Acid pickling promotor for iron and steel

Abstract

The acid pickling promoter for iron and steel consists of inorganic salt as reducing agent 10-80 wt%, organic metal ion chelating chelating agent 1-20 wt%, synergist 1-20 wt% and water 10-50 wt%. The acid pickling promoter is suitable for being added into acid pickling liquid to promote the elimination of dense oxide scale on the surface of steel, shapes and other iron and steel product. It can raise the surface quality of silicon steel plate after being acid pickled, shorten acid pickling period, reduce acid consumption and improve acid pickling environment.

Description

technical field

[0001] The invention belongs to the technical field of metal cleaning by chemical method, and in particular relates to a steel pickling accelerator, which is especially suitable for the pickling treatment of silicon steel. Background technique

[0002] A layer of dense oxide scale is formed on the surface of steel when the temperature is above 700 °C. The composition, thickness and porosity of scale vary with steel types and processing techniques. Generally speaking, the bottom layer of the oxide scale formed by steel at high temperature near the substrate is ferrous oxide (FeO), and the middle layer is iron oxide (FeO). 2 o 3 ), the outer layer of oxide skin is ferric oxide (Fe 3 o 4 ). This oxide scale must be removed in the production of the steel industry, otherwise it may affect the post-processing process.

[0003] In order to increase steel output, it is necessary to increase the speed of steel pickling to remove scale. At present, there are mul...