Titanium plate material for fuel cell separators with excellent surface conductivity and durability, and method for manufacturing the same.

A titanium plate material with a controlled Si content and surface coating layer addresses the challenges of high costs and conductivity issues in fuel cell separators by ensuring low contact resistance and durability without coatings, achieving 10 mΩcm² resistance and maintaining performance in fuel cells.

JP7885454B2Active Publication Date: 2026-07-06POHANG IRON & STEEL CO LTD
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
POHANG IRON & STEEL CO LTD
Filing Date
2023-09-04
Publication Date
2026-07-06

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Abstract

The present invention aims to provide a fuel cell separator material that simultaneously ensures manufacturing cost, conductivity, and durability by adjusting the composition of the titanium (Ti) base material and easily forming a conductive oxide layer on the surface coating layer, and does not require additional coating. [Solution] A titanium separator plate material with excellent surface conductivity and durability is disclosed. The titanium plate material for a fuel cell separator plate according to the present invention comprises a Ti base material consisting of, by mass%, 0.001 to 0.09% Si, the remainder Ti, and unavoidable impurities, and a surface coating layer in which the contents of Ti, Si, and O measured by X-ray angle-resolved photoelectron spectroscopy using an Al-Kα X-ray source at a photoelectron takeoff angle of 45° are each greater than 0%. The surface coating layer is characterized by satisfying the following formula (1): Formula (1): 0.2 ≦ Si(at.%) / [Ti(at.%)+Si(at.%)] ≦ 0.8
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Citation Information

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