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Strip steel acid pickling method

A technology of steel acid and strip steel, which is applied in the field of steel rolling, can solve problems affecting product quality, yellow rust spots, etc., and achieve the effect of reducing rust spots and reducing the probability of rust spots

Inactive Publication Date: 2016-02-24
PANGANG GRP XICHANG STEEL & VANADIUM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in actual production, it is found that yellow rust spots are easy to appear on the surface of strip steel after pickling and rinsing. This problem is especially serious in the production of steel plates such as SAPH370-B, SAPH400-B, and SAPH440-B. The rust spots are in the subsequent drying process. After that, it is closely attached to the surface of the strip steel, which affects the product quality

Method used

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Embodiment Construction

[0011] Below in conjunction with embodiment the present invention is further described: strip steel pickling method, comprise the step that strip steel passes through pickling section and rinsing section successively, described rinsing section is also provided with the wringer roll that is used to wring out strip steel surface liquid, so A corrosion inhibitor is added to the pickling tank of the pickling section, and the corrosion inhibitor contains the following components by mass percentage: 3% of non-ionic surfactant, 2% to 4% of polyamine, 2% of m-xylylenediamine %~6%, propynyl alcohol 0.5%~0.8%, glycerin 0.5%~0.8%, and the rest is water.

[0012] In the strip steel pickling method of the present invention, a corrosion inhibitor is added in the pickling tank, and the components of the corrosion inhibitor contain by mass percentage: 3% of nonionic surfactant, 2% to 4% of polyamine, m-phthalylene 2% to 6% of amine, 0.5% to 0.8% of propynyl alcohol, 0.5% to 0.8% of glycerol, ...

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Abstract

The invention relates to a strip steel acid pickling method. The strip steel acid pickling method includes the step that strip steel sequentially passes through an acid pickling section and a rinsing section. Squeezing rollers used for squeezing and removing liquid on the surface of the strip steel are further disposed on the rinsing section. A corrosion inhibitor is added into pickling tanks of the acid pickling section. The corrosion inhibitor contains, by mass, 3% of a nonionic surface active agent, 2-4% of polyamine, 2-6% of m-xylylenediamine, 0.5-0.8% of propargyl alcohol, 0.5-0.8% of glycerine and the balance water. By means of the strip steel acid pickling method, the corrosion inhibitor of a specific formula is added into the pickling tanks, so that film forming by adsorption of the corrosion inhibitor is achieved on the surface of base iron of the strip steel, iron rust generated by the base iron and water is retarded or avoided, and the rusty spots generated after acid pickling of the strip steel are remarkably reduced; the circumferential surface of each squeezing roller adopted for the rinsing line is arc, so that residual moisture on the surface of the strip steel is advantageously squeezed and removed completely, and generation probability of the rusty spots is lowered.

Description

technical field [0001] The invention relates to the field of steel rolling, in particular to a strip steel pickling method. Background technique [0002] The strip steel pickling plate production line includes pickling and rinsing processes, the main purpose of which is to remove the iron oxide layer on the surface of the strip steel. The pickling section usually includes a plurality of continuous pickling tanks, and the rinsing section includes a plurality of rinsing tanks. The acid solution in the pickling tank dissolves, mechanically peels off, reduces and infiltrates the oxide scale on the surface of the strip steel, so that the oxide layer falls off and dissolves, exposing the inner strip steel base iron. Then the strip steel enters the rinsing tank, and the acid solution on the surface of the strip steel is washed away by desalinated water to prevent the acid solution remaining on the surface of the strip steel and excessive corrosion of the base iron. Squeeze rolls ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23G1/06
CPCC23G1/061
Inventor 曹万余陈俊陈东旭陈天荣邓承龙
Owner PANGANG GRP XICHANG STEEL & VANADIUM CO LTD
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