Preparing method of Al-Cu-Mg series aluminum alloy surface composite ceramic membrane layer based on potassium tetraborate

A composite ceramic film and aluminum alloy surface technology, applied in the direction of anodic oxidation, etc., can solve the problems of complex preparation process of composite ceramic film layer, poor substrate bonding force, high energy consumption, etc., shorten processing time, improve mechanical properties, and improve manufacturing process high effect

Inactive Publication Date: 2018-09-04
DALIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention aims to improve the flexural strength and fracture toughness of the micro-arc oxidation ceramic film layer on the surface of Al-Cu-Mg series aluminum alloy, and simultaneously solve the problem of existing Al 2 o 3 -AlB 12 The preparation process of the composite ceramic film is complex, time-consuming, high energy consumption, and poor bonding with the substrate. To provide an Al-Cu-Mg aluminum alloy based on potassium tetraborate, especially 2024 aluminum alloy surface Al 2 o 3 -AlB 12 Preparation method of composite ceramic film layer

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A 2024 aluminum alloy surface Al based on potassium tetraborate 2 o 3 -AlB 12 The preparation method of composite ceramic film layer is carried out according to the following steps:

[0019] The 2024 aluminum alloy workpiece is used as the anode, and the stainless steel plate of the electrolytic cell is used as the cathode. The anode is immersed in the working solution, and then a bipolar pulse power supply is applied between the cathode and the anode, and the initial value of the forward voltage is 50V. The final value of forward voltage is 560V, the initial value of reverse voltage is 20V, the final value of reverse voltage is 82V, and the current density is 10A / dm 2 , the frequency is 2000 Hz, and the temperature of the working fluid is 30 ℃ ~ 65 ℃, the treatment time is 30 minutes, and the surface Al of 2024 aluminum alloy is obtained. 2 o 3 -AlB 12 Composite ceramic film layer.

[0020] The size of the 2024 aluminum alloy workpiece is 50mm×100mm×1mm.

[0021...

Embodiment 2

[0025] A 2024 aluminum alloy surface Al based on potassium tetraborate 2 o 3 -AlB 12 The preparation method of composite ceramic film layer is carried out according to the following steps:

[0026] The 2024 aluminum alloy workpiece is used as the anode, and the stainless steel plate of the electrolytic cell is used as the cathode. The anode is immersed in the working solution, and then a bipolar pulse power supply is applied between the cathode and the anode, and the initial value of the forward voltage is 50V. The final value of forward voltage is 620V, the initial value of reverse voltage is 20V, the final value of reverse voltage is 91V, and the current density is 13.5A / dm 2 , the frequency is 1250Hz, and the working fluid temperature is 20°C-65°C, and the processing time is 40min, the surface Al of 2024 aluminum alloy is obtained. 2 o 3 -AlB 12 Composite ceramic film layer.

[0027] The size of the 2024 aluminum alloy workpiece is 40mm×75mm×1mm.

[0028] The working...

Embodiment 3

[0032] A 2024 aluminum alloy surface Al based on potassium tetraborate 2 o 3 -AlB 12 The preparation method of composite ceramic film layer is carried out according to the following steps:

[0033] The 2024 aluminum alloy workpiece is used as the anode, and the stainless steel plate of the electrolytic cell is used as the cathode. The anode is immersed in the working solution, and then a bipolar pulse power supply is applied between the cathode and the anode, and the initial value of the forward voltage is 50V. The final value of forward voltage is 650V, the initial value of reverse voltage is 20V, the final value of reverse voltage is 93V, and the current density is 15A / dm 2 , the frequency is 800Hz, and the working fluid temperature is 35°C-80°C, the processing time is 48min, and the surface Al of 2024 aluminum alloy is obtained. 2 o 3 -AlB 12 Composite ceramic film layer.

[0034] The size of the 2024 aluminum alloy workpiece is 40mm×60mm×1mm.

[0035] The working li...

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Abstract

The invention provides a preparing method of an Al-Cu-Mg series aluminum alloy surface composite ceramic membrane layer based on potassium tetraborate. The Al-Cu-Mg series 2024 aluminum alloy workpiece serves as an anode, a stainless steel plate of an electrolytic bath serves as a cathode, the workpiece anode is immersed in work liquid, bipolar pulse electricity is applied to the position betweenthe cathode and the anode, micro-arc oxidation treatment is carried out, potassium tetraborate in the work liquid and aluminum in a 2024 aluminum alloy matrix are subject to a plasma chemical reaction, and the Al2O3-AlB12 composite ceramic membrane layer on the surface of the Al-Cu-Mg series aluminum alloy can be obtained. The problems that an existing Al2O3-AlB12 composite ceramic membrane layeris complex in preparing process, long in time and high in energy consumption are solved, and the anti-bending strength and the fracture toughness of the Al-Cu-Mg series aluminum alloy surface micro-arc oxidation ceramic membrane layer can be improved.

Description

technical field [0001] The invention relates to the field of metal surface modification, in particular to a ceramic film layer on the surface of an aluminum alloy and a preparation method thereof. Background technique [0002] 2024 aluminum alloy is a high-strength hard aluminum alloy belonging to the Al-Cu-Mg series. Because of its high specific stiffness and good machinability, it is mainly used to manufacture various high-load parts and components, such as aircraft Skeleton parts, skins, bulkheads, ribs, spars, rivets, etc. However, its corrosion resistance and wear resistance are low, and its corrosion resistance, wear resistance and fracture resistance must be enhanced by surface modification technology in its practical application. [0003] Micro-arc oxidation technology is often used to improve the properties of aluminum alloy surfaces. The main component of the micro-arc oxidation ceramic film on the surface of aluminum alloy is Al 2 o 3 , has excellent propertie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/06C22C21/18C22C21/16
CPCC25D11/026C22C21/16C22C21/18C25D11/024C25D11/06
Inventor 吕鹏翔王元刚
Owner DALIAN UNIV
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