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Preparation method of ergometrine acid-pickling inhibitor

A technology of ergometrine and alkali pickling, which is applied in the field of pickling corrosion inhibitors, can solve the problems of acid corrosion, deterioration of working conditions, hydrogen embrittlement of cleaned equipment, etc., and achieve the effect of wide source and environmental friendliness

Active Publication Date: 2018-07-24
湖北精瑜材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since acid has a corrosive effect on metal equipment, especially the corrosion of inorganic acid is more serious, and the hydrogen gas released will diffuse into the metal, causing hydrogen embrittlement of the equipment to be cleaned.
In addition, since the on-site pickling temperature is mostly at 80°C, a large amount of acid gas will be volatilized in the pickling solution, which will deteriorate the working conditions.

Method used

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  • Preparation method of ergometrine acid-pickling inhibitor
  • Preparation method of ergometrine acid-pickling inhibitor

Examples

Experimental program
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Effect test

Embodiment 1

[0025] After heating the acidic solution to 80°C, slowly add ergonovine, stir and reflux at 80°C for 0.5h, wait for the temperature to drop to room temperature, and then add an appropriate amount of solubilizer to obtain the pickling corrosion inhibitor. Wherein the mass ratio of ergometrine and the solubilizing agent is 20:5, the mass of the solvent accounts for 75% of the total mass, and the concentration of formic acid is 10%.

Embodiment 2

[0027] After heating the acidic solution to 80°C, slowly add ergonovine, stir and reflux at 80°C for 0.5h, wait for the temperature to drop to room temperature, and then add an appropriate amount of solubilizer to obtain the pickling corrosion inhibitor. Wherein the mass ratio of ergometrine and the solubilizing agent is 25:7, the mass of the solvent accounts for 68% of the total mass, and the concentration of formic acid is 12%.

Embodiment 3

[0029] After heating the acidic solution to 80°C, slowly add ergonovine, stir and reflux at 80°C for 0.5h, wait for the temperature to drop to room temperature, and then add an appropriate amount of solubilizer to obtain the pickling corrosion inhibitor. Wherein the mass ratio of ergometrine and solubilizer is 30:8, the mass of the solvent accounts for 62% of the total mass, and the concentration of propionic acid is 13%.

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Abstract

The invention discloses a preparation method of an ergometrine acid-pickling inhibitor. The preparation method of the ergometrine acid-pickling inhibitor comprises the following steps: increasing thetemperature of an acid solution to 60-80 DEG C, slowly adding ergometrine, stirring and carrying out reflux reaction for 0.5-4 hours under the temperature condition, reducing the temperature to room temperature, then adding a proper quantity of solubilizer to obtain the acid-pickling inhibitor, wherein the acid used in the acid solution is selected from one or several of formic acid, acetic acid and propionic acid; the solubilizer is selected from one or several of triton X-100, OP-10 and coconut oil fatty acid diethanolamide. The invention relates to the field of the acid-pickling inhibitors.The inhibitor has the characteristics of high corrosion inhibition performance, wide raw material resources and degradability under natural condition, has a good market prospect, and is high in dissolubility in the acid solution; the inhibition rate can reach 80% or above; compared with the similar inhibitor, the surfaces of steel plates after being subjected to acid pickling are uniformly corroded; the treatment of various surface processes in the later period can be facilitated.

Description

technical field [0001] The invention relates to the field of pickling corrosion inhibitors, in particular to provide a preparation method of ergometrine pickling corrosion inhibitors. Background technique [0002] The method of using an acid solution to remove scale and rust on the steel surface is called pickling. It is a method of cleaning metal surfaces. Commonly used acids for pickling include inorganic acids such as hydrochloric acid, sulfuric acid, phosphoric acid, hydrofluoric acid, and sulfamic acid, and organic acids such as citric acid and EDTA. However, since acid has a corrosive effect on metal equipment, especially the corrosion of inorganic acid is more serious, and the released hydrogen will diffuse into the metal, causing hydrogen embrittlement of the equipment to be cleaned. In addition, because the on-site pickling temperature is mostly at 80°C, a large amount of acid gas will be volatilized in the pickling solution, which will deteriorate the working con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23G1/06C23G1/08
Inventor 周锰董鹏飞杨普生赵仁君何金杯
Owner 湖北精瑜材料有限公司