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Corrosion inhibitor for pickling of hot-rolled automobile structural steel and preparation and use method thereof

A technology of automobile structure and corrosion inhibitor, which is applied in the field of hot-rolled carbon steel anti-corrosion and hot-rolled pickling strip pickling corrosion inhibitor, can solve the problem of decreased hydrochloric acid consumption, high acid pickling corrosion inhibition rate and low addition amount and other problems, to achieve the effect of reducing the corrosion rate of steel plates, simple production process and low usage.

Active Publication Date: 2017-10-13
PANGANG GRP XICHANG STEEL & VANADIUM CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the above defects, the present invention provides a corrosion inhibitor for pickling of hot-rolled automobile structural steel. The composite corrosion inhibitor of the present invention is added to the acid bath of the hot-rolled pickling line, and the addition amount is low, and the unit consumption is low. The corrosion inhibition rate is high, and at the same time, the consumption of hydrochloric acid is also reduced; by adding the composite corrosion inhibitor of the present invention, the surface gloss of the hot-rolled pickled plate is high, even in the case of over-pickling, the hot-rolled pickled plate The surface gloss is also greater than 55

Method used

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  • Corrosion inhibitor for pickling of hot-rolled automobile structural steel and preparation and use method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The preparation method of the composite corrosion inhibitor that the present invention relates to is:

[0029] ① Add 70kg of water to the container;

[0030] ②Polyepichlorohydrin quaternary ammonium salt 5kg, stir evenly and place;

[0031] ③ Add 10kg of thiourea to ②, stir evenly and wait for use;

[0032] ④Heat phytate 10kg in the above-mentioned container and stir evenly;

[0033] ⑤ Add 5kg of citric acid and stir evenly, and the compound corrosion inhibitor is prepared.

[0034] The hot-rolled pickling line uses HCl solution, and the prepared corrosion inhibitor is added to the hot-rolled pickling line acid tank. The free acid HCl concentration of the hot-rolled pickling line is 100-120g / L; the pickling temperature is 70-80 ℃, the pickling speed is 80-150m / min; the amount of corrosion inhibitor added is 0.05%-0.1% of the total weight of the HCl acid solution (the total amount of acid solution in the acid tank is about 200 tons, and the amount of corrosion inhibit...

Embodiment 2

[0040] The preparation method is the same as in Example 1, except that the ratio of raw materials is different: 7 kg of polyepichlorohydrin quaternary ammonium salt; 8 kg of thiourea; 8 kg of phytic acid ester, 4 kg of citric acid, and 73 kg of water. The acid consumption, surface brightness, surface gloss, weight loss rate and other indicators are shown in Table 1.

Embodiment 3

[0041] The preparation method of Example 3 is the same as that of Example 1, except that the proportion of raw materials is different: 10 kg of polyepichlorohydrin quaternary ammonium salt; 5 kg of thiourea; 5 kg of phytate, 3 kg of citric acid, and 77 kg of water. The acid consumption, surface brightness, surface gloss, weight loss rate and other indicators are shown in Table 1.

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Abstract

The invention relates to the technical field of pickling corrosion inhibitors for hot-rolled pickled strips, and belongs to the technical field of hot-rolled carbon steel corrosion protection. The invention provides a corrosion inhibitor for pickling of hot-rolled automobile structural steel. The raw materials and weight ratio of the corrosion inhibitor are: polyepichlorohydrin quaternary ammonium salt 5%-10%; thiourea 5%- 10%; Phytate 5%‑10%, Citric Acid 3%‑5%; balance water. The corrosion inhibitor of the invention has low usage amount and good corrosion inhibition effect; the surface brightness and gloss of the hot-rolled automobile structural steel after pickling are improved, and at the same time, the consumption of HCl is reduced, the corrosion rate of the steel plate is reduced, and the cost is negatively increased.

Description

technical field [0001] The invention relates to the technical field of pickling corrosion inhibitors for hot-rolled pickled strips, and belongs to the technical field of hot-rolled carbon steel corrosion protection. Background technique [0002] Hot-rolled pickled plate is an emerging variety of plate and strip production and development. It uses high-quality hot-rolled thin plate as raw material. Forming or stamping performance) is an intermediate product between hot-rolled sheets and cold-rolled sheets, and is an ideal substitute for some cold-rolled sheets. Hot-rolled pickled plates include cold forming steel, structural steel, automotive structural steel and other series. [0003] 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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23G1/06C23G1/08
Inventor 许哲峰李俊洪周三保苏琳陈东旭陈天荣
Owner PANGANG GRP XICHANG STEEL & VANADIUM CO LTD
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