Chemistry | H2SO4 | Monitoring Pickling Baths

Monitoring the acid and iron salt concentration is essential to operate a pickling line at the most efficient operating point. The pickling time can be optimized without under-pickling. The risk of over-pickling and the consumption of acid, cleaning fluids and energy are minimized. The highly reliable pickling bath monitor from Anton Paar provides this information. The measuring system is maintenance free and easy to operate.

Pickling Process

In many fields of the metalworking industry, pickling baths are used to cleaning metal surfaces from impurities, for passivating or selectively removing surfaces.
Pickling is an important production step, for example between hot and cold rolling. Scale, formed in the hot rolling section, has to be removed by pickling befor the thickness is reduced again in the cold rolling section. It is also a pre-treatment procedure for metals to remove impurities such as rust, stains and inorganic contaminations befor coating.
Pickling liquids (pickle liquor) are acids (rarely bases) containing dissolved metal salts. The acid used depends on the nature of the oxides. Carbon Steels are often pickled with sulfuric acid (H2SO4) and hydrochloric acid (HCI).

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