Acid pickling promotor for iron and steel

An iron and steel pickling and accelerator technology, applied in the field of silicon steel pickling treatment and iron and steel pickling accelerator, can solve the problems of no product coming out, not seen, inappropriate, etc., to achieve convenient preparation and use, reduce pickling temperature , the effect of reducing the acid concentration

Inactive Publication Date: 2003-04-09
HUAZHONG UNIV OF SCI & TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Pickling agents for carbon steel and stainless steel are not suitable for pickling of silicon steel
At present, there is no literature report about the steel pickling accelerator suitable for silicon steel pickling in China, and there is no product coming out.

Method used

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Examples

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Embodiment Construction

[0021] Composition and weight

[0022] When using the pickling accelerator of the present invention, it is usually in an acid solution at 20°C to 95°C. Concentration weight percentage 2%~20%), hydrofluoric acid (acid liquid concentration weight percentage 2%~20%) and any two kinds of mixed acids in the above-mentioned three kinds of acids, adding weight percentage is 0.2%~2% Iron and steel pickling accelerator, which can accelerate the removal of oxide scale formed on steel at high temperature above 700°C and improve the quality of pickling on steel surface. For the continuous pickling unit for silicon steel, in the hydrochloric acid solution (acid solution concentration weight percent 2%~20%), add the iron and steel pickling accelerant of the present invention that is 0.2%~2% by weight, can improve steel strip running speed (from 20m / min to 25-30m / min), or reduce the pickling temperature (from 95°C to 90°C), which has obvious effect of removing the oxide scale on th...

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PUM

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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. In order to increase steel output, it is necessary to increase the speed of steel pickling to remove scale. At present, there are multiple pic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23G1/08
Inventor 李国敏付朝阳郑家燊彭芳明俞敦义杨振玺张学圣肖笛肖怀斌应宏杨华国黄煊官孙祥圣
Owner HUAZHONG UNIV OF SCI & TECH
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