Factors Affecting Strip Pickling

1. The effect of hydrochloric acid concentration and temperature

In hydrochloric acid solution, the pickling speed increases with the increase of acid concentration and temperature, but the acid concentration and temperature are limited due to the volatile hydrochloric acid.

2. The effect of FeCl2 in acid solution

The shortest pickling time is obtained when the content of FeCl2 in the acid solution is optimal; the optimal FeCl2 content is lower than about 4-8% of its saturation value in this state; when FeCl2 is close to the saturation value, Pickling time is longest.

During the whole period of hydrochloric acid pickling, although the content of hydrochloric acid is decreasing, FeCl2 increases correspondingly at the same time. The two influencing factors cancel each other out within a certain pickling time, so the pickling speed during this period only changes slightly.

The pickling speed is to make the strip steel reach the predetermined time in the acid solution, and the too fast speed passes through the acid solution, resulting in under-pickling.

The degree of mechanical phosphorus breaking is sufficient to accelerate the pickling speed.