How H2SO4 is used in the process of pickling?

H2SO4, or sulfuric acid, is used in the pickling process primarily for its strong acidic properties, which help remove rust, scale, and oxides from metal surfaces. This cleaning process prepares the metal for subsequent treatments, such as galvanizing or painting, by ensuring a clean and reactive surface. Additionally, sulfuric acid can aid in the etching process, enhancing the metal's adhesion to coatings. Proper handling and safety measures are essential due to the corrosive nature of sulfuric acid.