Hot Dip Galvanized, Common Surface Anticorrosion Process

There are various methods for surface treatment of products, among which hot-dip galvanizing is a commonly used anti-corrosion process. Regarding hot-dip galvanizing, what is the principle of this process? What is the process flow? What are the advantages? Welded wire mesh panels supplier to share with you:

01

The principle of hot-dip galvanizing

Hot-dip galvanizing is the reaction of molten metal with an iron substrate to produce an alloy layer, thereby combining both the substrate and the coating.

02

Hot-dip galvanizing method

Hot-dip galvanizing is to pickle the steel parts first, in order to remove the iron oxide on the surface of the steel parts, after pickling, it is carried out through the ammonium chloride or zinc chloride aqueous solution or the ammonium chloride and zinc chloride mixed aqueous solution tank Clean, and then send it to the hot-dip plating tank.

Hot Dipped Galvanized Welded Wire Mesh

03

Advantages of hot-dip galvanizing

1. The entire surface of the hot dipped galvanized welded wire mesh is protected. No matter inside the tube of the depression, or any other corner where the coating is difficult to enter, the molten zinc is easily covered evenly.

2. The hardness value of the galvanized layer is greater than that of steel. The uppermost Eta layer has a hardness of only 70 DPN, so it is susceptible to collision and concave, but the lower layer Zeta layer and delta layer have 179 and 211 DPN hardness values higher than the 159 DPN hardness value of iron material, so its impact resistance and The abrasion resistance is quite good.

3. In the corner area, the zinc layer is often thicker than other places, and has good toughness and wear resistance. The other coatings are often the thinnest, the hardest to apply, and the most vulnerable at this corner, so maintenance is often required.

4. Even if a small part of the zinc layer is peeled off due to great mechanical injury or other reasons, the iron base is exposed, at this time, the surrounding zinc layer will play the role of sacrificial anode to protect the steel here so that It is not eroded.

5. The consumption of the zinc layer in the atmosphere is very slow, about 1/17 to 1/18 of the steel corrosion rate, and is predictable.

6. The life of the coating under a specific environment mainly depends on the thickness of the coating. The thickness of the coating is determined by the thickness of the steel, that is, the thicker the steel, the easier the thicker coating. Therefore, the thick steel parts in the same steel structure must also get a thicker coating to ensure a longer life.

7. Due to beauty, art, or use in specific severe corrosive environments, the galvanized layer can be re-applied with the above paint treatment, as long as the paint system is selected correctly and the construction is easy, its corrosion prevention effect is longer than that of paint alone and hot-dip galvanizing Add up to 1.5 to 2.5 times better.

8. Use the zinc layer to protect steel. In addition to the hot-dip galvanizing method, there are several other methods. Generally, the most widely used, the best anti-corrosion effect and the best economic benefit are the hot-dip galvanizing method.