Treatment of stainless steel and similar alloys to reduce hydrog

Details Treatment of stainless steel and similar alloys to reduce hydrog Treatment of stainless steel and similar alloys to reduce hydrog

1975-10-14

1976-07-13

Kendall, Ralph S.

Metal treatment

Compositions

Heat treating

148 635, 427405, C23F 702

Patent

active

039691519

ABSTRACT:
Outgassing of hydrogen from high-vacuum system components made of stainless steel and similar alloys can be minimized if the metal surfaces to be exposed to the vacuum are treated according to the technique disclosed herein. First, an adherent layer comprising a mixture of oxides and nitrides is formed on the metal surfaces. This oxide and nitride mixture layer serves as a barrier to hydrogen diffusion. Then, a reduced layer having a low heat of adsorption for water is formed on the exposed surface of the oxide and nitride mixture layer. This reduced layer is made sufficiently thin to preclude outgassing of significant amounts of hydrogen into the vacuum system. In effect, a vacuum envelope is formed which outgasses only from a thin layer of reduced oxide.

REFERENCES:
patent: 2442223 (1948-05-01), Uhleg
patent: 2703298 (1955-03-01), Branson et al.
patent: 2960421 (1960-11-01), Erxeben
patent: 3345218 (1967-10-01), Brookover et al.

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