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A Room Temperature Joining Method of Alloys Based on Micro-arc Oxidation

A technology of micro-arc oxidation and connection method, applied in the direction of anodizing, coating, surface reaction electrolytic coating, etc., can solve the problems of softening of base metal and low strength of low-temperature brazing joints, so as to achieve high bonding strength and high connection efficiency , to solve the effect of low intensity

Inactive Publication Date: 2020-11-10
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention can connect various aluminum alloys at room temperature, not only can solve the problem of softening of base metal caused by welding heat cycle, but also solve the problem of low strength of low temperature brazed joints

Method used

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  • A Room Temperature Joining Method of Alloys Based on Micro-arc Oxidation
  • A Room Temperature Joining Method of Alloys Based on Micro-arc Oxidation
  • A Room Temperature Joining Method of Alloys Based on Micro-arc Oxidation

Examples

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Embodiment 1

[0031] Example 1: In this embodiment, the same metal 6061 aluminum alloy is connected by micro-arc oxidation, the electrolyte used is NaOH solution, and the main film-forming agent used is Na 2 SiO 3 .

[0032] In this embodiment, the use of micro-arc oxidation to connect 6061 aluminum alloys is carried out according to the following steps:

[0033] Step 1. Clean the surface of the 6061 aluminum alloy to be connected, remove the oil and impurities on the surface, polish the surface, and set the gap between the two metals to 100 μm. The schematic diagram of the assembly and device of the test piece is as follows figure 1 shown.

[0034] Step 2, configure the electrolyte according to the required requirements, the solute of the electrolyte is 5g / L NaOH, 12g / L Na 2 SiO 3 , the solvent is water, where Na 2 SiO 3 as the main film former.

[0035] Step 3. When assembling the joint, two pieces of aluminum alloy are connected to the positive electrode, and the carbon rod is con...

Embodiment 2

[0036] Example 2: In this embodiment, different aluminum alloys (6061 aluminum alloy and 5083 aluminum alloy) are connected by micro-arc oxidation, the electrolyte used is KOH solution, and the main film-forming agent used is NaAlO 2 .

[0037]In this embodiment, the connection of 6061 aluminum alloy and 5083 aluminum alloy using micro-arc oxidation is carried out according to the following steps:

[0038] Step 1. Clean the surfaces of 6061 aluminum alloy and 5083 aluminum alloy to be connected, remove oil and impurities on the surface, polish the surface, and set the gap between the two metals to 50 μm. The assembly diagram of the test piece is as follows figure 1 shown.

[0039] Step 2. Configure the electrolyte according to the required requirements. The solute of the electrolyte is 4g / L of KOH and 12g / L of NaAlO 2 , the solvent is water. where NaAlO 2 as the main film-forming agent.

[0040] Step 3. When assembling the joint, the aluminum alloy is connected to the pos...

Embodiment 3

[0041] Example 3: In this embodiment, the same magnesium alloy AZ91 (its chemical composition is: 8.56% Al, 0.82% Mn, 0.41% Zn, and the balance is Mg) is connected by micro-arc oxidation. The electrolyte is NaOH solution, and the main film-forming agent used is Na 2 SiO 3 .

[0042] In this embodiment, the use of micro-arc oxidation to connect the same kind of magnesium alloy AZ91 is carried out according to the following steps:

[0043] Step 1. Clean the surface of the magnesium alloy to be connected, remove the oil and impurities on the surface, polish the surface, and set the gap between the two metals to 80 μm. The assembly diagram of the test piece is as follows figure 1 shown.

[0044] Step 2, configure the electrolyte according to the required requirements, the solute of the electrolyte is 5g / L NaOH, 12g / L Na 2 SiO 3 , the solvent is water, in fact Na 2 SiO 3 as the main film former.

[0045] Step 3. When assembling the joint, the magnesium alloy is connected to...

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Abstract

The invention provides an alloy room temperature connection method based on micro-arc oxidation. The alloy room temperature connection method comprises the following steps of polishing to-be-welded surfaces of two alloys, and assembling to form a to-be-welded connector, wherein the gap between the two to-be-welded surfaces is 30-100 [mu]m; then immersing the assembled connector in electrolyte, connecting the two alloys with a cathode, and connecting a carbon rod with an anode, wherein the interval between the cathode and the anode is 10-50 mm; and performing micro-arc oxidation to enable oxidefilms to begin to grow to the centers of the two to-be-welded surfaces separately until the oxide films on two sides grow to meet to form a connector. Various aluminum alloys can be connected at roomtemperature, so that the problem that a parent material is softened due to welding thermal cycle can be solved, and the defect of low strength of low-temperature brazed joints is overcome.

Description

technical field [0001] The invention belongs to the field of welding technology, and in particular relates to a method for connecting aluminum alloys at room temperature based on micro-arc oxidation. Background technique [0002] Aluminum alloy has low density, high specific strength, and good electrical and thermal conductivity. The mechanical properties of the alloy can be significantly improved by adding alloying elements and heat treatment. The use of Al instead of steel on structural parts can reduce weight and energy consumption, and the use of Al instead of Cu in the electrical and electronic fields can significantly reduce costs. Therefore, aluminum and its alloys are now widely used in the fields of automobiles, aerospace, precision instruments and electronic devices. [0003] In these areas where aluminum alloys are used, it is necessary to connect aluminum alloys. However, for deformation-strengthened and heat-treated aluminum alloys, the welding heat process wi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P15/00C25D11/06C25D11/30C25D11/26
CPCB23P15/00C25D11/026C25D11/06C25D11/26C25D11/30
Inventor 郭卫兵魏鑫薛海涛袁野
Owner HEBEI UNIV OF TECH
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