Aluminum conductive member and method for producing same

Abstract

Provided are an aluminum conductive member that includes an electrical connection portion excellent in conductivity and rust resistance and an electrical insulation portion excellent in long-term durability, chemical resistance, and the like, and can be manufactured at low cost, and a method of manufacturing the same. Specifically, provided are an aluminum conductive member, including: an aluminum conductive base material formed of an aluminum material including aluminum or an aluminum alloy; an electrical connection portion formed in a region of the aluminum conductive base material, the electrical connection portion having a surface coated with a conductive oxidation preventing film and being used as a terminal; and an electrical insulation portion formed in a region of the aluminum conductive base material other than the region in which the electrical connection portion is formed, the electrical insulation portion being coated with an anodic oxide film, and a method of manufacturing the same.

Claims

1. A method of manufacturing an aluminum conductive member the method comprising the steps of: providing an aluminum conductive base material comprising aluminum or an aluminum alloy; subjecting an entire surface of the aluminum conductive base material to an anodic oxidation treatment so that an anodic oxide film, as an electrical insulation portion, is formed on the aluminum conductive base material; partially removing the anodic oxide film from the aluminum conductive base material to form a region to serve as an electrical connection portion; and coating a conductive coating agent for preventing oxidation to the region in which the anodic oxide film is removed to form a conductive oxidation preventing film on the surface of the aluminum conductive base material, so that the electrical connection portion coated with the conductive oxidation preventing film is formed, wherein the conductive coating agent for preventing oxidation is a conductive coating agent obtained by mixing conductive powder into grease or by adding a conductive filler and an oxidation preventing agent to a binder resin.

2. The method of manufacturing an aluminum conductive member according to claim 1, wherein the anodic oxide film formed on the surface of the aluminum conductive base material is removed by polishing treatment.

3. A method of manufacturing an aluminum conductive member the method comprising the steps of: providing an aluminum conductive base material comprising aluminum or an aluminum alloy; forming a protective film on a surface of aluminum conductive base material in a region to serve as an electrical connection portion; subjecting a region of the aluminum conductive base material other than the region in which the protective film is formed to anodic oxidation treatment to form the anodic oxide film, as an electrical insulation portion, on the surface of the aluminum conductive base material; removing the protective film from the surface of the aluminum conductive base material; and coating a conductive coating agent for preventing oxidation to the region to serve as the electrical connection portion to form a conductive oxidation preventing film on the surface of the aluminum conductive base material, so that the electrical connection portion coated with the conductive oxidation preventing film is formed, wherein the conductive coating agent for preventing oxidation is a conductive coating agent obtained by mixing conductive powder into grease or by adding a conductive filler and an oxidation preventing agent to a binder resin.

Description

DESCRIPTION OF EMBODIMENTS

(1) Embodiments of the present invention are hereinafter described by way of Example.

EXAMPLE

(2) An aluminum conductive base material measuring 200 mm×30 mm×4 mm was cut out from an A1100 aluminum material having a thickness of 4 mm. The aluminum conductive base material was subjected to anodic oxidation treatment in a sulfuric acid electrolytic bath having a concentration of sulfuric acid of 160 g/L under the treatment conditions of a bath temperature of 9° C., a DC current density of 400 A/m.sup.2, and a treatment time period of 60 min. Thus, an anodic oxide film having a thickness of 60 μm was formed on the entire surface of the aluminum conductive base material.

(3) Next, the anodic oxide film formed on the surface of the aluminum conductive base material was subjected to polishing treatment and removed in regions within 1 cm from both ends of the aluminum conductive base material in a length direction thereof. A conductive coating agent (trade name: Nikkei Jointal Z, manufactured by Shizuoka Kosan Co., Ltd.) was applied to the regions in which the anodic oxide film was removed, to form a conductive oxidation preventing film. Thus, a test piece (aluminum conductive member) including an electrical insulation portion coated with the anodic oxide film and electrical connection portions coated with the conductive oxidation preventing film was prepared.

(4) The obtained test piece was examined for conductivity between the electrical connection portions formed at the both ends with a tester. As a result, satisfactory conduction was confirmed. In addition, the obtained test piece was examined for conductivity of the electrical insulation portion between the electrical connection portions with the tester. As a result, conduction was not observed, and a satisfactory insulating property was confirmed.

(5) As is apparent from the results, the aluminum conductive member including the electrical insulation portion coated with the anodic oxide film and the electrical connection portion coated with the conductive oxidation preventing film can be used as an insulated bus bar, an insulated bus duct, or the like, and can be utilized in the fields of various devices for receiving and distributing electric power, controlling devices, and the like.