Electrolytic solution for aluminium alloy cast piece micro arc oxidation treatment

A technology of aluminum alloy castings and electrolytic solution, applied in the direction of anodic oxidation, etc., can solve the problems of costly and time-consuming process, complex process, low processing cost, etc., and achieve the effect of less processing steps, simple process and high reaction temperature

Inactive Publication Date: 2004-12-15
XIAN UNIV OF TECH
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Problems solved by technology

[0006] Although the manufacturing processes of the above-mentioned engine blocks solve the problem of reducing the weight of the engine and do not cause pollution to the environment, these processes have not been applied in mass-produced vehicles due to th

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  • Electrolytic solution for aluminium alloy cast piece micro arc oxidation treatment
  • Electrolytic solution for aluminium alloy cast piece micro arc oxidation treatment

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Embodiment 1

[0026] Embodiment one of the present invention: electrolytic solution is phosphoric acid series electrolytic solution, by weight and total volume ratio, get sodium phosphate 15g / L, sodium silicate 8g / L, potassium hydroxide 3g / L, sodium molybdate 13g / L, Sodium carbonate 7g / L, sodium tungstate 3g / L prepare alkaline electrolytic solution. The pH range of the prepared electrolytic solution is adjusted between 8-12, and the aluminum alloy cylinder 1 or the aluminum alloy piston 5 is placed in the electrolytic solution. Then connect the stainless steel tube 2 to the negative pole of the power supply 3, and connect the outer wall of the aluminum alloy cylinder 1 or the aluminum alloy piston 5 to the positive pole of the power supply 3; apply a voltage to the aluminum alloy cylinder 1 or the aluminum alloy piston 5 through the power supply 3, pressurize 600V, After 45 minutes, a dense Al layer will grow in situ on the surface of the aluminum alloy casting. 2 o 3 ceramic layer.

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Abstract

The electrolyte solution is used in micro arc oxidizing treatment of aluminum alloy casting in some micro arc apparatus. By means of setting the cylinder inside electrolyte solution compounded with sodium phosphate, sodium silicate, potassium hydroxide and sodium molybdate and applying voltage to the cylinder, one alumina ceramic layer with alumina as main component may be formed on the surface of the aluminum alloy cylinder. The formed alumina ceramic layer has aluminum atom originating from the aluminum alloy and oxygen ion from the electrolyte solution, and the process produces no pollution and has high combination strength between the ceramic layer and the base. The ceramic layer has blind micropores distributed homogeneously, and under friction reducing condition, one continuous oil film is formed on the surface to raise the wear resistance of the surface of the cylinder.

Description

technical field [0001] The invention belongs to the hardening treatment technology of aluminum alloy castings, and particularly relates to an electrolytic solution suitable for micro-arc oxidation treatment of aluminum alloy cylinder bodies or aluminum alloy pistons. technical background [0002] Aluminum alloy has become one of the main consumables of gasoline (diesel) engines due to its light weight and easy forming characteristics, but its wear resistance and scratch resistance are poor, which limits its direct use as a friction pair on the engine block. application, a suitable inner surface hardening treatment or inlay wear-resistant cylinder liner must be carried out. [0003] Since the late 1960s to the present, hypereutectic aluminum-silicon alloys have been used to manufacture automotive engine blocks without gray cast iron cylinder liners in some vehicles from GM, Mereedes, Audi and Porsche. Strictly specified honing and erosion processes are used to make the granu...

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Application Information

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IPC IPC(8): C25D11/06
Inventor 李均明蒋百灵孙俊图白力静时惠英
Owner XIAN UNIV OF TECH
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