Method for forming conversion coating on outer surface of magnesium or magnesium alloy
a technology of conversion coating and magnesium alloy, which is applied in the direction of solid-state diffusion coating, coating, metallic material coating process, etc., can solve the problems of difficult handling, high price of coating solutions used in non-chromate conversion coating processes, and poor corrosion resistance of magnesium alloys, so as to minimize damage to the appearance the effect of improving the corrosion resistance of magnesium or a magnesium alloy
Inactive Publication Date: 2011-05-26
KCCHEM +1
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Benefits of technology
[0011]An object of the present invention is to provide a method for forming a conversion coating on the outer surface of magnesium or a magnesium alloy to improve the corrosion resistance of the magnesium or magnesium alloy.
[0012]Another object of the present invention is to provide a method for forming a conversion coating on the outer surface of magnesium or a magnesium alloy in an environmentally friendly manner.
[0013]Another object of the present invention is to provide a method for forming a conversion coating on the outer surface of magnesium or a magnesium alloy to minimize the damage to the appearance of the magnesium or magnesium even after surface treatment.
Problems solved by technology
Magnesium alloys, however, have the drawback of poor corrosion resistance on account of their material properties.
However, the presence of hexavalent chromium, which was found to be toxic, in the acidic solution limits the use of the Dow processes.
However, coating solutions used in the non-chromate conversion coating processes are highly priced and are difficult to handle.
That is, chromate conversion coatings do not sufficiently express the inherent color of magnesium, impairing the attractive appearance of magnesium alloys.
Method used
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Embodiment Construction
[0024]Exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. However, these embodiments are not intended to limit the scope of the invention. The same reference numerals denote the same parts throughout the drawings.
[0025]FIG. 1 is a magnification image showing a surface texture of a magnesium alloy plate whose surface is treated by a method for forming a conversion coating on the outer surface of magnesium or a magnesium alloy according to an embodiment of the present invention, and FIG. 2 is a flow chart illustrating a method for forming a conversion coating on the outer surface of magnesium or a magnesium alloy according to an embodiment of the present invention.
[0026]It is to be understood that although an explanation is given of a method for the formation of a conversion coating on the surface of a magnesium alloy in order to explain the drawings, a conversion coating can be formed on the surface of a magnesiu...
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Abstract
Disclosed is a method for forming a conversion coating on the outer surface of magnesium or a magnesium alloy by surface treatment with acidic and alkaline solutions. The method is carried out in an environmentally friendly manner to improve the corrosion resistance of the magnesium or magnesium alloy. The method minimizes the damage to the appearance of the magnesium or magnesium even after surface treatment and maximizes the attractive appearance of the magnesium or magnesium alloy.
Description
BACKGROUND[0001]1. Technical Field[0002]The present invention relates to a method for forming a conversion coating on the outer surface of magnesium or a magnesium alloy. More specifically, the present invention relates to a method for forming a conversion coating on the outer surface of magnesium or a magnesium alloy in an environmentally friendly manner to improve the corrosion resistance of the magnesium or magnesium alloy.[0003]2. Description of the Related Art[0004]Magnesium is one of the most abundant elements found on the earth. Magnesium is the most lightweight structural metal material having a density of about 1.74 g / cm3. Based on these advantages, magnesium is currently used in a variety of applications, including aircraft, automobiles and portable device, and its usages and application are increasingly extended.[0005]Magnesium alloys, however, have the drawback of poor corrosion resistance on account of their material properties. For better corrosion resistance, magnesiu...
Claims
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Patent Timeline
Login to View More IPC IPC(8): C23C22/78C23C22/06
CPCC23C22/36C23G1/22C23G1/12C23C22/78C23F1/22
Inventor KIM, HONG GYEUNSEO, KYU HWANLEE, JAE EUNSONG, TAE SEUNGHAN, SEONG HO
Owner KCCHEM