Study on Mathematical Model for Pickling of Automotive High Strength Steel
The effects of acid concentration, temperature and the thickness of strip oxide scale on the pickling time of high strength steel were studied and a pickling time mode was established. The end time of acid pickling was determined by introducing the electropotetial derivative near zero method. The effects of different pickling temperatures and acid concentrations on the pickling time of different thickness scales were studied by further experiments. When increase acid concentration to 10%, pickling time is greatly reduced, and continue to increase the acid concentration will have little help to shorten the pickling time. When the acid temperature reaches 80 ℃, the pickling efficiency reaches the highest value. If the temperature continuous to increase, it will not only waste energy but also increases the volatilization of hydrochloric acid. The comprehensive pickling model was established and the actual high strength steel pickling data was brought into the test. The proposed comprehensive pickling model in this paper has better accuracy and validity than the old ones.