Researchs Of Plain Carbon Steel Pickling Acid-mist Depressing

Pickling is a common means of surface treatment。Commonly used pickling acids are hydrochloric acid, nitric acid, sulfuric acid and hydrofluoric acid, etc., of which hydrochloric acid is widely used for its speed, low cost, less impact on the material advantages.However, the process of pickling will produce a lot of hydrochloric acid mist, not only the severe corrosion equipment, plant, and the present harm to human health. With the increased awareness of environmental protection, environmental pollution caused by acid washing operation is increasingly concerned. Therefore, the development of new and efficient fog corrosion inhibitor, corrosion gentle fog has important practical applications.The issue study the corrosion with fog effects and the slow corrosion effect of the hydrochloric acid lotion, with added solvents such as Urotropine, sodium dodecyl sulfate, thiourea, OP, and1,4-butynediol, on carbon steel.And we compare the fog inhibitor of time, temperature, concentration and amount of hydrochloric acid. We use the orthogonal experimental design method to optimize the best formulation of additives in mixed fog inhibitor.At60℃, the pickling time of200mL18%hydrochloric acid lotion is30min, The best formula fog inhibitor is as following:Urotropine1.07g (0.54%)Thiourea0.36g (0.17%)Sodium dodecyl sulfate1.07g (0.54%)The Optimal concentration is1.25%,Hydrochloric acid for Carbon Steel has a good fog effect at60℃, hydrochloric acid on carbon steel has good corrosion inhibition at30-70℃environment.This research obtained the best formula of Fog Inhibitor for Carbon Steel is pickling at room temperature with18%HCl, with corrosion rate of98.70%, fog inhibitor rate of95.21%,...