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Special hydrochloric acid pickling corrosion inhibitor for spring steel

A technology of pickling corrosion inhibitor and spring steel, which is applied in the chemical industry, can solve the problems of high production cost and high toxicity of pickling corrosion inhibitor, and achieve the effects of human safety, inhibition of harmful corrosion and high efficiency

Inactive Publication Date: 2016-09-21
UNIV OF SHANGHAI FOR SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the above technical problems in the prior art, the invention provides a special hydrochloric acid pickling corrosion inhibitor for spring steel. The corrosion inhibitor contains highly toxic and high production cost technical problems, and the corrosion inhibitor in the present invention is specially used for spring steel hydrochloric acid pickling

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The percentage content of the corrosion inhibitor specially used for spring steel pickling in the present invention is as follows: 10 g of urotropine, 10 g of geeramine, 5 g of ammonium iodide, and 150 ml of water. The spring steel sample used in the experiment is: the material is 55SiCr, the diameter is 16mm, and the length is 20mm.

[0018] Application of pickling corrosion inhibitor in spring steel pickling: Add the corrosion inhibitor obtained according to the above percentage content to the pickling liquid hydrochloric acid at a ratio of 1g / 100ml, the volume of hydrochloric acid is 500ml, and the mass percentage concentration is 24% , add 5ml of corrosion inhibitor, heat to 65°C, and immerse the spring steel sample in the pickling solution for 5min. The weight loss rate was 0.0017g / min. The weight loss rate without adding corrosion inhibitor is 0.0316g / min. The corrosion inhibition efficiency is 94.62%. Shown as an efficient corrosion inhibitor.

Embodiment 2

[0020] The percentage content of the corrosion inhibitor specially used for spring steel pickling in the present invention is as follows: 10 g of urotropine, 5 g of geeramine, 5 g of ammonium iodide, and 120 ml of water. The spring steel sample used for the experiment is: the material is 60Si 2 Mn with a diameter of 15mm and a length of 20mm.

[0021] Application of pickling corrosion inhibitor in spring steel pickling: Add the corrosion inhibitor obtained according to the above percentage content to the pickling liquid hydrochloric acid at a ratio of 1g / 100ml, the volume of hydrochloric acid is 500ml, and the mass percentage concentration is 24% , add 5ml of corrosion inhibitor, heat to 65°C, and immerse the spring steel sample in the pickling solution for 5min. The weight loss rate was 0.0016g / min. The weight loss rate without adding corrosion inhibitor is 0.0335g / min. The corrosion inhibition efficiency is 95.22%. Shown as an efficient corrosion inhibitor.

Embodiment 3

[0023] The percentage content of the corrosion inhibitor specially used for spring steel pickling in the present invention is as follows: 5 g of urotropine, 3 g of geeramine, 2 g of ammonium iodide, and 100 ml of water. The spring steel sample used in the experiment is: the material is 55SiCr, the diameter is 18mm, and the length is 20mm.

[0024] Application of pickling corrosion inhibitor in spring steel pickling: Add the corrosion inhibitor obtained according to the above percentage content to the pickling liquid hydrochloric acid at a ratio of 1g / 100ml, the volume of hydrochloric acid is 500ml, and the mass percentage concentration is 24% , add 5ml of corrosion inhibitor, heat to 65°C, and immerse the spring steel sample in the pickling solution for 5min. The weight loss rate was 0.0022g / min. The weight loss rate without adding corrosion inhibitor is 0.0382g / min. The corrosion inhibition efficiency is 94.24%. Shown as an efficient corrosion inhibitor.

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Abstract

The invention provides a special hydrochloric acid pickling corrosion inhibitor for spring steel. The special hydrochloric acid pickling corrosion inhibitor is prepared from the following materials in weight proportion: 10 to 30g of urotropine, 2 to 10g of geramine, 1 to 5g of ammonium iodide and 100 to 150ml of water. According to the special hydrochloric acid pickling corrosion inhibitor for the spring steel, provided by the invention, the corrosion of hydrochloric acid to a steel matrix is reduced, and the influence on performance of the spring steel is reduced; in the pickling process, the capability of hydrogen absorption of steel is reduced, and the hydrogen embrittlement phenomenon of the steel is effectively inhibited; the utilization rate of a pickling solution is improved; and by adding the corrosion inhibitor, harmful corrosion of the pickling solution to the spring steel is effectively inhibited, thereby inhibiting excessive consumption of the pickling solution. The special hydrochloric acid pickling corrosion inhibitor provided by the invention has predominant advantages of low consumption and high efficiency of removing oxide scale. In addition, corrosion inhibitor components do not contain toxic substances, so the special hydrochloric acid pickling corrosion inhibitor is safe to a human body.

Description

technical field [0001] The invention belongs to the field of chemical industry and relates to a corrosion inhibitor, in particular to a special hydrochloric acid pickling corrosion inhibitor for spring steel. Background technique [0002] In the production process of spring steel, it is first necessary to remove the oxide scale on the surface of the steel. In industrial production, it is often pickled with highly corrosive hydrochloric acid. In the process of removing surface scale by hydrochloric acid pickling, due to the strong corrosion of hydrochloric acid on steel, the phenomenon of "over-corrosion" often occurs, causing certain corrosion to the spring steel substrate, affecting the performance of the spring steel material, and causing pickling Liquid wastage. At the same time, during the pickling process, the hydrogen produced by pickling continuously penetrates into the steel matrix, and the spring rigid matrix absorbs hydrogen, causing "hydrogen embrittlement", whic...

Claims

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Application Information

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IPC IPC(8): C23G1/06C23G1/08
CPCC23G1/063C23G1/08
Inventor 袁宏梅刘新宽乔亚楠高加强王军艺
Owner UNIV OF SHANGHAI FOR SCI & TECH
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