A kind of hard anodic oxidation treatment method of cast aluminum alloy workpiece

A technology of hard anodic oxidation and cast aluminum alloy, applied in the direction of electrolytic coating, surface reaction electrolytic coating, coating, etc., can solve problems such as unsuitable cast aluminum alloy, poor product quality, air bubble inclusion, etc., to improve quality, Shortened hard anodizing time and high yield

Active Publication Date: 2016-05-18
ZHEJIANG SUPOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although it has undergone T6 treatment before hard anodizing treatment, it is also heat treatment for deformed aluminum alloy, but since the cast aluminum alloy always has air bubbles in the workpiece during casting, if T6 heat treatment is used, the air bubbles inside the workpiece will expand , will cause poor product quality in large quantities, therefore, T6 heat treatment is not suitable for cast aluminum alloy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A method for hard anodizing a cast aluminum alloy workpiece, the method comprising:

[0039] Forming: After melting the aluminum-silicon cast aluminum alloy, pour it into a die-casting machine for die-casting to obtain the corresponding cast aluminum alloy workpiece, which is preferably a pot; as a preference, machine the obtained cast aluminum alloy workpiece , the machining includes removing the leftover material and burrs of the workpiece, and performing sandblasting to remove the oxide skin on the surface of the workpiece;

[0040] Heat treatment: heat-treat the above-mentioned cast aluminum alloy workpiece at 410°C-420°C, and keep it warm for 1.5 hours;

[0041] Hard anodic oxidation treatment: after the heat treatment, the cast aluminum alloy workpiece after heat treatment is subjected to hard anodic oxidation treatment, so that a hard anodic oxidation film is formed on the surface of the cast aluminum alloy workpiece; the conditions of the hard anodic oxidation t...

Embodiment 2

[0049] A method for hard anodizing a cast aluminum alloy workpiece, the method comprising:

[0050] Forming: After melting the aluminum-silicon cast aluminum alloy, pour it into a die-casting machine for die-casting to obtain the corresponding cast aluminum alloy workpiece, which is preferably a pot; as a preference, machine the obtained cast aluminum alloy workpiece , the machining includes removing the leftover material and burrs of the workpiece, and performing sandblasting to remove the oxide skin on the surface of the workpiece;

[0051] Heat treatment: Heat treatment of the above-mentioned cast aluminum alloy workpiece under the condition of 350℃~360℃, heat preservation treatment for 5 hours;

[0052] Hard anodic oxidation treatment: after the heat treatment, the cast aluminum alloy workpiece after heat treatment is subjected to hard anodic oxidation treatment, so that a hard anodic oxidation film is formed on the surface of the cast aluminum alloy workpiece; the conditi...

Embodiment 3

[0060] A method for hard anodizing a cast aluminum alloy workpiece, the method comprising:

[0061] Forming: After melting the aluminum-silicon cast aluminum alloy, pour it into a die-casting machine for die-casting to obtain the corresponding cast aluminum alloy workpiece, which is preferably a pot; as a preference, machine the obtained cast aluminum alloy workpiece , the machining includes removing the leftover material and burrs of the workpiece, and performing sandblasting to remove the oxide skin on the surface of the workpiece;

[0062] Heat treatment: heat-treat the cast aluminum alloy workpiece above at 400°C to 410°C, and keep it warm for 3 hours;

[0063] Hard anodic oxidation treatment: after the heat treatment, the cast aluminum alloy workpiece after heat treatment is subjected to hard anodic oxidation treatment, so that a hard anodic oxidation film is formed on the surface of the cast aluminum alloy workpiece; the conditions of the hard anodic oxidation treatment ...

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Abstract

The invention relates to a hard anodizing treatment method of a cast aluminum alloy workpiece, belonging to the technical field of alloy surface treatment. The invention provides a hard anodizing treatment method of a cast aluminum alloy workpiece in order to solve the problems of poor continuity and low hardness of the existing hard anodizing of an aluminum-silicon cast aluminum alloy. The method comprises the following steps of: melting the aluminum-silicon cast aluminum alloy, and injecting into a die casting machine for die casting formation to obtain a corresponding cast aluminum alloy workpiece; then, performing thermal treatment on the cast aluminum alloy workpiece at 350-450 DEG C; and finally, performing hard anodizing treatment on the cast aluminum alloy workpiece after the thermal treatment so as to form a hard anodizing film on the surface of the cast aluminum alloy workpiece. The method provided by the invention realizes good continuity and high hardness, wherein the hardness can exceed 400HV; and moreover, the fluidity is good in casting, the quality of the cast product is improved, and the yield is high.

Description

technical field [0001] The invention relates to the surface treatment of cast aluminum alloys, in particular to a hard anodic oxidation treatment method for cast aluminum alloy workpieces, and belongs to the technical field of alloy surface treatment. Background technique [0002] Since cast aluminum alloy has high strength and can process complex shapes that other aluminum alloys are difficult to process, it has been widely used in various industries. However, cast aluminum alloy also has some significant disadvantages, such as non-wear resistance and easy corrosion. Therefore, in order to improve the performance of the surface of the cast aluminum alloy, it is necessary to carry out surface treatment on the cast aluminum alloy. [0003] On the other hand, the use of hard anodizing technology is the most excellent performance technology among all surface treatment technologies for aluminum alloys. It has significant advantages such as high film thickness, high hardness, and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/16C22F1/043C22F1/047C22F1/05
Inventor 徐存荣
Owner ZHEJIANG SUPOR CO LTD
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