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Micro arc oxidation treating process for aluminium alloy cylinder inner surface

A technology of micro-arc oxidation and treatment process, which is applied in anodic oxidation and other directions to achieve the effect of improving wear resistance and improving utilization rate

Inactive Publication Date: 2006-02-22
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Especially the surface micro-arc oxidation hardening treatment of aluminum alloy, due to the high hardness of the alumina ceramic layer and the oil storage characteristics of a large number of blind micropores evenly distributed on the surface, it is only suitable for use under the condition of reducing friction

Method used

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  • Micro arc oxidation treating process for aluminium alloy cylinder inner surface

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Embodiment 1

[0020] Embodiment one of the present invention: alkaline electrolytic solution is hexametaphosphate series electrolytic solution, by weight and total volume ratio, get sodium hexametaphosphate 15g / L, sodium silicate 8g / L, sodium molybdate 13g / L, Sodium carbonate 7g / L, sodium tungstate 3g / L prepare alkaline electrolytic solution. Adjust the pH range of the prepared alkaline electrolytic solution between 8-12, the alkaline electrolytic solution enters the cylinder body 1 through the built-in stainless steel pipe 4, and the alkaline electrolytic solution flows from the solution guide pipe 3 at the other end of the cylinder body 1 flow out. The alkaline electrolytic solution circulates in the cylinder body 1 through the solution circulation cooling system 6; then the built-in stainless steel tube 4 is connected to the negative pole of the power supply 5, and the outer wall of the cylinder is connected to the positive pole of the power supply 5; the cylinder body is applied with a ...

Embodiment 3

[0022] Embodiment three of the present invention: alkaline electrolytic solution is hexametaphosphate series electrolytic solution, by weight and total volume ratio, get sodium hexametaphosphate 19g / L, sodium silicate 9g / L, sodium molybdate 14g / L preparation , sodium carbonate 8g / L, sodium tungstate 5g / L to prepare alkaline electrolytic solution. Adjust the pH value range of the prepared alkaline electrolytic solution between 8-12, enter the cylinder body 1 through the built-in stainless steel pipe 4, and the alkaline electrolytic solution flows out from the solution guide pipe 3 at the other end of the cylinder body 1, and the alkali The electrolytic solution circulates in the cylinder body 1 through the solution circulation cooling system 6; the built-in stainless steel tube 4 is connected to the negative pole of the power supply 5, and the outer wall of the cylinder is connected to the positive pole of the power supply 5; a voltage is applied to the cylinder body through the...

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Abstract

During the micro arc oxidizing treatment of aluminum alloy cylinder inner surface, alkali electrolyte solution is made to flow through the cylinder and circulate via the solution circulating and cooling system; and power supply is applied across the stainless steel tube connected to the negative pole and the outer cylinder wall connected to the positive pole; so as to form one compact Al2O3 ceramic layer on the inner surface of the cylinder. 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. In addition, the inner surface ceramic layer with heat insulating property results in raised combustor heat utilization while the outer surface of the cylinder maintains its heat dissipating performance.

Description

technical field [0001] The invention belongs to the surface hardening treatment technology of an aluminum alloy cylinder body, in particular to a micro-arc oxidation treatment process for the inner surface of an aluminum alloy cylinder body. 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] The hardening treatment process of aluminum alloy surface has been greatly developed in recent years, such as hard anodic oxidation, thermal spraying, etc., which have been widely used in the industry. The micro-arc oxidation process is a developed in recent years. The surface treatment process of non-ferrous metals (such...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/06
Inventor 郝建民王利捷陈宏张荣军
Owner CHANGAN UNIV