A hot-rolled pickling corrosion inhibitor and a pickling method using the hot-rolled pickling corrosion inhibitor
A technology of hot-rolled pickling and corrosion inhibitor, which is applied in the field of pickling of automobile structural steel and hot-rolled pickling corrosion inhibitor, can solve the problems of adverse effects of follow-up treatment, affecting surface quality, high corrosion rate of steel plate, etc., and achieves excellent Corrosion inhibition performance, overcoming surface defects, the effect of less dosage
Active Publication Date: 2017-06-30
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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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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Embodiment 1
[0040] Add the water of 70kg in the container, add 5kg polyepichlorohydrin base trimethyl ammonium chloride (formula (I) structure, X 1 =Cl, m=4), 10kg thiourea, 10kg potassium hydroxyethylidene diphosphate and 5kg glycolic acid were dissolved in sequence to finally obtain the aqueous solution I1 of the hot rolling pickling corrosion inhibitor.
Embodiment 2
[0042] 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 hydroxyl Acetic acid and make them dissolve successively, finally obtain the aqueous solution I2 of hot rolling pickling corrosion inhibitor.
Embodiment 3
[0044] Add 82kg of water in the container, add 5kg tetradecyl benzyl dimethyl ammonium chloride, 5kg thiourea, 5kg potassium hydroxyethylidene diphosphate and 3kg glycolic acid successively to the water under stirring conditions and make them sequentially Dissolved to finally obtain the aqueous solution I3 of the hot rolling pickling corrosion inhibitor.
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Abstract
The invention relates to the field of corrosion inhibitors, and discloses a hot-rolled pickling corrosion inhibitor and a pickling method using the hot-rolled pickling corrosion inhibitor. The hot-rolled pickling corrosion inhibitor includes quaternary ammonium salt compounds , thiourea, hydroxyethylidene diphosphate and / or its salts, and glycolic acid. The hot-rolled pickling corrosion inhibitor can be used for special steel types such as automobile structural steel, and has a small dosage and has excellent corrosion inhibition performance, and can obtain hot-rolled pickling plates of automobile structural steel with better surface quality, and run Low cost and good economic benefit.
Description
technical field [0001] The invention relates to the field of corrosion inhibitors, in particular, to a hot-rolled pickling corrosion inhibitor, a preparation method of the hot-rolled pickling corrosion inhibitor, and the use of the hot-rolled pickling corrosion inhibitor to acidify automobile structural steel Washing method. 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 sheet. 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 surf...
Claims
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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