Method for treating surface of magnesium-based metal to give metallic texture thereof

Abstract

A method for treating a surface of a magnesium-based metal is disclosed for realizing a metallic texture of the magnesium-based metal. The method includes a buffing step of chemically polishing a surface of a magnesium-based metal by using a chemical polishing agent containing sodium nitride and sodium citrate; an immersing step of immersing the magnesium-based metal, which has been subject to the buffing step, into a strongly alkaline electrolyte solution of pH 11 or above; and an anodizing treatment step of forming a transparent anodizing film on the surface of the magnesium-based metal by applying current with a current density of 0.01 to 1 A / dm2 to the magnesium-based metal in the strongly alkaline electrolyte solution.

Description

BACKGROUND[0001]1. Technical Field[0002]The present disclosure relates to a method for treating a surface of a magnesium-based metal, and more particularly, to a method for treating a surface of a magnesium-based metal to give a metallic texture thereof with an environment-friendly scheme.[0003]2. Description of the Related Art[0004]A magnesium-based metal has been expected to be the most promising engineering material in the future, which can be substituted for an aluminum-based metal, in aspect of weight.[0005]At present, the price of magnesium is substantially equal to that of aluminum, but magnesium is lighter than aluminum. As such, magnesium is more advantageous than aluminum for vehicles, airplanes, laptop computers, cellular phones, etc. in which light weight is more important. For example, in the field of vehicles, magnesium alloys have recently been used instead of steel or aluminum alloys in order to decrease the weight of vehicles for the purpose of improving the fuel ef...

AI Technical Summary

Benefits of technology

[0013]In one embodiment, a method is provided for treating a surface of a magnesium-based metal, in which a more qualified anodizing film may be realized by means of a cheaper and safer chemical polishing process before forming the anodizing film

[0018]It is possible to change the surface of the magnesium-based metal into another surface which is suitable for anodizing by means of a chemical polishing process using a cheaper and safer chemical polishing agent. In addition, by optimally performing the anodizing treatment process on the resultant surface by using an environment-friendly electrolyte solution containing no heavy metals, it is possible to make a high-grade magnesium-based metal product having a transparent anodizing film on the surface thereof, thereby realizing the metallic texture of the magnesium alloy.

Problems solved by technology

If the current density exceeds 1 A / dm2, an irregular oxide film may be generated on the surface of the magnesium-based metal, and such an irregular oxide film gives a difficulty in realizing metallic texture thereof.

Also, if the current density is less than 0.01 A / dm2, it is difficult to form a transparent anodizing film.

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