Cleaning metal surface rust stain, is it better to weld sulphuric acid or nitric acid?
The principle of treating oxide skin with salt bath method has been introduced in the second article. When the oxide in the oxide scale of the metal surface has chemical reaction, because the expansion coefficient of the oxide layer and the metal matrix is different, the rust scale and the metal matrix can separate and fall off.
Acid etching is a chemical cleaning process to remove metal oxide and other impurities from the acid aqueous solution. As the acid and corrosion are more economical and suitable for continuous operation, it is the most effective way to remove the oxide surface of metal surface of large tonnage products. Especially cleaning iron and steel products, such as billets, ingots, steel plates, steel strips, wires, pipes and so on. Can also be used for steel forgings, casting cleaning, rust removal
Abrasive blasting is the physical cleaning of dry or suspended abrasive particles in the liquid to the surface of metal parts or products to remove corrosion products. Sand blasting can remove rust, oxide, dry dirt, molding sand or paint on metal surface.Abrasives used for dry blasting include metal sand, iron pellets, fine sand, glass, etc.. Factors such as hardness, density, particle size and shape shall be taken into account when selecting specific abrasives.Sandblasting equipment used by: no use of air sand thrown blade or impeller, pressure nozzle set rubidium: suction nozzle device, see second articles. Sand blasting cleaning is a common method of removing the corrosion products such as ferrous oxide and non-ferrous metal surface oxide
