Study on the corrosion inhibitor and fog suppressor for chemical pickling of iron and steel

A new type of corrosion inhibitor and fog suppressor composed of Nitrogen-containing alkaloid, water-soluble butadiene lower polymer, and inorganic electrolyte has been investigated by gravimetric and electrochemical method. Effects of this chemicals on pickling rate and hydrogen penetration into iron and steel material in 50∼150 g/L HCl or/and H₂SO₄ solutions at 20∼70°C temperature were examined. The amount of acid fog escaping from the surface of air-liquid was determined by chemical titration. The results indicate that the efficiency of inhibition and suppression depends on film properties by which mean a barrier film on the interface of bare mild steel/solution or an unsolvable liquid membrane as hydrophibic effect. In present work the film-forming mechanism by in situ and chemistry-mechanics effect is also discussed. Supported by the National Natural Science Foundation of China Tao Yingchu, born in Jun. 1943, Prof.