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A kind of preparation technology of high temperature resistant anodic oxidation layer of aluminum alloy

A technology of anodic oxidation layer and preparation process, which is applied in the direction of anodic oxidation, coating, surface reaction electrolytic coating, etc., can solve problems that cannot be solved well, achieve reasonable distribution, improve high temperature resistance, micropores even size effect

Active Publication Date: 2020-06-05
JIANGSU HEXING AUTOMOTIVE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At most, it is by changing the structure of the film layer or increasing the number of film layers, but these methods cannot solve the problem well

Method used

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  • A kind of preparation technology of high temperature resistant anodic oxidation layer of aluminum alloy
  • A kind of preparation technology of high temperature resistant anodic oxidation layer of aluminum alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Pre-treatment: Hang the aluminum alloy workpiece on the titanium hanger with firm suspension and good conductivity. Pour the degreasing solution into the degreasing tank, including the following components by mass: sodium phosphate 13%, ethylene glycol monomethyl ether 6% , 0.7% defoamer, 36% water, and the balance is composite surfactant, then put the workpiece into the degreasing tank for degreasing, set the temperature in the degreasing tank to 60°C, and the degreasing time to 5min, and assist with the frequency of 30KHz. Ultrasonic degreasing, and then the workpiece after degreasing is used as the anode for electrochemical polishing in the polishing solution, wherein the polishing solution includes sulfuric acid 400g / L, oxalic acid 150g / L, phosphoric acid 900g / L, nitric acid 230g / L, and the conductivity during polishing The rate is 53ms / cm, the power-on mode is DC voltage regulation, the power-on voltage is 37V, and the polishing time is 1650s.

[0031] Film product...

Embodiment 2

[0034]Pre-treatment: Hang the aluminum alloy workpiece on the titanium hanger with firm suspension and good conductivity. Pour the degreasing solution into the degreasing tank, including the following components by mass: 10% sodium phosphate, 5% ethylene glycol monomethyl ether , 0.6% defoaming agent, 35% water, and the balance is composite surfactant, then put the workpiece into the degreasing tank for degreasing, set the temperature in the degreasing tank to 50 °C, and the degreasing time to 3 minutes, and assist with a frequency of 25KHz Ultrasonic degreasing, and then electrochemical polishing was carried out with the degreasing workpiece as the anode in the polishing solution. The polishing solution included sulfuric acid 300g / L, oxalic acid 100g / L, phosphoric acid 800g / L, nitric acid 200g / L, and the conductivity during polishing The rate is 50ms / cm, the power-on mode is DC voltage regulation, the power-on voltage is 35V, and the polishing time is 1500s.

[0035] Film pro...

Embodiment 3

[0038] Pre-treatment: Hang the aluminum alloy workpiece on the titanium hanger with firm suspension and good electrical conductivity. Pour the degreasing solution into the degreasing tank, including the following components in mass percentage: sodium phosphate 16%, ethylene glycol monomethyl ether 7% , 0.8% defoaming agent, 37% water, and the balance is composite surfactant, then put the workpiece into the degreasing tank for degreasing, set the temperature in the degreasing tank to 70 ℃, the degreasing time to 6 minutes, and the frequency of 35KHz to assist Ultrasonic degreasing, and then the workpiece after degreasing is used as the anode for electrochemical polishing in the polishing solution. The polishing solution includes sulfuric acid 500g / L, oxalic acid 200g / L, phosphoric acid 1000g / L, nitric acid 260g / L, and the conductivity during polishing The rate is 55ms / cm, the power-on mode is DC voltage regulation, the power-on voltage is 40V, and the polishing time is 1800s.

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Abstract

The invention discloses a preparation process of an aluminum alloy high-temperature-resistant anodic oxide layer and belongs to the technical field of metal surface treatment. A good protecting systemis formed on the surface of the aluminum alloy through steps of pre-treatment, film making, post-treatment and the like. A deionized hot water soaking process is added after film making, a pre-hole sealing film is formed between a cold sealing layer and an oxidizing film, and a cracking phenomenon caused by the fact that the coefficients of thermal expansion of nickel salt of the cold sealing layer and the oxidizing layer at a high temperature are different is alleviated. The high-temperature-resistant performance of the anodic oxide layer can be enhanced by means of the hot water soaking process, and the highest high-temperature resistance of the oxidizing layer is increased from 80 DEG C to 110 DEG C, so that the demand on protecting automobile exterior trimming parts at a high temperature is met. Moreover, the whole process can fully eliminate cracks of the oxide layer brought by the conventional process so as to obtain a smooth and level protecting layer.

Description

technical field [0001] The invention belongs to the technical field of metal surface treatment, and in particular relates to a preparation process of an aluminum alloy high temperature resistant anodic oxide layer. Background technique [0002] The upward extension of science and technology is bound to lead the favorable development of society, which is embodied in the people's clothing, food, housing and transportation. The continuous innovation of transportation has greatly shortened the distance between them. As the current main means of transportation, the material composition and surface treatment process of automobiles greatly affect the service life. [0003] The structural materials and exterior parts of automobiles are generally alloy steel or aluminum alloys, and with the development of lightweight automobiles, the increasing use of aluminum alloys has become an inevitable trend. Aluminum alloy has the advantages of high specific strength, good thermal and electr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/24C25D11/16C25D11/08C25D11/10C23G1/24C25F3/20
CPCC23G1/24C25D11/08C25D11/10C25D11/16C25D11/246C25F3/20
Inventor 李杰王超高国福唐欢
Owner JIANGSU HEXING AUTOMOTIVE TECH