Carbon steel corrosion inhibitor used in oxygen-containing brine and preparation method thereof

A corrosion inhibitor and carbon steel technology, applied in the field of corrosion and protection, can solve the problems of high cost, unfriendly environment, large dosage, etc., and achieve the effect of low cost, simple preparation method and excellent corrosion inhibition effect

Pending Publication Date: 2020-04-03
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In the existing patents, there are almost no reports on the method of improving the corrosion resistance of carbon steel in oxygen-containing brine. Most corrosion inhibitor formulations can improve the corrosion resistance of carbon steel in anaerobic brine, and because they contain expensive molybdate , tungstate, benzotriazole, etc., with large dosage, high cost and unfriendly to the environment

Method used

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  • Carbon steel corrosion inhibitor used in oxygen-containing brine and preparation method thereof
  • Carbon steel corrosion inhibitor used in oxygen-containing brine and preparation method thereof
  • Carbon steel corrosion inhibitor used in oxygen-containing brine and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The discarded shrimp shells were dried in an oven at 120° C. for 15 minutes, and then ground in a ball mill for 10 minutes to obtain a powder with a particle size of about 80 μm. Add a certain amount of deionized water to the shrimp shell powder, stir thoroughly for 10 minutes, then add sodium sulfite, sodium metasilicate pentahydrate and glyceryl palmitate in sequence, and stir well to obtain a uniform corrosion inhibitor solution. The mass fraction of shrimp shell powder is 2%, the mass fraction of sodium sulfite is 25%, the mass fraction of sodium metasilicate pentahydrate is 15%, the mass fraction of glyceryl palmitate is 5%, and the mass fraction of deionized water is 53%.

[0034] The corrosion inhibitor prepared in Example 1 was added to the non-deoxygenated 2% NaCl solution, and the addition amount of the corrosion inhibitor was 150 ppm. The corrosion behavior of Q345R carbon steel was studied using the rotary coupon tester described in GBT18175-2014. At the sa...

Embodiment 2

[0037] The discarded shrimp shells were dried in an oven at 130° C. for 15 minutes, and then ground in a ball mill for 15 minutes to obtain a powder with a particle size of about 60 μm. Add a certain amount of deionized water to the shrimp shell powder, stir well for 10 minutes, then add potassium sulfite, potassium metasilicate pentahydrate and glyceryl pearlescent fatty acid in sequence, and get a uniform corrosion inhibitor solution after stirring well. Wherein the mass fraction of shrimp shell powder is 6%, the mass fraction of potassium sulfite is 30%, the mass fraction of potassium metasilicate pentahydrate is 10%, the mass fraction of pearlescent fatty acid glyceride is 10%, and the mass fraction of deionized water is 44%. .

[0038]The corrosion inhibitor prepared in Example 2 was added to the non-deoxygenated 2% NaCl solution, and the addition amount of the corrosion inhibitor was 130 ppm. The corrosion behavior of Q345R carbon steel was studied using the rotary coup...

Embodiment 3

[0040] The discarded shrimp shells were dried in an oven at 150° C. for 15 minutes, and then ground in a ball mill for 20 minutes to obtain a powder with a particle size of about 30 μm. Add a certain amount of deionized water to the shrimp shell powder, stir thoroughly for 10 minutes, then add sodium sulfite, potassium metasilicate pentahydrate and glyceryl stearate in turn, and stir well to obtain a uniform corrosion inhibitor solution. The mass fraction of shrimp shell powder is 9%, the mass fraction of sodium sulfite is 12%, the mass fraction of potassium metasilicate pentahydrate is 25%, the mass fraction of glyceryl stearate is 15%, and the mass fraction of deionized water is 39%.

[0041] The corrosion inhibitor prepared in Example 3 was added to the non-deoxygenated 2% NaCl solution, and the addition amount of the corrosion inhibitor was 110 ppm. The corrosion behavior of Q345R carbon steel was studied using the rotary coupon tester described in GBT18175-2014. At the s...

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Abstract

The invention relates to a carbon steel corrosion inhibitor used in oxygen-containing brine and a preparation method thereof. The corrosion inhibitor includes 1-10 wt% of shrimp shell powder, 10-30 wt% of alkali metal sulfite, 5-25wt% of alkali metal silicate, 5-15 wt% of higher fatty acid glyceride and the balance water. The prepared corrosion inhibitor is added into the oxygen-containing brine according to a certain proportion, after verification, the corrosion rate of carbon steel is lower than 0.1 mm / a, the carbon steel corrosion inhibitor can serve as the corrosion inhibitor for the carbon steel in the oxygen-containing brine, and the characteristics that cost is low, the effect is good, and environment protecting is achieved are achieved.

Description

technical field [0001] The invention belongs to the field of corrosion and protection, in particular to a corrosion inhibitor for carbon steel in oxygen-containing brine and a preparation method thereof. Background technique [0002] High-salt and high-COD wastewater has always been a difficult problem in the field of wastewater treatment. In recent years, many methods for treating this type of wastewater have been disclosed, such as CN104909504B (a high-salt and high-COD wastewater treatment system and method), CN208577599U (a method for treating high-salt and high-COD wastewater) system), CN109824194A (a treatment method for high-salt and high-COD organic wastewater), CN109052796A (a zero-discharge process and device for high-salt and high-COD wastewater treatment), etc. In the above treatment process, due to the presence of oxidizing groups, the treated brine is very corrosive, which brings great risk of corrosion and leakage to carbon steel equipment and pipelines. Ther...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F11/18C23F11/12
CPCC23F11/182C23F11/12
Inventor 李云钊王育武刘洋洋王龙山胡亚东张宏科
Owner WANHUA CHEM GRP CO LTD
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