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Magnesium or aluminum metal member provided with black oxide coating, and method for manufacturing same

A technology of black oxidation and aluminum metal, applied in the direction of anodic oxidation, electrolytic coating, surface reaction electrolytic coating, etc., can solve problems such as complicated procedures, and achieve the effect of eliminating the problem of adhesion

Inactive Publication Date: 2020-06-26
TOADENKA CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] However, the above-mentioned conventional anodic oxide coatings formed on magnesium and aluminum metals have a metallic color, and when they are made black in order to suppress light reflection, it is necessary to apply black coloring after forming the anodic oxidation coatings, such as coating , so the process becomes complicated. In addition, there are problems such as the adhesion between the obtained black coating film and the anodized film.

Method used

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  • Magnesium or aluminum metal member provided with black oxide coating, and method for manufacturing same
  • Magnesium or aluminum metal member provided with black oxide coating, and method for manufacturing same
  • Magnesium or aluminum metal member provided with black oxide coating, and method for manufacturing same

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preparation example Construction

[0072] According to the production method of the present invention, since a black oxide film having strong hardness is obtained, a black element is obtained, and therefore, an additional black coating step is not required as in the past.

[0073] Furthermore, even if the shape of the magnesium or aluminum metal member is a complicated shape, cracks and the like are hardly introduced, and a uniform film thickness can be provided.

[0074] Even if an oxide film is formed on the surface of the magnesium metal substrate and aluminum metal substrate used in the production method of the present invention due to contact with air, even if foreign matter such as organic matter adheres, it can be cleaned without special installation. The process is suitable for the preparation method of the present invention.

[0075] In addition, a removal step, a step of cleaning the surface of the magnesium or aluminum metal base material such as degreasing, water washing, etc. if necessary, or a kno...

Embodiment 1

[0112] will have figure 1 The above-mentioned magnesium metal substrate having a shape of , was immersed in an electrolytic solution having the composition shown in Table 1 below, and was subjected to galvanostatic electrolysis using the anodizing conditions shown in Table 2 to perform anodic oxidation.

[0113] [Table 1]

[0114] Element Concentration(g / L) Potassium hydroxide KOH 17 Diammonium hydrogen phosphate (NH 4 ) 2 HPO 4

25 Ammonium Metavanadate NH 4 VO 3

10 ammonium ferric citrate 1.6 Sodium Tungstate Na 2 WO 4

24

[0115] [Table 2]

[0116] current density 5~60A / dm 2

temperature 20～70℃ time 60 seconds to 15 minutes

[0117] Specifically, for figure 1 The shape of the magnesium metal base material is not subjected to special pretreatment. In the electrolyte solution having the composition shown in Table 1 and heated to a temperature of about 50°C, the above-mentioned ...

Embodiment 2

[0128] Except that in the above-mentioned embodiment 1, it is set to 10A / dm 2 , the temperature of the anodic oxidation electrolyte is changed between (1) 20°C, (2) 30°C, (3) 40°C, (4) 50°C, (5) 60°C, the same as the above-mentioned embodiment 1 implement. The various magnesium metal parts obtained are shown in figure 2 (1) ~ (5). All appear black visually.

[0129] The thickness of the obtained anodized film was measured in the same manner as in Example 1 above. The average values ​​of the respective film thicknesses were (1) 19.5 μm, (2) 18.2 μm, (3) 17.1 μm, (4) 14.2 μm, and (5) 9.5 μm (measured with a transmission electron microscope).

[0130] In addition, in the same manner as in Example 1, the anodized coatings of the magnesium metal parts in Examples 2 (1) to (5) were measured by EDS analysis (energy dispersive X-ray analysis: model JSM-5600, manufactured by JEOL Ltd.). The results of the atomic composition of the film surface are shown in Table 4 below.

[0131...

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Abstract

Provided are a magnesium or aluminum metal component and a preparation method thereof. The magnesium or aluminum metal component has a black oxide coating film, instead of a coated black coating film,on a magnesium or aluminum metal substrate having a complex shape,and the black oxide coating film has good hardness and excellent corrosion resistance and is obtained by anode acidification. A magnesium or aluminum metal component provided with the black oxide coating film is the magnesium or aluminum metal component in which an anodic oxide coating film is formed on the magnesium or aluminum metal substrate comprising a magnesium or aluminum metal. The anodic oxide coating film contains vanadium and / or iron in addition to magnesium hydroxide and magnesium oxide or aluminum hydroxide and aluminum oxide. The anodic oxide coating film has a black color in which R, G, and B satisfy 18 < R < 154, 20 < G < 135, and 20 < B < 118.

Description

technical field [0001] The present invention relates to a magnesium or aluminum metal part with a black oxide film (hereinafter referred to as a magnesium or aluminum metal part), and more particularly to a magnesium or aluminum metal part having a black color without coating and its Preparation. [0002] Here, magnesium or aluminum metal is a concept including magnesium metal, magnesium alloy, aluminum metal, and aluminum alloy. Background technique [0003] Magnesium, aluminum, magnesium alloys, and aluminum alloys are widely used in communication devices and various components because of their light weight and good workability. [0004] On the other hand, since magnesium and aluminum are active metals, they are corroded and cannot be used as they are (そのまま), so they are usually used after being coated. However, coating adhesiveness or adhesion was not good, so chemical conversion treatment was performed as coating base treatment. [0005] In particular, when magnesium ...

Claims

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Application Information

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IPC IPC(8): C25D11/30C25D11/06C25D11/14
CPCC25D11/06C25D11/14C25D11/30
Inventor 佐佐木纪明三浦修平金孝真李星衡
Owner TOADENKA CORP
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