Method of producing titanium material resistant to hydrogen abso

Details Method of producing titanium material resistant to hydrogen abso Method of producing titanium material resistant to hydrogen abso

1994-03-14

1995-03-07

Dean, Richard D.

Metal treatment

Process of modifying or maintaining internal physical...

Carburizing or nitriding using externally supplied carbon or...

148316, 148317, 148278, 148281, 134 3, C23C 854

Patent

active

053954610

ABSTRACT:
A method of producing a titanium material having enhanced resistance to hydrogen absorption in aqueous hydrogen sulfide solutions which comprises removing a layer of at least 0.5 .mu.m depth from the surface of a titanium material that has been annealed after cold rolling so that titanium nitride, titanium carbide, or titanium carbonitride formed on the surface is removed. It is preferable that the titanium material has no flaw in the depth beyond 10 .mu.m from the surface. It is desirable that the titanium material is polished so that it has a surface roughness Rmax not exceeding 3.0 .mu.m. It is also preferred that the titanium surface has an oxide film ranging in thickness from 15 to 500 nm formed thereon.

REFERENCES:
patent: 4908072 (1990-03-01), Taki et al.
patent: 5051140 (1991-09-01), Mushiake et al.
A. Z. Foroulis, "Corrosion and Hydrogen Embrittlement Behavior of Titanium in Aqueous Sulfidic Solutions", Boshoku Gijutsu, pp. 113-121 (1980).
L. C. Covington, "The Influence of Surface Condition and Environment on the Hydriding of Titanium", National Association of Corrosion Engineers, pp. 378-382 (1979).
Kazutoshi Shimogori et al., "Case Analyses of Hydrogen Absorption Embrittlement of Titanium Used in Practical Equipment", Kobe Steel Engineering Reports vol 35, No. 4, pp. 63-66 (1985).

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