Citric acid compound corrosion inhibitor

A composite corrosion inhibitor and citric acid technology, applied in the field of composite corrosion inhibitors, can solve the problems of not meeting the requirements of pickling, strong pungent odor, and unstable performance, etc., and achieve low toxicity, stable chemical properties, and solubility The effect of strong dirt ability

Inactive Publication Date: 2014-03-12
QINGDAO WINCHANCE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the performance of the existing corrosion inhibitors for boiler pickling is not stable enough, the shelf life is short, and there is a strong pungent smell
Due to the use of a single component as a corrosion inhibitor, it often fails to meet the requirements of pickling

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Raw material preparation:

[0028] 3 kg of citric acid;

[0029] 0.05 kg of 2-mercaptobenzimidazole;

[0030] Potassium iodide 0.08 kg;

[0031] 0.09 kg of triethanolamine;

[0032] Fatty alcohol polyoxyethylene ether 0.02 kg;

[0033] Alkylphenol polyoxyethylene ether 0.012 kg;

[0034] Water 96.748 kg.

[0035] Connect the boiler cleaning system, adjust the boiler water pressure to meet the requirements from the boiler water supply to the low water level of the steam drum, isolate the system that has nothing to do with cleaning, raise the temperature to about 95°C, add the citric acid composite corrosion inhibitor of the present invention, and keep circulating at this temperature , the time is controlled at 6-8 hours, and the pH of the pickling solution is adjusted to 4.0 with ammonia water.

[0036] After testing, the static corrosion rate in boiler steel is 0.66g / m2 h, and will not produce needle-like pitting or expand and deepen the original corrosion spots;...

Embodiment 2

[0041] Raw material preparation:

[0042] 5 kg of citric acid;

[0043] 2-mercaptobenzimidazole 0.9 kg;

[0044] Potassium iodide 0.15 kg;

[0045] 0.12 kg of triethanolamine;

[0046] Fatty alcohol polyoxyethylene ether 0.05 kg;

[0047] Alkylphenol polyoxyethylene ether 0.015 kg;

[0048] Water 93.765 kg.

[0049] Connect the boiler cleaning system, adjust the boiler water pressure to meet the requirements from the boiler water supply to the low water level of the steam drum, isolate the system that has nothing to do with cleaning, raise the temperature to about 95°C, add the citric acid composite corrosion inhibitor of the present invention, and keep circulating at this temperature , the time is controlled at 6-8 hours, and the pH of the pickling solution is adjusted to 4.0 with ammonia water.

[0050] After testing, the static corrosion rate in boiler steel is 0.66g / m 2 h, no needle-like pitting corrosion or enlargement and deepening of the original corrosion spots;...

Embodiment 3

[0054] Raw material preparation:

[0055] 3 kg of citric acid;

[0056] 0.05 kg of 2-mercaptobenzimidazole;

[0057] Potassium iodide 0.08 kg;

[0058] 0.09 kg of triethanolamine;

[0059] Fatty alcohol polyoxyethylene ether 0.02 kg;

[0060] Alkylphenol polyoxyethylene ether 0.012 kg;

[0061] Water 96.748 kg.

[0062] Connect the boiler cleaning system, adjust the boiler water pressure to meet the requirements from the boiler water supply to the low water level of the steam drum, isolate the system that has nothing to do with cleaning, raise the temperature to about 95°C, add the citric acid composite corrosion inhibitor of the present invention, and keep circulating at this temperature , the time is controlled at 6-8 hours, and the pH of the pickling solution is adjusted to 4.0 with ammonia water.

[0063] After testing, the static corrosion rate in boiler steel is 0.66g / m2 h, and will not produce needle-like pitting or expand and deepen the original corrosion spots;...

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PUM

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Abstract

The invention discloses a citric acid compound corrosion inhibitor which is characterized in that the compound corrosion inhibitor consists of the following components in percentage by mass: 3-10% of citric acid, 0.05-0.12% of 2-mercapto benzimidazole, 0.08-0.35% of potassium iodide, 0.09-0.15% of triethanolamine, 0.02-0.06% of fatty alcohol-polyoxyethylene ether, 0.012-0.019% of alkylphenol polyoxyethylene ether and the balance of water. In the citric acid compound corrosion inhibitor disclosed by the invention, the adopted 2-mercapto benzimidazole belongs to environment-friendly products and has stable chemical properties and low toxicity. Due to the synergistic effect between corrosion inhibitors, the corrosion inhibition effect and applicability are good, and the corrosion inhibition effect can be realized by adding a small amount of corrosion inhibitor; without stink, the waste liquid has low toxicity and meets the emission standard.

Description

technical field [0001] The invention relates to a composite corrosion inhibitor, in particular to a citric acid composite corrosion inhibitor. Background technique [0002] In recent years, the corrosion inhibitor for boiler pickling is a special corrosion inhibitor urgently needed in the chemical cleaning of boilers. However, the performance of the existing corrosion inhibitors for boiler pickling is not stable enough, the shelf life is short, and there is a strong pungent smell. Due to the use of a single component as a corrosion inhibitor, it often fails to meet the requirements of pickling. With the enhancement of human awareness of environmental protection, in the process of application and development of corrosion inhibitors, the development of low-toxicity corrosion inhibitors is emphasized. Contents of the invention [0003] The invention discloses a citric acid composite corrosion inhibitor, which is characterized in that the composite corrosion inhibitor consis...

Claims

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Application Information

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IPC IPC(8): C23G1/06
Inventor 苏建丽
Owner QINGDAO WINCHANCE TECH
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