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

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...

AI Technical Summary

Benefits of technology

The present invention provides a method for producing a Mg or Mg-alloy housing with a chemical conversion film that reduces the need for puttying, improves coating yield, and reduces cost. The method involves subjecting the surface of the Mg or Mg-alloy housing to wet blast using a solution containing a chemical conversion treatment agent and an abrasive. This results in a simultaneous formation of unevenness and the chemical conversion film on the surface of the housing. The technical effects of this invention include improved surface quality, reduced labor costs, and improved durability of 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.

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