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Magnesium or magnesium alloy article having electroconductive anodic oxidation coating on the surface thereof and method for production thereof

A technology of anodic oxidation film and manufacturing method, which is applied in the direction of anodic oxidation, can solve problems such as unsatisfactory, achieve excellent corrosion resistance, and reduce manufacturing costs

Inactive Publication Date: 2005-08-10
HORI KINZOKU HYOMEN SHORI INDS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, when the treatment liquid contains heavy metal elements, it is not ideal from the viewpoint of waste liquid treatment and protection of the surrounding environment.

Method used

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  • Magnesium or magnesium alloy article having electroconductive anodic oxidation coating on the surface thereof and method for production thereof
  • Magnesium or magnesium alloy article having electroconductive anodic oxidation coating on the surface thereof and method for production thereof
  • Magnesium or magnesium alloy article having electroconductive anodic oxidation coating on the surface thereof and method for production thereof

Examples

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Embodiment 1

[0064] Using the ASTM No.AZ91D magnesium alloy composed of 90% by weight of magnesium, 9% by weight of aluminum and 1% by weight of zinc as the raw material, an alloy plate with a size of 170mm×50mm×2mm cast by the hot chamber method was used as a test tablet use. The above-mentioned test piece was immersed in an acidic aqueous solution containing 2.2% by weight of phosphoric acid and a small amount of surfactant, and then washed with ion-exchanged water. Next, after immersing in an alkaline aqueous solution containing 18% by weight of sodium hydroxide, it was washed with ion-exchanged water, and the surface of the test piece was pretreated.

[0065] Phosphoric acid aqueous solution and ammonia water were mixed to prepare an electrolytic solution containing 0.25 mol / L of phosphate radical and ammonia or ammonium ions in a total amount of 1.5 mol / L, and maintained at 20°C. The pH of this electrolyte is 11. The magnesium alloy test piece subjected to the above-mentioned pretre...

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Abstract

The invention provides a product, in particular to a magnesium or magnesium alloy product with an anode oxydation coating with conductibility and excellent erosion resistance on the surface, comprising magnesium or a magnesium alloy. The magnesium or magnesium alloy product is characterized in that: an electric anode oxydation coating is arranged on the surface of the magnesium or the magnesium alloy, and the resistance value of the coating surface, mensurated between the two terminals with a mutual distance of 10mm, is below 100 Omega; the magnesium or the magnesium alloy is dipped in the electrolyte with a pH value of 8 to 14 comprising phosphate radical of 0.1 to 1mol / L and ammonia ion or ammonium ion of 0.2 to 5 mol / L, and an anodic oxydation treatment is processed on the surface of the magnesium or the magnesium alloy, and then the product can be manufactured.

Description

technical field [0001] The present invention relates to a product composed of magnesium or a magnesium alloy having an anodized film excellent in electrical conductivity on the surface. It also relates to a method of manufacturing the article. Background technique [0002] Magnesium and magnesium alloys are the lightest among practical metals, so they have high specific strength, good heat dissipation, and excellent recyclability compared to resins, so they have been widely used in electrical equipment and automotive parts in recent years. Among them, it is suitable for use as a casing of an electric device that requires high size and weight reduction, and high requirements for designability and recyclability. However, magnesium and magnesium alloys are prone to corrosion, and thus require corrosion-resistant surface treatment or coating. [0003] Excellent corrosion resistance can be imparted by anodizing magnesium or magnesium alloys. An anodic oxidation treatment is ge...

Claims

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Application Information

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IPC IPC(8): C25D11/30
CPCC25D11/30
Inventor 奥田保广酒井宏司日野实平松实
Owner HORI KINZOKU HYOMEN SHORI INDS
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