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A kind of sulfamic acid rust removing liquid and rust removing method using the same

The technology of sulfamic acid and rust removal liquid is applied in the field of metal surface pretreatment, which can solve the problems of polluting the environment and difficult to handle, and achieves the effects of high cleaning capacity, fast cleaning speed, and reducing the cost of storage and transportation procedures.

Active Publication Date: 2022-07-01
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main component is hydrochloric acid, which is volatile and pollutes the environment, and the waste acid produced is difficult to handle and belongs to hazardous waste

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] This embodiment provides a sulfamic acid rust remover and a rust removal method using the same. The sulfamic acid rust remover includes, in terms of mass fraction: 20% of sulfamic acid, 3% of sodium chloride, and 3% of citric acid. %, tartaric acid 3%, complexing agent 1% (humic acid 0.3%, aminotrimethylene phosphate 0.3%, sodium gluconate 0.4%), penetrant 1% (sodium petroleum sulfonate 0.6%, fatty alcohol polyoxyethylene ether 0.4%), corrosion inhibitor 0.5% (thiourea 0.3%, benzotriazole 0.2%), anionic surfactant 0.5% (sodium dodecyl sulfonate 0.3%, sodium dodecyl sulfate 0.2% ), the balance is water.

[0041] Using the rust removal method of the sulfamic acid rust remover, a cleaning solution is prepared according to the mass percentage content, and the heavily rusted metal workpiece is cleaned with the cleaning solution, and then rinsed with water;

[0042] Wherein, the cleaning time is 15min, and the surface is clean and free of residues after cleaning.

Embodiment 2

[0044] This embodiment provides a sulfamic acid rust remover and a rust removal method using the same. The sulfamic acid rust remover includes, in mass fraction, 15% of sulfamic acid, 2% of potassium chloride, and 2% of citric acid. %, tartaric acid 2%, complexing agent 0.6% (humic acid 0.2%, diethylenetriaminepentamethylenephosphonic acid 0.2%, disodium edetate 0.2%), penetrating agent 0.6% (fatty alcohol polymer Oxyethylene ether 0.3%, cyclohexanone 0.3%), corrosion inhibitor 0.4% (thiourea 0.2%, benzotriazole 0.2%), anionic surfactant 4% (sodium dodecyl sulfonate 0.2%, sodium dodecyl sulfate 0.2%), the balance is water.

[0045] Utilize the rust removal method of the sulfamic acid rust removal solution, configure the cleaning solution according to the mass percentage content, and use the cleaning solution to clean the heavily rusted metal workpiece, and then rinse with water;

[0046] Wherein, the cleaning time is 10min, and the surface is clean and no residue after cleani...

Embodiment 3

[0048] This embodiment provides a sulfamic acid rust remover and a rust removal method using the same. The sulfamic acid rust remover includes, in mass fraction, 10% of sulfamic acid, 1.5% of potassium chloride, and 1.5% of citric acid. %, tartaric acid 1.5%, complexing agent 0.5% (humic acid 0.1%, hydroxyethylidene diphosphonic acid 0.2%, disodium edetate 0.1%), penetrant 0.4% (fatty alcohol polyoxyethylene ether 0.2% %, acylacetone 0.2%), corrosion inhibitor 0.3% (thiourea 0.1%, benzotriazole 0.2%), anionic surfactant 0.3% (sodium dodecyl sulfonate 0.2%, dodecyl sulfate Sodium 0.1%), the balance is water.

[0049] Utilize the rust removal method of the sulfamic acid rust removal solution, configure the cleaning solution according to the mass percentage content, and use the cleaning solution to clean the heavily rusted metal workpiece, and then rinse with water;

[0050] Wherein, the cleaning time is 12 minutes, and the surface is clean and free of residues after cleaning. ...

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PUM

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Abstract

The present invention relates to this embodiment and provides a sulfamic acid rust remover and a rust removal method using the same. The rust removal solution includes the following components in terms of mass fraction: 5-20% of sulfamic acid, 1-1% of chloride salt 3%, citric acid 1-3%, tartaric acid 1-3%, auxiliary agent 0.6-2.5%, anionic surfactant 0.2-0.5%, and the balance is water. The sulfamic acid rust removing solution provided by the present invention realizes the improvement of the performance of the sulfamic acid-based rust removing solution through the synergistic effect among chloride salt, citric acid, tartaric acid and anionic surfactant, and realizes the improvement of ordinary carbon steel and Low alloy steel achieves good cleaning results, high cleaning capacity, fast cleaning speed and long service life.

Description

technical field [0001] The invention relates to the field of metal surface pretreatment, in particular to a sulfamic acid rust removing solution and a rust removing method utilizing the same. Background technique [0002] At present, the metal surface pickling pretreatment industry has formed a trillion-dollar industrial scale in the country, but the existing technology is still far behind developed countries. Hydrochloric acid and sulfuric acid are the two most commonly used chemical cleaning media in the existing process, causing serious environmental pollution. , The major technical drawbacks that endanger human health, the overall equipment technology, pollution control and internal environmental management level of the industry need to be improved urgently. Especially in the situation that the relevant national environmental protection laws and regulations are becoming more and more stringent, some pickling enterprises are already facing an emergency situation of life a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23G1/06C23G1/08
CPCC23G1/06C23G1/068C23G1/065C23G1/088
Inventor 陈运法仉小猛王延华杜英超于博叶树峰魏连启
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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