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Surface treatment method capable of improving aluminium alloy corrosion resistance

A surface treatment and corrosion-resistant technology, used in metal material coating technology, metal processing equipment, surface reaction electrolytic coating, etc., to achieve low cost, ensure durability, and easy operation.

Inactive Publication Date: 2018-12-04
JIANGSU HEXING AUTOMOTIVE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although there have been many researches and applications on the anodic oxidation process, the long-term corrosion resistance of aluminum alloys is still a difficult problem faced by many experts and scholars.

Method used

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  • Surface treatment method capable of improving aluminium alloy corrosion resistance
  • Surface treatment method capable of improving aluminium alloy corrosion resistance

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Pretreatment: Degreasing and degreasing, ultrasonic cleaning, electrochemical polishing, and soft abrasive flow polishing are performed on aluminum alloy workpieces in sequence. Wherein, the electrochemical polishing solution comprises the following components in mass percentage: 30% sulfuric acid, 60% phosphoric acid, 3% deionized water, 3% ethanol, 1.8% urea, 0.2% benzotriazole, 1.5% glycerin; The voltage value of polishing is required to be 28V, and the time is 1100s; the abrasive particles in the process of soft abrasive flow polishing are nano-zirconia, and the abrasive particle size is 0.1nm;

[0027]Platinization treatment: Platinization solution for platinum treatment is: tetrafluoroplatinic acid 50g / L, polyethylene glycol 25g / L, carboxyethyl cellulose 25g / L, polyacrylate 20g / L; The time is 3min, the temperature is 60°C;

[0028] Anodizing treatment: The electrolyte for anodizing treatment is: sodium silicate 5g / L, oxidized dilute sulfuric acid 15g / L, sodium tu...

Embodiment 2

[0036] Pretreatment: Degreasing and degreasing, ultrasonic cleaning, electrochemical polishing, and soft abrasive flow polishing are performed on aluminum alloy workpieces in sequence. Wherein, the electrochemical polishing solution comprises the following components in mass percentage: 31% sulfuric acid, 61% phosphoric acid, 3.5% deionized water, 3.5% ethanol, 1.85% urea, 0.4% benzotriazole, 1.6% glycerin; The voltage value of polishing is required to be 30V, and the time is 1300s; the abrasive particles in the process of soft abrasive flow polishing are nano-zirconia, and the abrasive particle size is 0.2nm;

[0037] Platinization treatment: Platinization solution for platinum treatment is: tetrafluoroplatinic acid 55g / L, polyethylene glycol 26g / L, carboxyethyl cellulose 30g / L, polyacrylate 22g / L; The time is 3.5min and the temperature is 62°C;

[0038] Anodizing treatment: The electrolyte for anodizing treatment is: sodium silicate 6g / L, oxidized dilute sulfuric acid 16g / L...

Embodiment 3

[0046] Pretreatment: Degreasing and degreasing, ultrasonic cleaning, electrochemical polishing, and soft abrasive flow polishing are performed on aluminum alloy workpieces in sequence. Wherein, the electrochemical polishing solution comprises the following components in mass percentage: 33% sulfuric acid, 63% phosphoric acid, 4% deionized water, 4% ethanol, 1.9% urea, 0.6% benzotriazole, 1.8% glycerin; The voltage value of polishing is required to be 33V, and the time is 1450s; the abrasive particles in the process of soft abrasive flow polishing are nano-zirconia, and the particle size of abrasive particles is 0.3nm;

[0047] Platinization treatment: Platinization solution for platinum treatment is: tetrafluoroplatinic acid 60g / L, polyethylene glycol 28g / L, carboxyethyl cellulose 32g / L, polyacrylate 25g / L; The time is 4min, the temperature is 65°C;

[0048] Anodizing treatment: The electrolyte for anodizing treatment is: sodium silicate 8g / L, oxidized dilute sulfuric acid 18...

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Abstract

The invention relates to an aluminium alloy surface treatment technology, and more specifically relates to a surface treatment method capable of improving aluminium alloy corrosion resistance, and belongs to the technical field of aluminium alloy surface treatment. The surface treatment method comprises following steps: pretreatment, platinization treatment, anodic oxidation treatment, hot water washing, cold hole sealing treatment, electrophoresis treatment, heat baking, and laser polishing treatment. A platinization solution adopted in the surface treatment method comprises 50 to 70g / L of tetrafluoroplatinic acid, 25 to 30g / L of polyethylene glycol, 25 to 40g / L of carboxyethyl cellulose, and 20 to 30g / L of polyacrylate. The surface treatment method is simple, is convenient in operation,low in cost, excellent in effect, and promising in application prospect, and is convenient for popularization and industrialization.

Description

field of invention [0001] The invention relates to an aluminum alloy surface treatment process, in particular to a surface treatment process for improving the corrosion resistance of aluminum alloy, and belongs to the technical field of aluminum alloy surface treatment. Background technique [0002] Aluminum and its aluminum alloys have the advantages of high specific strength, good electrical and thermal conductivity, strong reflective properties, beautiful color, non-magnetic, strong corrosion resistance, strong plasticity, and no low-temperature brittleness. They are good industrial materials. [0003] With its irreplaceable excellent metal properties, aluminum and aluminum alloys have become the second largest metal material in the world after steel. With the wide application of aluminum alloy materials, its corresponding surface treatment technology has also developed rapidly. Surface treatment of aluminum profiles can effectively improve and enhance the corrosion resi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/34C25F3/20C25D11/08C25D11/24B23K26/00B23K26/352B24C1/08B24C11/00
CPCB23K26/00B23K26/352B24C1/08B24C11/00C23C22/34C25D11/08C25D11/246C25F3/20
Inventor 高国福王超李杰李娟
Owner JIANGSU HEXING AUTOMOTIVE TECH
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