Preparation method of indigo carmine/triethanolamine compounded corrosion inhibitor for 1045 carbon steel hydrochloric acid pickling solution

The technology of sodium indigo disulfonate and triethanolamine is applied in the field of preparation of sodium indigo disulfonate compound corrosion inhibitor, which can solve the problems of difficulty in indigo and limit the application of indigo, and achieves low cost, inhibition of corrosion rate and wide application. Foreground effect

Inactive Publication Date: 2015-10-07
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the highly symmetric molecular structure of indigo, indigo is insoluble in water, which severely limits the application of indigo in the field of corrosion inhibitors.

Method used

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  • Preparation method of indigo carmine/triethanolamine compounded corrosion inhibitor for 1045 carbon steel hydrochloric acid pickling solution
  • Preparation method of indigo carmine/triethanolamine compounded corrosion inhibitor for 1045 carbon steel hydrochloric acid pickling solution
  • Preparation method of indigo carmine/triethanolamine compounded corrosion inhibitor for 1045 carbon steel hydrochloric acid pickling solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Measure 42.5 mL of analytically pure concentrated hydrochloric acid with a graduated cylinder and dilute to 1 L with distilled water to prepare an HCl corrosion solution with a solubility of 0.5 mol / L.

[0024] (2) First weigh 0.4665 g of analytically pure sodium indigo disulfonate and dissolve it in 100 mL of 0.5 mol / L HCl solution prepared in step (1), and add 0.2984 g of analytically pure triethanolamine under slow stirring to obtain analytically pure indigo The molar ratio of sodium disulfonate to analytically pure triethanolamine is 1:2. After fully dissolving and standing for 2 hours, use a 200 mL volumetric flask to prepare 0.5 mol / L HCl solution to prepare 200 mL of indigo disulfide. The sodium sulfonate / triethanolamine compound corrosion inhibitor is a corrosion solution with a solubility of 0.005 mol / L.

[0025] (3) At room temperature, the epoxy resin is encapsulated and the exposed area at one end is 0.5024 cm 2， A 1045 carbon steel rod connected by a c...

Embodiment 2

[0028] (1) Measure 42.5 mL of analytically pure concentrated hydrochloric acid with a graduated cylinder and dilute to 1 L with distilled water to prepare an HCl corrosion solution with a solubility of 0.5 mol / L.

[0029] (2) First weigh 0.0933 g of analytically pure sodium indigo disulfonate and dissolve it in 100 mL of 0.5 mol / L HCl solution prepared in step (1), and add 0.0597 g of analytically pure triethanolamine under slow stirring to obtain analytically pure indigo The molar ratio of sodium disulfonate to analytically pure triethanolamine is 1:2, and after fully dissolving, use a 200 mL volumetric flask to carry out constant volume with the prepared 0.5 mol / L HCl solution to prepare 200 mL of indigo sodium disulfonate / The triethanolamine compound corrosion inhibitor is a corrosion solution with a solubility of 0.001 mol / L.

[0030] (3) At room temperature, the epoxy resin is encapsulated and the exposed area at one end is 0.5024 cm 2，A 1045 carbon steel rod connected ...

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Abstract

The invention discloses a preparation method of an indigo carmine/triethanolamine compounded corrosion inhibitor for 1045 carbon steel hydrochloric acid pickling solution. The preparation method comprises the following steps of firstly, measuring 42.5mL of analytically pure concentrated hydrochloric acid by using a measuring cylinder, diluting the analytically pure concentrated hydrochloric acid with distilled water to 1L, and preparing HCl corrosive solution with the solubility of 0.5mol/l; secondly, measuring analytically pure indigo carmine with the mass of 0.0093 to 0.9327g first, dissolving the analytically pure indigo carmine into 100mL of 0.5mol/L HCl solution obtained in the first step, adding 0.0060 to 0.5968g of analytically pure triethanolamine with the mole ratio of 1:2 by slowly stirring, wherein the mole ratio of the analytically pure indigo carmine to the analytically pure triethanolamine is (1:1) to (1:3), fully dissolving the analytically pure triethanolamine into the mixed solution, standing the mixed solution for 2 hours, and then using the prepared 0.5mol/L HCl solution to fix the volume by adopting a 200ml volumetric flask. The indigo carmine/triethanolamine compounded corrosion inhibitor disclosed by the invention can be used for inhibiting the corrosion rate of 1045 carbon steel in a pickling technology, and also has great solubility in water; the indigo carmine/triethanolamine compounded corrosion inhibitor has the advantages of simpleness in operation, low cost, green and environmental protection.

Description

technical field [0001] The invention relates to a preparation method of an indigo sodium disulfonate / triethanolamine compound corrosion inhibitor suitable for 1045 carbon steel hydrochloric acid pickling solution. In particular, it relates to a compound sodium indigo disulfonate inhibitor which significantly improves the corrosion inhibition performance of sodium indigo disulfonate on 1045 carbon steel in 0.5 mol / L HCl solution by compounding organic substances with cationic properties. Method of preparation of etchant. Background technique [0002] Corrosion inhibitor, as a chemical substance or a mixture of several chemical substances that exists in the environment (medium) in an appropriate concentration and form and can prevent or slow down corrosion. Often adding a small amount or a small amount of corrosion inhibitor can significantly reduce the corrosion rate of the metal material in the medium until it reaches zero, while keeping the original properties of the metal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23G1/06C23G1/08
Inventor 张哲田宁郴李秀莹黄堰
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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