Characteristics Of Conventional Zinc Coating Of Galvanized Products

Hot-dip pure zinc products, code is GI.

Le caratteristiche dei prodotti di zinco puro per immersione a caldo sono una bella superficie, una buona resistenza alla corrosione e una buona lavorabilità.

It is divided into two types, one is normal zinc spangles, and the other is zinc-free spangles. In the past, hot-dip galvanized products always had some zinc spangles on the surface because the lead in the zinc liquid could not be refined very pure, so our old concept is that hot-dip galvanizing has zinc spangles. With the needs of the automotive industry, if hot-dip galvanized automotive plates are to be painted, zinc spangles will have an impact on the painting. Later, by reducing the lead content in zinc ingots and zinc liquid to dozens of ppm, we can produce products with no or very little zinc spangles. For some special uses such as buildings, if you still like large zinc spangles, we can add elements such as lead or antimony to the zinc liquid to obtain large and beautiful zinc spangles.

Prodotti in lega, il suo codice è GA.

The advantage of this product is that the paint adhesion of the coating surface is particularly good, the corrosion resistance after painting is also very good, and its weldability is also very good.

But its surface morphology is gray, which is not suitable for bare use. We do not recommend it if it is not painted, because its coating contains 7-15% iron. If it is not painted, this part of iron will generate a very light red rust. Although the red rust will not expand further in terms of corrosion resistance, the appearance is not very good.

Therefore, the main use of zinc-iron alloy is still in the use occasions with painting, just like the outer panel of the car and the side panel of the refrigerator. GA products can be directly used. For refrigerator processing, it can be directly powder-sprayed without pre-treatment, and the adhesion is also very good.

Aluminum-zinc products

The characteristics are particularly good corrosion resistance and beautiful surface appearance. Its zinc flowers look like beautiful fish scales, very beautiful, and can be used directly bare.

Its corrosion resistance is 2-6 times that of our ordinary hot-dip galvanizing. Its high temperature resistance is also relatively good. It can be used at 300℃ without discoloration. If used for a short time, it also has a better color retention ability at 700℃, and has excellent heat reflection effect.

Therefore, this kind of product is now widely used in the construction and home appliance industries.