Abstract
Sulphates, chlorides, nitrates and oxidising agents were studied as impurities in sulphuric acid and hydrochloric acid. Presence of chlorides inhibited the dissolution of mild steel in sulphuric acid whereas presence of nitrates and oxidising agents accelerated the reaction. In the case of hydrochloric acid, mild steel dissolution was inhibited by sulphate impurities and was accelerated by nitrates and oxidising agents. Ipomoea and Amaranthus (5%) were used as inhibitors. Both of them showed good performance in the two acids in the presence of impurities.
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