![]() ![]() Prior to cold rolling operation, hot rolled steel is normally passed through a pickling line so as to eradicate the scale from the surface. In order to remove the scale the workpiece is dipped into a vat of pickle liquor. Many hot working processes and other processes that occur at high temperatures leave a discoloring oxide layer or scale on the surface. ![]() Pickling is sometimes called acid cleaning if descaling is not needed. Solutions usually also contain additives such as wetting agents and corrosion inhibitors. Also alkaline solutions can be used for cleaning metal surfaces. Strong acids, such as hydrochloric acid and sulfuric acid are common, but different applications use various other acids. Various chemical solutions are usually used to clean these impurities. Metal surfaces can contain impurities that may affect usage of the product or further processing like plating with metal or painting. Further information: Hydrochloric acid ยง Pickling of steel ![]()
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