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Acid pickling corrosion inhibitor and pickling method by using the same

A technology of pickling corrosion inhibitor and phytic acid, applied in the field of pickling and pickling corrosion inhibitor for automobile structural steel, can solve the problems of adverse effects of subsequent treatment, high corrosion rate of steel plates, affecting surface quality, etc., and achieve excellent corrosion resistance. corrosion resistance, less dosage, and the effect of overcoming surface defects

Active Publication Date: 2015-10-21
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The inventor of the present invention found in the process of hot-rolled pickling of automobile structural steel with the existing corrosion inhibitor that the steel plate was often felt to be unclean after pickling. During the pickling process or during the drying process after pickling, It is often found that there are black spots, yellow spots, lumpy black spots and darkening on the whole plate surface, and the corrosion rate of the steel plate is very high and the quality loss is large, which not only affects the surface quality, but also has a negative impact on the subsequent treatment. , the inventor of the present invention thinks that this is due to the high content of chromium and vanadium in the steel of the automobile structure, and realizes that a corrosion inhibitor that is especially suitable for the steel of the automobile structure should be developed

Method used

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  • Acid pickling corrosion inhibitor and pickling method by using the same
  • Acid pickling corrosion inhibitor and pickling method by using the same
  • Acid pickling corrosion inhibitor and pickling method by using the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Add the water of 70kg in the container, add 5kg polyepichlorohydrin base trimethyl ammonium chloride (formula (I) structure, X 1 =Cl, m=4), 10kg of thiourea, 10kg of potassium hydroxyethylidene diphosphate and 5kg of phytic acid were dissolved in sequence to finally obtain the aqueous solution I1 of the pickling corrosion inhibitor.

Embodiment 2

[0041] Add 65kg of water to the container, and add 10kg of tetrabutylammonium iodide, 10kg of thiourea, 10kg of a 1:1 mixture of hydroxyethylidene diphosphate and potassium hydroxyethylidene diphosphate, and 5kg of plant Acids and dissolve them in turn to finally obtain the aqueous solution I2 of the pickling corrosion inhibitor.

Embodiment 3

[0043] Add 82kg of water to the container, and add 5kg of tetradecylbenzyldimethylammonium chloride, 5kg of thiourea, 5kg of potassium hydroxyethylidene diphosphate, and 3kg of phytic acid and tannic acid to the water under stirring conditions. 1:1 mixture and dissolve them in turn to finally obtain the aqueous solution I3 of the pickling corrosion inhibitor.

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Abstract

The present invention relates to the field of corrosion inhibitor, and discloses an acid pickling corrosion inhibitor and a pickling method by using the same. The acid pickling corrosion inhibitor includes a quaternary ammonium compound, thiourea, HEDP and / or its salts, and phytic acid and / or tannic acid. The acid pickling corrosion inhibitor can be used for special steel such automobile structural steel, and has less usage amount and excellent corrosion performance; automotive structural steel hot rolled pickling plate with good surface quality can be obtained; and the method has low operation costs and good economic benefit.

Description

technical field [0001] The invention relates to the field of corrosion inhibitors, in particular to a pickling corrosion inhibitor, a preparation method of the pickling corrosion inhibitor, and a method for pickling automobile structural steel using the pickling corrosion inhibitor. Background technique [0002] P510, P510L, SAPH and other series of hot-rolled pickled plates for automobile structural steel are high-grade products in pickled plates, mainly used in structural parts such as automobile chassis or inner door panels, and have formability and surface comparable to cold-rolled plates. Quality, while the strength is higher than cold-rolled plate. With the continuous development of the automobile industry, the market's requirements for hot-rolled pickled sheets for automobiles continue to increase. Under the premise of ensuring the stamping performance, it is also necessary to have a certain surface gloss to improve the surface quality of product coating and pre-treat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23G1/06
Inventor 许哲峰李正荣郑之旺李俊洪翁建军李卫平王羿周伟
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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