Aluminum alloy with micro-arc oxide ceramic membrane on surface and preparation method thereof

A micro-arc oxidation, aluminum alloy technology, applied in the direction of anodizing, surface reaction electrolytic coating, electrolytic coating, etc. The application of the loose layer on the membrane surface is hindered, so as to reduce the production cost and improve the production efficiency.

Active Publication Date: 2009-12-23
SHANGHAI MUNICIPAL ELECTRIC POWER CO +1
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  • Abstract
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  • Application Information

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Problems solved by technology

However, removing the loose layer increases the complexity of the micro-arc oxidation process on the one hand, and on the other hand easily destroys the microscopic surface structure of the dense layer, reducing the wear resistance of the film layer.
Therefore, the formation of a loose layer on the surface of aluminum alloy micro-arc oxidation ceramic film has seriously hindered the application of practical engineering.

Method used

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  • Aluminum alloy with micro-arc oxide ceramic membrane on surface and preparation method thereof

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preparation example Construction

[0018] The preparation method of the aluminum alloy 100 with the micro-arc oxidation ceramic film 12 on the surface of the preferred embodiment of the present invention comprises the following steps:

[0019] First, put the aluminum alloy substrate 10 into an alkaline decontamination solution for decontamination treatment for about 10 minutes, so as to remove oil stains and dirt on the substrate 10 . After decontamination, the substrate 10 is washed with water.

[0020] The decontaminated aluminum alloy substrate 10 is placed in a stainless steel oxidation tank containing an electrolyte. When a forward voltage is applied, the aluminum alloy substrate 10 is used as an anode, and the stainless steel oxidation tank is used as a cathode. The electrolyte solution can be one or more of phosphate solution, borate solution, silicate solution, aluminate solution or hydroxide solution. Described phosphate solution can be sodium hexametaphosphate ((NaPO 3 ) 6 , 5.0~25.0g / L), sodium tr...

Embodiment 1

[0026] Embodiment 1: choose 1060 type aluminum alloy matrix, with potassium hydroxide (KOH, 1.0g / L), sodium silicate (Na 2 SiO 3 , 2.0g / L) of the mixed solution is the electrolyte, using a constant current, with the substrate as the anode, and the stainless steel oxidation tank as the cathode for the initial oxidation of the substrate. The constant current density is 5A / dm 2 , the initial oxidation treatment time was 1 minute, and the treatment temperature was 20°C. After the initial oxidation is completed, positive and negative bidirectional pulse voltages are used to continue to oxidize the substrate, and the positive and negative voltages rise to a maximum value at a certain rate during switching and then remain constant. Among them, the maximum positive voltage is set to 500V, the maximum negative voltage is set to 60V, the positive and negative pulse widths are both 1000μs, and the pulse interval is 300μs. The total time of the continuous oxidation treatment is 60 minu...

Embodiment 2

[0027] Embodiment 2: choose 2017 type aluminum alloy matrix, with sodium hydroxide (NaOH, 2.0g / L), sodium fluoride (NaF, 20.0g / L), sodium metaaluminate (NaAlO 2 , 2.0g / L) mixed solution as the electrolyte, using a constant current, with the substrate as the anode and the stainless steel oxidation tank as the cathode to perform initial oxidation on the substrate. The constant current density is 6A / dm 2, the initial treatment time was 2 minutes, and the treatment temperature was 20 °C. After the initial oxidation is completed, the positive and negative bidirectional pulse voltages are used to continue the oxidation treatment of the substrate. The positive and negative voltages rise to a maximum value at a certain rate during switching and remain constant. The maximum positive voltage is set to 550V, and the maximum negative voltage is set to 550V. It is 90V, the positive and negative pulse width is 2000μs, and the pulse interval is 500μs. The total time of the continuous oxida...

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Abstract

The invention relates to an aluminum alloy which comprises an aluminum alloy matrix and a micro-arc oxide ceramic membrane formed on the surface of the matrix, wherein the ceramic membrane comprises a bottom transition layer, a middle compact layer and a surface compact layer. The preparation method of the aluminum alloy, which is used for forming the micro-arc oxide ceramic membrane without a loose layer on the surface of the aluminum alloy, comprises the following steps: putting the aluminum alloy matrix in an oxidation tank containing electrolyte; carrying out initial oxidation treatment for the aluminum alloy matrix by adopting constant current; and continuously applying oxidation treatment to the aluminum alloy matrix by adopting positive and negative bidirectional pulse voltage, wherein positive and negative voltage keeps constant after rising to the maximum value, wherein the maximum constant positive voltage is 450V-650V, the maximum constant negative voltage is 30V-200V, the width of positive and negative pulse is 1000-10000mus, the pulse interval is 300-2000mus, the continuous oxidation treatment time is 30-180min, and the treatment temperature is between 20 DEG C and 50DEG C.

Description

technical field [0001] The invention relates to an aluminum alloy with a micro-arc oxidation ceramic film on the surface and a preparation method thereof. Background technique [0002] Due to its low density, light weight, good machinability and high specific strength, aluminum alloys have been widely used in the fields of construction, automobiles, aviation and electronic products. However, due to the shortcomings of aluminum alloys such as low hardness and poor corrosion resistance, it is generally necessary to carry out surface treatment on the aluminum alloy before use to form an oxide film layer with high hardness and strong corrosion resistance on the surface. [0003] Micro-arc oxidation technology (also known as plasma oxidation, anodic spark deposition, spark discharge anodic deposition and surface ceramization, etc.) is a technology that directly grows an oxide film in situ on the metal surface. The traditional ceramic film formed on the surface of aluminum alloy ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/04
CPCC25D11/04C25D11/026C25D11/024C25D11/20Y10T428/12458
Inventor 戴丰源罗勇达韩婧张保申刘伟乔勇严琦琦何纪壮
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO
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