[China Aluminum Network] Aluminum in zinc liquid is added as a beneficial element. For general galvanized products and iron-plated zinc alloy products, aluminum is added as an alloying element for improving performance, and for aluminum galvanizing and In the case of galvanized aluminum products, aluminum is an important part of the coating, so aluminum has a greater role. The following only describes the effects of aluminum when galvanized and iron-zinc alloy products.
(1) The effect of aluminum on the galvanizing process has two aspects. First, aluminum inhibits the reaction between iron and zinc. After the steel strip enters the zinc solution, the aluminum first reacts with iron to form a dense layer of iron-aluminum compound, which suppresses the iron. The diffusion, so that the formation and thickening of the iron zinc compound layer is hindered. The second is that aluminum is conducive to the removal of zinc slag. This is also because aluminum is more active than iron. Aluminum can replace the iron in zinc slag to form aluminum zinc compounds and float off.
(2) The role of aluminum in galvanized products also has two aspects: First, aluminum improves the adhesion of the coating, and the iron-aluminum compound layer can play the role of the media, so that the steel base and the plating are tightly integrated, and thus can be improved. The galvanized sheet stamping performance does not cause the coating to fall off during deformation. Second, aluminum can improve the uniformity of the galvanized sheet, aluminum will make the coating less affected by the iron and zinc reaction, the coating thickness is uniform, and at the same time improve the appearance of the galvanized product.
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