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Environment-friendly passivation solution for aluminum alloy and preparation method thereof

A technology of passivation solution and aluminum alloy, which is applied in the coating process of metal materials, can solve the problems of unsatisfactory corrosion resistance of passivation film, etc., and achieve remarkable passivation effect, convenient operation and good passivation effect

Inactive Publication Date: 2021-03-12
杨汉松
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The technical scheme of the passivation solution has a high fluorine content. Three fluorine-containing compounds are used, together with nitric acid and phytic acid, to form a passivation film on the surface of the aluminum alloy. Although the fluorine content is high, it is partially passivated The stability of the film is good, but affected by nitric acid, the corrosion resistance of the passivation film is not ideal, so it is not an ideal passivation solution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] An environment-friendly passivation solution for aluminum alloys, characterized in that it comprises the following components by mass percentage: 0.05% potassium hexafluorohafnate, 0.03% sodium fluoroborate, amphoteric organic ion trimethoxysilylpropyl polyurethane 0.06% of polymer, 0.01% of modified rare earth metal organic framework, and the balance is water.

[0033] The preparation method of the modified rare earth metal organic framework comprises the following steps: adding the rare earth metal organic framework to an organic solvent, and then adding N-(3-triethoxysilylpropyl)glucamide to it, and Stir at ℃ for 1 hour, and then remove the solvent by rotary evaporation to obtain a modified rare-earth metal-organic framework; the mass ratio of the rare-earth metal-organic framework, organic solvent, and N-(3-triethoxysilylpropyl)glucamide is 1:3:0.01; the organic solvent is ethanol.

[0034] The preparation method of described amphoteric organic ion trimethoxysilyl ...

Embodiment 2

[0041] An environmentally friendly passivation solution for aluminum alloys, characterized in that it includes the following components in mass percentage: 0.07% potassium hexafluorohafnate, 0.035% sodium fluoroborate, amphoteric organic ion trimethoxysilylpropyl polyurethane 0.08% of polymer, 0.012% of modified rare earth metal organic framework, and the balance is water.

[0042] The preparation method of the modified rare earth metal organic framework includes the following steps: adding the rare earth metal organic framework to an organic solvent, and then adding N-(3-triethoxysilylpropyl)glucamide to it, and at 55 Stirring at ℃ for 1.5 hours, and removing the solvent by rotary evaporation to obtain a modified rare earth metal organic framework; the mass ratio of the rare earth metal organic framework, organic solvent, and N-(3-triethoxysilylpropyl)glucamide is 1:3.5:0.015; the organic solvent is tetrahydrofuran.

[0043] The preparation method of described amphoteric org...

Embodiment 3

[0051] An environment-friendly passivation solution for aluminum alloys, characterized in that it comprises the following components by mass percentage: 0.08% potassium hexafluorohafnate, 0.04% sodium fluoroborate, amphoteric organic ion trimethoxysilylpropyl polyurethane 0.09% of polymer, 0.015% of modified rare earth metal organic framework, and the balance is water.

[0052] The preparation method of the modified rare earth metal organic framework comprises the following steps: adding the rare earth metal organic framework to an organic solvent, and then adding N-(3-triethoxysilylpropyl)glucamide to it, and Stir at ℃ for 2 hours, and then remove the solvent by rotary evaporation to obtain a modified rare-earth metal-organic framework; the mass ratio of the rare-earth metal-organic framework, organic solvent, and N-(3-triethoxysilylpropyl)glucamide is 1:4:0.02; the organic solvent is dichloromethane.

[0053] The preparation method of described amphoteric organic ion trimet...

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PUM

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Abstract

The invention discloses an environment-friendly passivation solution for an aluminum alloy. The environment-friendly passivation solution for the aluminum alloy is characterized by comprising the following components in percentage by mass: 0.05 to 0.11 percent of potassium hexafluorohafnium oxide, 0.03 to 0.05 percent of sodium fluoborate, 0.06 to 0.13 percent of amphoteric organic ion trimethoxysilylpropyl polyurethane polymer, 0.01 to 0.02 percent of modified rare earth metal organic framework and the balance of water. The invention further discloses a preparation method of the environment-friendly passivation solution for the aluminum alloy. The environment-friendly passivation solution for the aluminum alloy disclosed by the invention is remarkable in passivation effect, high in stability, uniform and compact in passivation film, high in corrosion resistance, good in environmental protection property, high in adhesive force and good in film forming property.

Description

technical field [0001] The invention relates to the technical field of metal material surface treatment, in particular to an environment-friendly passivation solution for aluminum alloys and a preparation method thereof. Background technique [0002] Because of its high specific strength, light weight, good thermal and electrical conductivity, beautiful color, non-magnetic, good plasticity, and no low-temperature brittleness, aluminum alloys are widely used in aerospace, mechanical equipment, transportation, home appliances, construction and other fields. . Its consumption is second only to steel, and is the second most used metal material in the industrial field. It is the most widely used and most used alloy in light alloys. Then, when the aluminum alloy is used in humid, industrial gas, fuel gas, salt and dust atmosphere environments, it is prone to damage in the form of pitting corrosion, crevice corrosion, stress corrosion and corrosion fatigue, which affects its conti...

Claims

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Application Information

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IPC IPC(8): C23C22/46C23C22/34
CPCC23C22/34C23C22/46
Inventor 杨汉松
Owner 杨汉松
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