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US 2018/0323447 A1Published application
Titanium product, separator and polymer electrolyte fuel cell
AssigneeNippon Steel & Sumitomo Metal Corporation
InventorsJunko IMAMURA, Jun MAKI, Koichi NOSE, Hideya KAMINAKA
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Abstract
This titanium product includes a base metal, and a complex oxide film formed on the surface of the base metal. The base metal has a chemical composition consisting of, by mass %, platinum group elements: 0 to 0.15%, rare earth elements: 0 to 0.1%, and a balance: Ti and impurities. The complex oxide film contains a complex oxide of Ti and one or more elements selected from La, Ce, Nd, Sr and Ca, and has a thickness of 1 to 20 nm. The average grain size at the base metal surface is preferably from 20 to 300 μm.
Claims20
A titanium product, comprising:
- a base metal having a chemical composition consisting of, by mass %,
- platinum group elements:
- 0 to 0.15%,
- rare earth elements:
- 0 to 0.1%, and
- a balance:
- Ti and impurities;
- and
- a complex oxide film formed on a surface of the base metal, the film containing a complex oxide of Ti and one or more elements selected from La, Ce, Nd, Sr and Ca, and having a thickness of 1 to 20 nm.
6 more elements
Dependencies are inferred from the claim text.