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Pickling compound corrosion inhibitor for thermal equipment and preparation method thereof

A technology of thermal equipment and corrosion inhibitor, which is applied in the field of electric power equipment and chemistry, can solve the problems of strong corrosion, corrosion inhibition performance and corrosion inhibition efficiency that cannot reach the corrosion inhibitor used for pickling, so as to reduce the content and improve corrosion inhibition. Performance and efficiency, impact reduction effect

Active Publication Date: 2020-09-15
CHONGQING ELECTRIC POWER COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, hydrochloric acid is highly corrosive to metals and sensitive to low-alloy steels. The development of highly efficient, environmentally friendly and environmentally friendly corrosion inhibitors has become a hot spot in the research of hydrochloric acid pickling corrosion inhibitors.
[0003] In recent years, researchers at home and abroad have used the active ingredients in natural plants as pickling corrosion inhibitors, which have shown good corrosion inhibition performance. However, the corrosion inhibition performance and corrosion inhibition efficiency of these natural corrosion inhibitors alone have reached Not meeting the requirements as a corrosion inhibitor for pickling of thermal equipment in power plants

Method used

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  • Pickling compound corrosion inhibitor for thermal equipment and preparation method thereof
  • Pickling compound corrosion inhibitor for thermal equipment and preparation method thereof
  • Pickling compound corrosion inhibitor for thermal equipment and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Example 1 Extraction of Effective Corrosion Inhibition Components of Tea Seed Shell (Extract)

[0038] After natural air-drying of fresh tea seed husks, the temperature is controlled in an oven at 60°C, dried to constant weight, ground into powder with a laboratory pulverizer, and 10.0 g of the powder is accurately weighed and loaded into a Soxhlet extractor. The extractant adopts 75% ethanol whose dosage is 15 times of the weight of the tea seed shell powder, the extraction temperature is 85° C., and the extraction time is 1 hour. The obtained natural corrosion inhibitor extract powder is degreased and decolorized with an appropriate amount of petroleum ether, and then spin-dried in a rotary evaporator, and then dried in a blast drying oven at 60±1°C for 5 hours to obtain tea seed hull corrosion inhibitor powder , and the yield was 15.65%.

Embodiment 2

[0039] Embodiment 2 tea seed husk provides corrosion inhibition performance evaluation method

[0040] Weightlessness

[0041] Referring to the electric power industry standard, the static hanging method is adopted. Before the experiment, the corrosion test piece is polished to the mirror surface with metallographic sandpaper 1#, 2#, 3#, 4#, 5#, 6#, 6#, 7#, and the surface is rough Ra0.4μm, then degreasing with acetone, washing with absolute ethanol, drying with cold air, and finally placing in a desiccator for later use. During the experiment, a number of 250ml beakers were used to configure 200ml of 5% (weight percentage, the same below) hydrochloric acid pickling solution widely used in pickling of thermal equipment. The temperature was controlled at 55±2°C, and a certain amount of tea was added to the above pickling medium Seed husk extract or a compound of a certain amount of tea seed husk extract and other medicines, and no corrosion inhibitor is added to a beaker, as a...

Embodiment 3

[0051] Example 3 tea seed shell extract compound corrosion inhibitor

[0052] Tea seed shell extract compound corrosion inhibitor formula:

[0053] Tea seed husk extract 20-40%, bisimidazoline quaternary ammonium salt 7.0-13.0%, dimethyl ketoxime 1.0-3.0%, sodium alkylbenzene sulfonate 0.75-1.25%, EDTA disodium salt 2.0-4.0% , and the balance is high-purity water.

[0054] Optimum formula of pickling compound corrosion inhibitor for thermal equipment, including 30.0% by weight tea seed hull extract, 10.0% bis-imidazoline quaternary ammonium salt, 2.0% dimethyl ketoxime, 1.0% sodium alkylbenzene sulfonate, EDTA disodium salt 3.0%, and the balance is high-purity water.

[0055] Based on the optimal formula of the compound corrosion inhibitor, the lotion is formulated at a weight ratio of 1:99 between the compound corrosion inhibitor and 5% hydrochloric acid solution (also known as pickling solution), while keeping the tea seeds in the pickling solution The concentration of th...

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Abstract

The invention discloses a pickling compound corrosion inhibitor for thermal equipment and a preparation method thereof. The compound corrosion inhibitor is prepared from a tea seed shell ethanol extract, quaternary ammonium bis-imidazoline, acetone oxime, sodium alkyl benzene sulfonate, and an EDTA disodium salt. The compound corrosion inhibitor has a good corrosion inhibition effect in the temperature range of a hydrochloric acid pickling technology for the thermal equipment, and the corrosion inhibition rate can reach 96%.

Description

technical field [0001] The invention belongs to the fields of electric power equipment and chemistry, and in particular relates to a pickling compound corrosion inhibitor for thermal equipment and a preparation method thereof, in particular to a preparation method of tea seed shell acetic acid extract, which is an important component thereof. Background technique [0002] The pickling of thermal equipment in power plants is an important technical guarantee measure to ensure the cleaning of the heating surface, improve the quality of steam and water at the start-up of the unit, slow down the corrosion and scaling of thermal equipment, and ensure the safe and economical operation of the unit. It is also one of the effective measures to improve the thermal efficiency of the boiler and the water vapor quality of the unit. one. Corrosion inhibitor is an important guarantee to reduce the corrosion of pickling objects in the pickling process, but the environmental pollution caused ...

Claims

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Application Information

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IPC IPC(8): C23G1/06C23G1/08
CPCC23G1/063C23G1/08Y02P20/10
Inventor 梅其政
Owner CHONGQING ELECTRIC POWER COLLEGE
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