Alkaline passivation solution

A passivation solution, alkaline technology, applied in the direction of metal material coating process, etc., can solve the problems of poor resistance to salt spray, residual acidic substances, easy overreaction, etc., to achieve excellent alkali resistance, extended service life, corrosion resistance, etc. less damage

Inactive Publication Date: 2017-03-22
粟飞
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The traditional acidic cleaning passivation solution is composed of organic acids, antioxidants, stabilizers and complexing agents, etc. The workpiece is easily over-reacted when soaked in the acidic passivation solution, causing corrosion spots on the workpiece. Acidic substances remain after soaking, so the workpiece needs to be neutralized after acid passivation treatment.
And after the workpiece is soaked in acidic passivation solution, white corrosion spots will appear within 24 hours of the salt spray resistance test, and the salt spray resistance effect is poor, and at least two or more blue spots appear on the workpiece after soaking in acidic passivation solution. point

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] An alkaline passivation solution, consisting of the following components by weight: benzotriazole: 4%, potassium hydroxide: 1.6%, sodium metasilicate pentahydrate: 1.9%, pentasodium phosphate: 4%, EDTA four Sodium: 0.3%, Monoethanolamine: 0.5%, Fatty Alcohol Ethoxylates: 9% and Deionized Water: 78.7%.

[0032] The production method of the alkaline passivation solution is as follows: Step 1: first pour 2 / 5 of the above-mentioned deionized water in the weight ratio into the reaction tank, then add potassium hydroxide to the reaction tank and stir, and the stirring speed is controlled to 42 Turn / min, stir until the potassium hydroxide is completely dissolved.

[0033] Step 2: Add benzotriazole into the reaction barrel, control the stirring speed to 70 rpm, stir until the benzotriazole is completely dissolved to obtain a mixed solution, and when the mixed solution in the reaction barrel becomes clear, add 2 / 5 Deionized water of the above weight ratio was added to the reac...

Embodiment 2

[0044] An alkaline passivation solution, composed of the following components by weight: benzotriazole: 3.5%, potassium hydroxide: 1.7%, sodium metasilicate pentahydrate: 2%, pentasodium phosphate: 3.5%, EDTA four Sodium: 0.4%, Monoethanolamine: 0.5%, Fatty Alcohol Ethoxylates: 8.5%, and Deionized Water: 79.9%.

[0045] The production method of the alkaline passivation solution is as follows: Step 1: first pour 2 / 5 of the above-mentioned deionized water in the weight ratio into the reaction tank, then add potassium hydroxide to the reaction tank and stir, and the stirring speed is controlled to 42 Turn / min, stir until the potassium hydroxide is completely dissolved.

[0046] Step 2: Add benzotriazole into the reaction barrel, control the stirring speed to 70 rpm, stir until the benzotriazole is completely dissolved to obtain a mixed solution, and when the mixed solution in the reaction barrel becomes clear, add 2 / 5 Deionized water of the above weight ratio was added to the r...

Embodiment 3

[0057] An alkaline passivation solution, composed of the following components by weight: benzotriazole: 3.5%, potassium hydroxide: 1.7%, sodium metasilicate pentahydrate: 2%, pentasodium phosphate: 3.5%, EDTA four Sodium: 0.4%, Monoethanolamine: 0.5%, Fatty Alcohol Ethoxylates: 8.5%, and Deionized Water: 79.9%.

[0058] The production method of the alkaline passivation solution is as follows: Step 1: first pour 2 / 5 of the above-mentioned deionized water in the weight ratio into the reaction tank, then add potassium hydroxide to the reaction tank and stir, and the stirring speed is controlled to 42 Turn / min, stir until the potassium hydroxide is completely dissolved.

[0059] Step 2: Add benzotriazole into the reaction barrel, control the stirring speed to 70 rpm, stir until the benzotriazole is completely dissolved to obtain a mixed solution, and when the mixed solution in the reaction barrel becomes clear, add 2 / 5 Deionized water of the above weight ratio was added to the r...

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PUM

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Abstract

The invention discloses an alkaline passivation solution. The alkaline passivation solution is composed of, by weight percentage, 3%-5% of benzotriazole, 1.5%-1.9% of potassium hydroxide, 1.8%-2.2% of sodium metasilicate pentahydrate, 3%-5% of pentasodium phosphate, 0.25%-0.5% of tetrasodium EDTA, 0.5% of monoethanolamine, 8%-10% of fatty alcohol-polyoxyethylene ether and 74.9%-81.95% of deionized water. The alkaline passivation solution is excellent in alkali resistance. An immersed workpiece does not need neutralization operation; in the using process of the alkaline passivation solution, the original size and glossiness of a stainless steel part cannot be changed; the circumstance that the alkaline passivation solution reacts with the stainless steel part to generate toxic substances cannot occur; the alkaline passivation solution does not contain phosphorus or organic pollutants or various types of heavy metal or toxic substances or irritative and volatile substances, and the working environment of operators is greatly improved; the alkaline passivation solution meets requirements of WEEE&RoHS directives of the European Union; cleaning efficiency is high; the alkaline passivation solution can be used repeatedly; production cost is lowered; corrosion encroachment against a container is small; the service life of the container can be prolonged, and salt mist resisting time of the stainless steel part is effectively prolonged; and the effect is remarkable.

Description

technical field [0001] The invention relates to a stainless steel passivation treatment process, in particular to an alkaline passivation solution. Background technique [0002] The traditional acidic cleaning passivation solution is composed of organic acids, antioxidants, stabilizers and complexing agents, etc. The workpiece is easily over-reacted when soaked in the acidic passivation solution, causing corrosion spots on the workpiece. Acidic substances remain after soaking, so the workpiece needs to be neutralized after acidic passivation treatment. And after the workpiece is soaked in acidic passivation solution, white corrosion spots will appear within 24 hours of the salt spray resistance test, and the salt spray resistance effect is poor, and at least two or more blue spots appear on the workpiece after soaking in acidic passivation solution. point. Therefore, in view of the deficiencies of the above-mentioned problems in the current passivation treatment of stainle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/62
CPCC23C22/62
Inventor 粟飞
Owner 粟飞
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