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Hydrochloric acid composite corrosion inhibitor

A composite corrosion inhibitor and composite agent technology, applied in the field of composite corrosion inhibitors, can solve the problems of not meeting the requirements of pickling, unstable performance, strong pungent odor, etc., and achieve low toxicity, strong scale dissolution ability, The effect of chemical stability

Active Publication Date: 2014-03-19
江苏锁龙消防科技股份有限公司
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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 hydrochloric acid;

[0029] 0.05 kg of 2-phenylimidazoline quaternary ammonium salt;

[0030] Potassium iodide 0.05 kg;

[0031] 0.08 kg of triethanolamine;

[0032] Fatty alcohol polyoxyethylene ether 0.02 kg;

[0033] Alkylphenol polyoxyethylene ether 0.016 kg;

[0034] Water 96.784 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 irrelevant to cleaning, heat up to about 52°C, add the hydrochloric acid composite corrosion inhibitor of the present invention, and keep circulating at this temperature, The time is controlled at 4-6 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 0.4g / m2 h, and will not produce needle-like pitting or expand and deepen the original corrosion spo...

Embodiment 2

[0041] Raw material preparation:

[0042] 6 kg of hydrochloric acid;

[0043] 0.15 kg of 2-phenylimidazoline quaternary ammonium salt;

[0044] Potassium iodide 0.11 kg;

[0045] 0.12 kg of triethanolamine;

[0046] Fatty alcohol polyoxyethylene ether 0.04 kg;

[0047] Alkylphenol polyoxyethylene ether 0.024 kg;

[0048] Water 93.556 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 irrelevant to cleaning, heat up to about 52°C, add the hydrochloric acid composite corrosion inhibitor of the present invention, and keep circulating at this temperature, The time is controlled at 4-6 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 0.18g / m 2 h, no needle-like pitting corrosion or enlargement and deepening of the original corrosio...

Embodiment 3

[0054] Raw material preparation:

[0055] 7 kg of hydrochloric acid;

[0056] 0.35 kg of 2-phenylimidazoline quaternary ammonium salt;

[0057] Potassium iodide 0.17 kg;

[0058] 0.15 kg of triethanolamine;

[0059] Fatty alcohol polyoxyethylene ether 0.05 kg;

[0060] Alkylphenol polyoxyethylene ether 0.027 kg;

[0061] Water 92.253 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 irrelevant to cleaning, heat up to about 52°C, add the hydrochloric acid composite corrosion inhibitor of the present invention, and keep circulating at this temperature, The time is controlled at 4-6 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 0.18g / m2 h, and will not produce needle-like pitting or expand and deepen the original corrosion sp...

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Abstract

The invention discloses a hydrochloric acid composite corrosion inhibitor which is characterized in that the composite corrosion inhibitor comprises the following components by mass percent: 3-7% of hydrochloric acid; 0.05-0.35% of 2-phenyl imidazoline quaternary ammonium salt; 0.05-0.17% of potassium iodide; 0.08-0.15% of triethanolamine; 0.02-0.05% of fatty alcohol polyoxyethylene ether; 0.016-0.027% of alkylphenol polyoxyethylene ether; and the balance of water. According to the invention, the used 2-phenyl imidazoline quaternary ammonium salt belongs to an environment friendly product, is stable in chemical properties and low in toxicity. With the synergistic effect among corrosion inhibitors, the corrosion inhibition effect and the applicability are good; corrosion inhibition effect is achieved with only a few amount of the composite corrosion inhibitor; the waste liquid has no offensive odor, is low in toxicity, and meets the discharge standards.

Description

technical field [0001] The invention relates to a composite corrosion inhibitor, in particular to a hydrochloric 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 hydrochloric acid composite corrosion inhibitor, which is characterized in that the composite corrosion inhi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F11/04C23G1/06
Inventor 张明
Owner 江苏锁龙消防科技股份有限公司
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