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Sulfamic acid rust removing liquid and rust removing method using same

A technology of sulfamic acid and derusting liquid, which is applied in the field of metal surface pretreatment, can solve problems such as polluted environment and difficult to deal with, and achieve the effect of high content, fast cleaning speed and improved cleaning capacity

Active Publication Date: 2020-09-22
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 kind of sulfamic acid derusting agent and its derusting method, said sulfamic acid derusting agent comprises in terms of mass fraction: sulfamic acid 20%, sodium chloride 3%, citric acid 3% %, tartaric acid 3%, complexing agent 1% (humic acid 0.3%, amino trimethylene phosphoric acid 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 dodecylsulfonate 0.3%, sodium lauryl sulfate 0.2% ), and the balance is water.

[0041] Utilize the rust removal method of the sulfamic acid rust remover, configure a cleaning solution according to the mass percentage content, clean the heavily rusted metal workpiece with the cleaning solution, and then rinse it with water;

[0042] Wherein, the cleaning time is 15 minutes, and the surface is smooth without residue after cleaning.

Embodiment 2

[0044] This embodiment provides a kind of sulfamic acid derusting agent and its derusting method, and the sulfamic acid derusting solution comprises in mass fraction: 15% of sulfamic acid, 2% of potassium chloride, 2% of citric acid %, tartaric acid 2%, complexing agent 0.6% (humic acid 0.2%, diethylene triamine pentamethylene phosphonic acid 0.2%, edetate disodium 0.2%), penetrant 0.6% (fatty alcohol poly Oxyethylene ether 0.3%, cyclohexanone 0.3%), corrosion inhibitor 0.4% (thiourea 0.2%, benzotriazole 0.2%), anionic surfactant 4% (sodium dodecylsulfonate 0.2%, sodium lauryl sulfate 0.2%), and the balance is water.

[0045] Using the derusting method of the sulfamic acid derusting solution, configuring a cleaning solution according to the mass percentage content, cleaning the heavily rusted metal workpiece with the cleaning solution, and then rinsing with water;

[0046] Wherein, the cleaning time is 10 minutes, and the surface is smooth without residue after cleaning.

Embodiment 3

[0048] This embodiment provides a sulfamic acid derusting agent and a derusting method using the same. The sulfamic acid derusting solution includes, by mass fraction: 10% sulfamic acid, 1.5% potassium chloride, 1.5% citric acid %, tartaric acid 1.5%, complexing agent 0.5% (humic acid 0.1%, hydroxyethylidene diphosphonic acid 0.2%, edetate disodium 0.1%), penetrant 0.4% (fatty alcohol polyoxyethylene ether 0.2%) %, acetylacetone 0.2%), corrosion inhibitor 0.3% (thiourea 0.1%, benzotriazole 0.2%), anionic surfactant 0.3% (sodium dodecylsulfonate 0.2%, lauryl sulfate Sodium 0.1%), the balance is water.

[0049] Using the derusting method of the sulfamic acid derusting solution, configuring a cleaning solution according to the mass percentage content, cleaning the heavily rusted metal workpiece with the cleaning solution, and then rinsing with water;

[0050] Wherein, the cleaning time is 12 minutes, and the surface is smooth without residue after cleaning.

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PUM

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Abstract

The embodiment of the invention provides sulfamic acid rust removing liquid and a rust removing method using the same. The rust removing liquid is prepared from following components in percent by mass: 5%-20% of sulfamic acid, 1%-3% of chlorine salt, 1%-3% of citric acid, 1%-3% of tartaric acid, 0.6%-2.5% of an assistant, 0.2%-0.5% of an anionic surfactant and the balance water. According to the sulfamic acid rust removing liquid, the performance of the rust removing liquid with the sulfamic acid as a body is improved through the synergistic effect of the chlorine salt, the citric acid, the tartaric acid and the anionic surfactant, a good washing effect on plain carbon steel and low-alloy steel is achieved, the washing capacity is high, the washing speed is high, and the service life is long.

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 Applications(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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