Application of Galfan plating in batch hot-dip galvanizing

Galfan is a new type of high-efficiency plating alloy introduced by the international lead and zinc organization in the early 1980s. Its corrosion resistance is 2-3 times higher than the currently commonly used hot dip galvanizing coating, and it has the advantages of good fluidity and good post-processing performance. It has been used in continuous zinc plating, such as steel, steel plate, steel belt and other products. And there is no precedent in the field of batch hot-dip galvanization. Due to the high corrosion resistance of Galfan coatings, a large amount of zinc can be saved on the premise of ensuring the quality of products, so as to reduce the production cost of hot-dip galvanization and greatly improve the profit space of hot-dip products. Furthermore, the investment in environmental protection facilities can improve the production status of hot-dip galvanization and achieve cleaner and environment-friendly production.

Application of this technology in the field of batch hot galvanizing to improve the overall level of the industry, change the industry affected by environmental policy crackdown and the present situation of the production, to improve the competitiveness of the enterprises, and to protect the earth's resources increasingly is scarce, especially non-ferrous metal zinc, energy conservation and emissions reduction in the current national advocacy of public policy implementation is of great significance.

Hot Galfan plating process

Hot plating Galfan process is divided into two types. For continuous hot galvanizing, oxidation reduction method is adopted, such as low carbon steel wire, steel coil and steel belt. This approach is relatively simple and is outside the scope of this article. For batch galvanizing, solvent method must be adopted. Solvent method is a kind of hot galvanizing method for metal surface that has been treated before oil removal, rust removal and so on. Suitable for hot galvanizing of any kind, continuous and batch galvanizing. But the production efficiency is much lower than that of the REDOX method. And for batch hot galvanizing only use solvent method. For continuous hot plating products with required strength. High carbon also has to be dissolved. The research results of traditional special plating AIDS can also realize the single plating Galfan process of steel wire.

The process of hot-dip galvanizing Galfan by solvent method is as follows: degreasing, washing, pickling, washing, washing, special plating AIDS for Galfan, hot-dip Galfan alloy, water-cooling, passivation.

Key technical points for the above process implementation:

(1) the special GalFAn plating aid solves the problem of surface binding between GalFAn alloy and steel parts well, and avoids the phenomenon of liquid leakage.

(2) Galfan alloy was packaged in an internally heated ceramic zinc pot to solve the problem of the corrosion of Galfna alloy on the iron pot and the modification of the alloy.

Hot dip galvanizing Galfan process temperature range in 420-470 ℃, with the increase of temperature, the thickness of the coating quality and performance change.