment, processing, etc., it has better adaptability than double-sided galvanized sheet. In order to overcome the shortcomings of uncoated zinc on one side, there is another type of galvanized sheet coated with a thin layer of zinc on the other side, that is, a double-sided differential galvanized sheet;

5. Alloy and composite galvanized steel sheet. It is made of zinc and other metals such as lead, zinc, and even plated steel. This steel plate has both excellent anti-rust performance and good coating performance.


Hot Dipped Galvanized Steel Sheet


Hot Dipped Galvanized Steel Sheet


In addition to the above five types, there are color galvanized steel sheets, printed coated galvanized steel sheets, and polyvinyl chloride laminated galvanized steel sheets. But currently the most commonly used is hot-dip galvanized sheet.


There are two possible reasons for the galvanized sheet to rust through long-term theoretical analysis: First, the quality of the galvanized sheet is not high enough, such as missing points and bubbles. The second is external corrosion, such as being wet by acid rain. The third is improper storage method. If it is used in a relatively humid place, it will rust quickly. These three types may be analyzed theoretically. Therefore, the rust prevention of the galvanized sheet should be done properly.


What should I do when the galvanized sheet is rusted? Don't worry, Galvanized Steel Sheet Manufacturer tells you:


Washed with concentrated sulfuric acid, concentrated sulfuric acid can remove rust, but when encountering iron, he will not corrode iron, and the surface of iron will be passivated. Wash the concentrated sulfuric acid and dry it. If necessary, re-galvanize, otherwise the iron will corrode faster. If it doesn't work, first apply red anti-rust paint, one color with Fe2O3, the main component is also Fe2O3, which can prevent rust, but it must be brushed well and denser, and after drying, apply your favorite paint. To put it simply, it is to first polish and rust, re-galvanize, and spray anti-rust paint if not.

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