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
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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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