Key Applications of Hydrochloric Acid (33%):
Metal Pickling and Surface Treatment: The largest use is removing rust, scale, and iron oxides from steel surfaces, essential before further processing like galvanizing or plating.
Industrial Chemical Production: Used to manufacture PVC (via vinyl chloride), polyurethane, and various inorganic chemicals like aluminum chloride (
) and ferric chloride (
) for water treatment.
Oil and Gas Stimulation: Injected into limestone rock formations to dissolve minerals, increasing porosity and enhancing oil or gas flow.