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Aluminium alloy surface passivation solution replacing chromium passivation

A technology of aluminum alloy surface and passivation solution, applied in the direction of metal material coating process, etc., can solve the problems of pollution, secondary pollution of the environment, etc., and achieve the effect of saving money, short processing time, and improving the production environment

Inactive Publication Date: 2015-02-04
无锡永发电镀有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chromate passivation treatment can significantly improve the corrosion resistance of aluminum and its alloy surface. At the same time, the passivation film has good adhesion to the coating and is low in cost, so it has been widely used. However, chromate passivation treatment The solution contains hexavalent chromium, which is extremely harmful to the human body and the environment. Not only will pollution occur during the treatment process, but the hexavalent chromium in the passivation film will also cause secondary pollution to the environment when the treated product is used or discarded in the future.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] An aluminum alloy surface passivation solution that replaces chromium passivation, the composition of the passivation solution is calculated by weight percentage: 6% modified silicone resin, 26% polyurethane resin, 1% cerium nitrate, 5% ammonium persulfate, Sodium chloride 2%, silica gel 14%, sodium sulfide 3.5%, sodium dihydrogen phosphate 4%, nitric acid 6%, bis-[3-(triethoxy) silylpropyl] tetrasulfide 0.8%, the balance is water.

Embodiment 2

[0019] An aluminum alloy surface passivation solution that replaces chromium passivation. The composition of the passivation solution is: 8% modified silicone resin, 22% polyurethane resin, 2% cerium nitrate, 3% ammonium persulfate, Sodium chloride 4%, silica gel 12%, sodium sulfide 4.5%, sodium dihydrogen phosphate 2%, nitric acid 8%, bis-[3-(triethoxy) silylpropyl] tetrasulfide 0.6%, the balance is water.

Embodiment 3

[0021] An aluminum alloy surface passivation solution that replaces chromium passivation. The composition of the passivation solution is: 7% modified silicone resin, 24% polyurethane resin, 1.5% cerium nitrate, 4% ammonium persulfate, Sodium chloride 3%, silica gel 13%, sodium sulfide 4.0%, sodium dihydrogen phosphate 3%, nitric acid 7%, bis-[3-(triethoxy) silylpropyl] tetrasulfide 0.7%, the balance is water.

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PUM

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Abstract

The invention discloses an aluminium alloy surface passivation solution replacing chromium passivation. The passivation solution comprises, in percent by weight: 6-8% of modified organic silicon resin, 22-26% of polyurethane resin, 1-2% of cerium nitrate, 3-5% of ammonium persulfate, 2-4% of sodium chloride, 12-14% of silica gel, 3.5-4.5% of sodium sulfide, 2-4% of sodium dihydrogen phosphate, 6-8% of nitric acid, 0.6-0.8% of bis[3-(triethoxysilyl)propyl]tetrasulfide, and the balance water.

Description

technical field [0001] The invention relates to the technical field of surface treatment, in particular to an aluminum alloy surface passivation solution for substituting chromium passivation. Background technique [0002] Aluminum is one of the most abundant metal elements in nature. Because aluminum and its alloys have the advantages of small specific gravity, good thermal and electrical conductivity, strong light reflection, easy forming and processing, excellent physical and chemical properties, and low price, they are currently widely used. Used in electronic communication, home appliances, construction, automobile, plumbing and other fields. However, aluminum alloys are prone to damage in the form of pitting corrosion, crevice corrosion, stress corrosion and corrosion fatigue when used in humid, alkaline media such as industrial gases and fuel gases, and salt water. [0003] In order to prevent aluminum and its alloys from being corroded, people generally treat their ...

Claims

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Application Information

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IPC IPC(8): C23C22/07
CPCC23C22/07
Inventor 石明
Owner 无锡永发电镀有限公司
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