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Surface treatment method of titanium material for electrodes

a surface treatment method and electrode technology, applied in heat treatment equipment, furnaces, manufacturing tools, etc., can solve problems such as oxygen deficiency type titanium oxide layers, and achieve excellent electrical conductivity, corrosion resistance, and hydrogen absorption resistan

Inactive Publication Date: 2009-08-27
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a surface treatment method for titanium material for electrodes that improves its electrical conductivity, corrosion resistance, and hydrogen absorption resistance. This is achieved by forming a titanium oxide layer on the surface of the titanium material and further depositing a noble metal layer on top of it through a heat treatment process. This method can be used to manufacture fuel cells using titanium material for electrodes that maintain excellent performance for a long period of time.

Problems solved by technology

Further, a part of oxygen in the titanium oxide layer is diffused into the titanium material, resulting in an oxygen deficiency type titanium oxide layer.

Method used

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  • Surface treatment method of titanium material for electrodes
  • Surface treatment method of titanium material for electrodes

Examples

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examples

[0053]Below, Examples whereby the advantages of the present invention have been confirmed will be described by comparison with Comparative Examples not satisfying the requirements of the present invention.

first example

[0054]In First Example, the surface treatment method by a heat treatment in an air atmosphere as the titanium oxide layer formation step S1 was evaluated.

(Surface Treatment of Test Plate)

[0055]The test plate used was treated in the following manner. First, a titanium material (2 cm in width×5 cm in length×0.2 mm in thickness) formed of class 1 pure titanium specified according to JIS H 4600 was, as the pickling treatment step S11, subjected to ultrasonic cleaning in acetone. Then, the titanium material was subjected to a pickling treatment in a mixed aqueous solution of 1 mass % hydrofluoric acid and 5 mass % nitric acid, and cleaned with pure water, and dried. Then, as the titanium oxide layer formation step S1, a heat treatment in an air atmosphere was carried out under the heat treatment conditions (temperature and time) shown in Table 1. The thickness of the titanium oxide layer formed on the heat treated test plate surface was measured by observation under a transmission electr...

second example

[0071]In Second Example, evaluation of the surface treatment method by an anodic oxidation treatment as the titanium oxide layer formation layer S1 was carried out.

(Surface Treatment of Test Plate)

[0072]Each used test plate was treated in the following manner. First, a titanium material (2 cm in width×5 cm in length×1 mm in thickness) formed of class 1 pure titanium specified according to JIS H 4600 was, as the pickling treatment step S11, subjected to ultrasonic cleaning in acetone. Then, the titanium material was subjected to a first pickling treatment in a 4 mass % hydrofluoric acid aqueous solution. Then, the titanium material was subjected to a second pickling treatment in a mixed aqueous solution of 0.5 mass % hydrofluoric acid and 5 mass % hydrogen peroxide, and then cleaned with pure water, and dried. Then, as the titanium oxide layer formation step S1, an anodic oxidation treatment was carried out at the voltage and for the holding time shown in Table 2 in a room-temperatur...

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Abstract

Disclosed herein is a surface treatment method of a titanium material for electrodes characterized by including: a titanium oxide layer formation step S1 of forming a titanium oxide layer with a thickness of 10 nm or more and 80 nm or less on the surface of a titanium material including pure titanium or a titanium alloy; a noble metal layer formation step S2 of forming a noble metal layer with a thickness of 2 nm or more including at least one noble metal selected from Au, Pt, and Pd on the titanium oxide layer by a PVD method; and a heat treatment step S3 of heat treating the titanium material having the noble metal layer formed thereon at a temperature of 300° C. or more and 800° C. or less.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a titanium material for electrodes. More particularly, it relates to a surface treatment method of a titanium material for an electrode suitable for a separator made of titanium for a fuel cell.[0003]2. Description of the Related Art[0004]As distinct from the primary cell of a dry cell or the like, and the secondary cell of a lead storage battery or the like, the fuel cell capable of continuously extracting electric power by continuing supplying a fuel such as hydrogen and an oxidant such as oxygen is high in electric power generation efficiency, is not largely affected by the size of the system scale, and makes less noise and vibration. For this reason, the fuel cell is expected as an energy source covering various uses / scales. Then, the fuel cells have been developed as, specifically, a polymer electrolyte fuel cell (PEFC), an alkaline electrolyte fuel cell (AFC), a phosphoric acid fue...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C23C8/10C21D9/00
CPCH01M8/0206Y02E60/50H01M8/0228H01M8/0215
Inventor SUZUKI, JUNSATO, TOSHIKIHISAMOTO, JUNITO, YOSHINORITANIFUJI, SHINICHIYASHIKI, TAKASHI
Owner KOBE STEEL LTD
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