A kind of composite nano-electrolyte for preparing micro-arc oxidation film on aluminum alloy surface and its application

An aluminum alloy surface, composite electrolyte technology, applied in the direction of surface reaction electrolytic coating, anodic oxidation, electrolytic coating, etc., can solve the problems of reducing residual stress of oxide film, easy to produce defects and cracks, affecting practical application, etc. Wide sintering temperature range, reduction of cracks and defects, good effect of grain boundary bonding

Inactive Publication Date: 2018-07-20
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the microstructure of the oxide film is prone to defects and cracks, which greatly reduces the residual stress in the oxide film, thus affecting its practical application.

Method used

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  • A kind of composite nano-electrolyte for preparing micro-arc oxidation film on aluminum alloy surface and its application
  • A kind of composite nano-electrolyte for preparing micro-arc oxidation film on aluminum alloy surface and its application
  • A kind of composite nano-electrolyte for preparing micro-arc oxidation film on aluminum alloy surface and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Specimen material: LY12, size 100×100mm, the surface of the aluminum alloy workpiece is placed in the electrolyte as the anode, and the stainless steel as the cathode. First place the aluminum alloy workpiece in the initial treatment electrolyte containing sodium hydroxide concentration of 4.5g / L, sodium silicate concentration of 3.7g / L and solvent as water, and the current density is controlled at 4.5A / dm 2 Take it out after oxidizing for 10 minutes. After washing with water, put the aluminum alloy workpiece into the secondary treatment nano-composite electrolyte. The electrolyte composition is: the concentration of sodium hydroxide is 4.6g / L, the concentration of sodium silicate is 3.5g / L, and the concentration of sodium molybdate is 0.2 g / L, the concentration of sodium malate is 0.75 / L, the concentration of nano-magnesia is 0.8g / L, the concentration of nano-yttrium oxide is 0.5g / L, and water is the balance. Then apply a high-frequency composite carrier to the electr...

Embodiment 2

[0030] Specimen material: 5083, size 100×100mm, the surface of the aluminum alloy workpiece is placed in the electrolyte as the anode, and the stainless steel as the cathode. First place the aluminum alloy workpiece in the initial treatment electrolyte containing sodium hydroxide concentration of 4.7g / L, sodium silicate concentration of 3.8g / L and solvent as water, and the current density is controlled at 3.6A / dm 2 Take it out after oxidizing for 10 minutes. After washing with water, put the aluminum alloy workpiece into the nanocomposite electrolyte for secondary treatment. The concentration of triazole is 0.96g / L, the concentration of sodium malate is 0.78g / L, the concentration of nano-magnesia is 1.2g / L, the concentration of nano-yttrium oxide is 0.6g / L, and water is the balance. Then apply a high-frequency composite carrier to the electrolytic circuit to oxidize the surface of the workpiece, and the current density is controlled at 9A / dm 2 Between, pulse wave voltage fre...

Embodiment 3

[0032] Specimen material: LC4, size 100×100mm, the surface of the aluminum alloy workpiece is placed in the electrolyte as the anode, and the stainless steel as the cathode. First place the aluminum alloy workpiece in the initial treatment electrolyte containing sodium hydroxide concentration of 5g / L, sodium silicate concentration of 4g / L and solvent as water, and the current density is controlled at 4.2A / dm 2 Take it out after oxidizing for 10 minutes. After washing with water, put the aluminum alloy workpiece into the secondary treatment nano-composite electrolyte, the electrolyte composition is: the concentration of sodium hydroxide is 5g / L, the concentration of sodium silicate is 4g / L, and the concentration of sodium phosphate is 7g / L. The concentration of sodium molybdate is 0.25g / L, the concentration of benzotriazole is 1g / L, the concentration of nano-magnesium oxide is 0.6g / L, the concentration of nano-yttrium oxide is 0.7g / L, and water is the balance. Then apply a hig...

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Abstract

The invention discloses a compound nanometer electrolyte solution used for preparing micro-arc oxidation films on the surface of aluminum alloy and application thereof and belongs to the technical field of the aluminum alloy surface treatment. The compound nanometer electrolyte solution is composed of an initially-treated electrolyte solution and a secondarily-treated compound electrolyte solution; the initially-treated electrolyte solution is formed by means of the method that sodium hydroxide and sodium silicate are dissolved in water; the secondarily-treated compound electrolyte solution is composed of a basic electrolyte solution, an auxiliary additive and a compound nanometer additive. According to the compound nanometer electrolyte solution used for preparing the micro-arc oxidation films on the surface of the aluminum alloy and the application thereof, the compound nanometer additive is added into the electrolyte solution, and the high-frequency compound carrier-wave control technology is combined, so that growing up of micro-arc aluminum oxide microstructure grains is inhibited, the transferring temperature of micro-arc oxidation film phases is lowered; and therefore, residual stress in oxidation ceramic films is reduced, the microstructure defects are reduced, the densification degree is improved, and comprehensive properties such as super-high corrosion resistance, super hardness and good surface perfection are achieved.

Description

technical field [0001] The invention relates to the technical field of aluminum alloy surface treatment, in particular to a composite nano-electrolyte for preparing a micro-arc oxidation film on the surface of an aluminum alloy and its application. Background technique [0002] Micro-arc oxidation technology, also known as micro-plasma oxidation, anodic spark deposition or spark discharge anodic oxidation, is a new surface treatment technology developed on the basis of ordinary anodic oxidation. The aluminum alloy is discharged in the electrolyte by high voltage, and its surface forms a layer of ceramic layer mainly composed of alumina that is metallurgically combined with the substrate. The high hardness, high impedance and high stability of the ceramic meet the requirements of the aluminum alloy for seawater corrosion resistance, Performance requirements such as high temperature hot corrosion and improved wear resistance. The oxide film has excellent bonding force and hig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/06
CPCC25D11/024C25D11/026C25D11/06
Inventor 杜克勤郭兴华郭泉忠王勇
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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