Preparation and application of neutral non-phosphorus rust remover

A rust remover and neutral technology, which is applied in the preparation and application field of neutral phosphorus-free rust remover, can solve the problems of secondary attachment to contaminated workpieces, high labor intensity, and large dust pollution, and achieve simplified bath maintenance, Reduce secondary pollution, good rust removal effect

Inactive Publication Date: 2017-09-01
杭州五源科技实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conventional mechanical rust removal (grinding, sandblasting, etc.) has high labor intensity and dust pollution, making it difficult to carry out large-scale flow operations; while traditional strong acid (hydrochloric acid, sulfuric acid, etc.) Equipment, health and the environment pose a great hazard
Neutral rust remover is a kind of novel chemical rust remover material at present, as CN03146767, CN201410171064, CN201510579235, CN201611179917, neutral rust remover described in multiple patents such as CN201611080234, has adopted inorganic phosphate or organic phosphonic acid compound ( Such as hydroxyethylidene diphosphonic acid, aminotrimethylene phosphonic acid, etc.), although the purpose of neutral rust removal has also been achieved, there is still a certain degree of inter-process rust prevention after the workpiece is processed, and its treatment solution contains phosphorus. The waste water still needs to be further treated; as described in patents such as CN201310646506 and CN201510053544, the neutral phosphorus-free rust preventive agent is likely to generate a large amount of foam in the spray treatment process and even overflow the production equipment due to the surfactant used, and the foam is easy to induce rust removal The generated slag is entrained, causing secondary adhesion to pollute the workpiece and affecting subsequent production

Method used

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  • Preparation and application of neutral non-phosphorus rust remover
  • Preparation and application of neutral non-phosphorus rust remover

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A) Based on 100 parts by weight, add 70 parts of water to the stirring tank, dissolve and mix tartaric acid and potassium sodium tartrate mixture (the two are mixed at 10:1, 15 parts), sodium polyacrylate (7.5 parts), Monoethanolamine (1 part), 2-imidazolidinone (0.2 part) and thiourea (1 part), after stirring and clarification, adjust the pH value of the solution to 6.5 with 0.2 part of sodium bicarbonate, and finally add the remaining water and stir evenly.

[0022] B) The neutral phosphorus-free rust remover prepared in step A) is used to treat the barrel of the rusty filter by immersing it at room temperature (37°C) for about 0.5-1.5min; the floating rust on the surface (including processing Hand sweat during the process will cause rust).

Embodiment 2

[0024] A) Based on 100 parts by weight, add 50 parts of water to the stirring tank, dissolve and mix citric acid (25 parts), maleic acid-acrylic acid copolymer (10 parts), monoethanolamine, triethanolamine and triethanolamine respectively as required Borate ester mixture (the three are mixed at a ratio of 1:1:6, 5 parts), N,N-dimethylallyl urea (0.5 part) and sodium gluconate (5 parts), after stirring and clarification, use 12.5 parts of hydroxide Adjust the pH value of the solution to 6.1 with sodium, and finally add the remaining water and stir evenly.

[0025] B) The neutral phosphorus-free derusting agent prepared in step A) is used to treat rusty steel sheet metal parts by immersing them at room temperature (5°C) for about 15-20 minutes; the rust on the surface can be removed, and the workpiece can be processed and produced No secondary corrosion phenomenon.

Embodiment 3

[0027] A) Based on 100 parts by weight, add 60 parts of water to the stirring tank, dissolve and mix oxalic acid (20 parts), polyaspartic acid (5 parts), monoethanolamine (3 parts), and dimethylimidazole respectively as required Linone (0.1 part) and sodium gluconate (2 parts), after stirring and clarification, adjust the pH value of the solution to 6.7 with 9.5 parts of sodium carbonate, and finally add the remaining amount of water and stir evenly.

[0028] B) The neutral phosphorus-free derusting agent prepared in step A) is used to treat the rod-shaped steel workpiece with rust by spraying it at room temperature (25°C) for about 1.0-1.8min; the rust on the surface can be removed, and the subsequent descaling There is no secondary corrosion on the workpiece in the oil process.

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PUM

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Abstract

The invention discloses preparation and application of a neutral non-phosphorus rust remover. The rust remover mainly comprises a chelating agent, a polymer, a corrosion inhibitor, a penetrant, a pH regulator, water and an assistant, and can be applied to phosphorization, chromizing and silanization of coating pretreatment of steel and iron workpieces or zirconium pretreatment and rusty workpiece derusting procedure before chemical conversion coating treatment. According to the rust remover, treatment time is flexible, the rust remover is utilized at the normal temperature, does not need to be heated, can be utilized for treatment in a spraying or impregnation manner, does not contain hazardous substances like phosphorus, and is low in residues and free of scales, after rust removing, a solution is low in bubble and scale, maintenance of a bath solution is simplified, residues and scales are not liable to adhere to the workpieces and pollute the workpieces, the pH of a treating fluid is neutral, workpiece matrixes and operation equipment are not corroded and damaged, the workpieces have good corrosion inhibition and rust protection performance after treatment, and the rust protection problem of the workpieces during the transfer process is solved.

Description

technical field [0001] The invention relates to a treatment technology for steel surface protection, in particular to the preparation and application of a neutral phosphorus-free rust remover. [0002] technical background [0003] Steel is the most widely used metal material in various fields in the world. During its manufacture, production, processing and use, it will inevitably cause damage and corrosion in different degrees and forms due to the influence of surrounding environmental media, resulting in economical The losses are countless. [0004] In coating production, removing rust on the surface of steel workpieces is a necessary process in the pre-coating process. Conventional mechanical rust removal (grinding, sandblasting, etc.) has high labor intensity and dust pollution, making it difficult to carry out large-scale flow operations; while traditional strong acid (hydrochloric acid, sulfuric acid, etc.) Equipment, health and the environment pose great hazards. Ne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23G1/26
CPCC23G1/26
Inventor 钟金环王一建
Owner 杭州五源科技实业有限公司
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