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Corrosion inhibitor suitable for acidic medium as well as preparation method and application thereof

An acid medium and corrosion inhibitor technology, applied in the field of corrosion inhibitor and its preparation, can solve the problems of poor temperature adaptability, low efficiency, high dosage, etc., and achieve easy transportation and storage, good solubility, and easy preparation. Effect

Active Publication Date: 2021-04-20
ANSTEEL GRP MINING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, the existing corrosion inhibitors have disadvantages such as large dosage, low efficiency, and poor temperature adaptability. Therefore, the present invention chooses to utilize the synergistic effect between organic corrosion inhibitors, and through molecular design of organic substances containing multiple adsorption centers, And high temperature environment test, finally developed a new type of corrosion inhibitor suitable for acidic medium

Method used

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  • Corrosion inhibitor suitable for acidic medium as well as preparation method and application thereof
  • Corrosion inhibitor suitable for acidic medium as well as preparation method and application thereof
  • Corrosion inhibitor suitable for acidic medium as well as preparation method and application thereof

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Effect test

preparation example Construction

[0040] The preparation method and steps of DAMP are the same as DAME, wherein the dibromoethane is replaced by 0.96g (4.76mmol) dibromopropane to obtain 2.14g of DAMP.

[0041] The BQA preparation method: weigh 3.2375g (25.0mmol) of quinoline and 1.75g ​​(10.0mmol) of p-dichlorobenzyl in a dry reactor, add 75ml of absolute ethanol, and mix under 500r / min stirring, Until p-dichlorobenzyl is dissolved, heat up to 80°C, maintain ethanol reflux for 24 hours, the solution gradually turns from yellow to pink, stop heating, distill off the ethanol in the mixture, dissolve the unreacted raw materials with 30ml of acetone, and filter , and then the solid was recrystallized 4 times with anhydrous ethanol-ethyl acetate according to the volume ratio of 1:1 mixed solvent total 80ml, and the obtained pink solid was dried under reduced pressure in a vacuum oven at 50°C to obtain BQA3.97g.

[0042]The preparation method of described aryl bicyclic imidazoline quaternary ammonium salt: 1.22g (1...

Embodiment 1

[0050] Raw material ratio: DAME2%, DAMP3%, BQA 10%, EDTA5% and methanol 80%.

[0051] Table 1

[0052] Corrosion inhibitor concentration (mg L -1 )

[0053] It can be seen from Table 1 that in the range of 30-110mg·L -1 Within the concentration range, after adding the corrosion inhibitor, the corrosion rate of low carbon steel decreased significantly, from 22.54g / m 2 h dropped sharply to 3.7g / m 2 h, the corrosion inhibition efficiency reached 83.58%, which proves that the corrosion inhibitor can effectively inhibit the corrosion of low carbon steel in 1mol / L HCl. significantly increased, indicating that more corrosion inhibitor molecules were adsorbed on the surface of the test piece.

Embodiment 2

[0065] Raw material ratio: 5% of amine derivatives DAME, 5% of DAMP, 20% of nitrogen-containing heterocyclic bisquaternary ammonium salt BQA, 10% of EDTA and 60% of ethanol.

[0066] Table 4

[0067] Corrosion inhibitor concentration (mg L -1 )

[0068] It can be seen from Table 4 that at 50-250mg·L -1 Within the concentration range, after adding the corrosion inhibitor, the corrosion rate of low carbon steel decreased significantly, from 22.54g / m 2 h dropped sharply to 1.6g / m 2 h, the corrosion inhibition efficiency reached 92.90%, which proved that the corrosion inhibitor can effectively inhibit the corrosion of low carbon steel in 1mol / L. Larger, indicating that more corrosion inhibitor molecules are adsorbed on the surface of the test piece.

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Abstract

The invention relates to a corrosion inhibitor suitable for an acidic medium. The corrosion inhibitor is composed of the following raw materials in percentage by weight: 5-20% of amine derivative, 10-35% of imidazole quaternary ammonium salt, 5-25% of ethylenediamine tetraacetic acid disodium salt and 20-80% of low molecular alcohol, wherein the amine derivative is N, N, N ', N'-tetrahydroxyethyl ethylenediamine or N, N, N ', N'-tetrahydroxyethyl propanediamine or a mixture of the N, N, N ', N'-tetrahydroxyethyl ethylenediamine and the N, N, N ', N'-tetrahydroxyethyl propanediamine; the quaternary ammonium salt is aryl bicyclo-imidazoline quaternary ammonium salt or nitrogen-containing heterocyclic biquaternary ammonium salt or a mixture of the aryl bicyclo-imidazoline quaternary ammonium salt and the nitrogen-containing heterocyclic biquaternary ammonium salt; and the low-molecular alcohol is methanol or ethanol. The corrosion inhibitor disclosed by the invention is small in dosage, long in acting time, high-temperature-resistant and environment-friendly. The corrosion inhibitor has multiple adsorption centers and coordinates with Fe to form an adsorption film, so that contact between metal and an acid medium is inhibited, a good corrosion inhibition effect is achieved, the corrosion inhibition efficiency can reach 97.78%, the corrosion inhibition efficiency at the high temperature can reach 87.08%, and after 72 h, the corrosion inhibition efficiency still reaches 88.28%.

Description

technical field [0001] The invention relates to the technical field of metal corrosion protection, in particular to a corrosion inhibitor suitable for acidic medium and its preparation method and application. Background technique [0002] In industrial production, metal corrosion is unavoidable, especially in acidic environments, and its cost is quite high, often causing immeasurable losses. The main hazards of metal corrosion are: economic losses, disasters and energy waste. In order to understand and reduce corrosion losses, many professionals and related asset owners are interested. In 2015, the Chinese Academy of Sciences launched an important consulting project - Corrosion Research Status and Control Strategies, aiming to determine the cost of corrosion in China. The study estimates that the cost of corrosion in China is about 2127.8 million RMB, which is about 3.34% of the GDP. At the same time, corrosion has become a non-negligible factor hindering the development o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F11/04
Inventor 张强周丽刘新刚林岩李宇于开波韩松郭客
Owner ANSTEEL GRP MINING CO LTD