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Mg or Mg-Alloy Housing and Method for Producing the Same

a technology of alloy and housing, applied in the direction of metal material coating process, etc., can solve the problems of poor workability, cumbersome operation, difficulty in maintaining sufficient strength of resin housing, etc., and achieve the effect of reducing correction, enhancing coating yield and reducing cos

Inactive Publication Date: 2009-10-08
FUJITSU LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0011]Therefore, with the foregoing in mind, it is an object of the present invention to provide a Mg or Mg-alloy housing in which a chemical conversion film is formed simply on a surface of a molded product made of Mg or a Mg-alloy so as to reduce the correction by puttying, a coating yield is enhanced, and a cost can be reduced, and a method for producing the Mg or Mg-alloy housing.

Problems solved by technology

However, in the case where the equipment is reduced in thickness, it is difficult to maintain sufficient strength with a resin housing.
There are the following problems in producing a product using Mg or a Mg-alloy as a material.
At present, the burr is removed manually or mechanically by punching with a press, cutting, or the like, any of which is a cumbersome operation.
Dust particles of Mg, a Mg-alloy or grains are likely to be generated and scatter, resulting in poor workability and high danger of explosion of dust particles.
Thus, the pretreatment of the chemical conversion treatment needs to have several processes such as degreasing, washing, a surface adjustment treatment by etching, and the like, which makes the operation cumbersome, complicates a treatment apparatus, and increases a treatment cost.
In the molded product produced by die casting, Thixo molding, or the like, molding defects such as a draw, a void, a hot water flow, and the like occur.
At this time, buffing is performed manually which makes it cumbersome to perform the inspection, and may generate dust particles during buffing.
Furthermore, a defective molded product needs to be corrected by puttying before the chemical conversion treatment, decreasing a yield and increasing a cost.

Method used

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  • Mg or Mg-Alloy Housing and Method for Producing the Same
  • Mg or Mg-Alloy Housing and Method for Producing the Same
  • Mg or Mg-Alloy Housing and Method for Producing the Same

Examples

Experimental program
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example 1

[0036]As a target member to be treated, a notebook computer housing (length: 329 mm, width: 274 mm, height: 2 mm) produced by subjecting Mg or a Mg-alloy of ASTM AZ91D to Thixo molding was used. Thixo molding was performed as follows: Mg or a Mg alloy in a semi-molten or molten state was extruded from an extruder at about 600° C. to a mold at about 250° C. to obtain a molded product. FIG. 1 shows a surface treatment process.

[0037]As a chemical conversion treatment agent, a mixture containing 80% by mass of “Grander-Finer MC1000” (produced by Million Chemical Co., Ltd.: 15 to 25% by mass of phosphoric acid, 10 to 15% by mass of manganese compound, and 10 to 20% by mass of calcium compound) and 20% by mass of alumina (Macorundum A#320, produced by Macoho Co., Ltd.) with an average particle size of 40 μm as an abrasive was used. Wet blast was performed using WFB-2-2C produced by Macoho Co., Ltd. under the following condition: a compression air pressure was 0.2 MPa, a pump pressure was ...

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Abstract

A surface of a Mg or Mg-alloy housing of the present invention is subjected to wet blast using a mixture containing a chemical conversion treatment agent and an abrasive, whereby a chemical conversion film is formed on the surface of the Mg or Mg-alloy housing. Because of this, a chemical conversion film is formed simply on the surface of a molded product made of Mg or a Mg-alloy to reduce the correction by puttying, whereby a Mg or Mg-alloy housing is provided in which a decrease in yield and an increase in cost can be prevented.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a Mg or Mg-alloy housing in which a chemical conversion film is formed simply on a surface of a molded product made of Mg or a Mg-alloy so as to improve the yield of coating, and a method for producing the Mg or Mg-alloy housing.[0003]2. Description of the Related Art[0004]Recently there are increasing chances that mobile equipment such as a notebook computer and a personal digital assistant (PDA) is carried for outdoor use. Along with this, there is an increasing demand for the miniaturization and the reduction in weight and thickness of equipment, and hence, the reduction in thickness of a housing occupying 30% of the entire mass of the equipment is required. However, in the case where the equipment is reduced in thickness, it is difficult to maintain sufficient strength with a resin housing. Furthermore, the amount of heat generated by a microprocessor unit (MPU) of a notebook compute...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C23C22/57C23C22/00C23C22/07C23C22/73
CPCC23C22/74B24C1/083B24C11/005
Inventor KIMURA, KOICHIFUJIWARA, TAKAYUKI
Owner FUJITSU LTD
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