Process for improving corrosion resistance of zirconium or zirco

Details Process for improving corrosion resistance of zirconium or zirco Process for improving corrosion resistance of zirconium or zirco

1993-10-28

1995-05-23

Roy, Uppendra

Metal treatment

Process of modifying or maintaining internal physical...

Producing or treating layered, bonded, welded, or...

148421, 148672, 420422, C22C 1600

Patent

active

054177804

ABSTRACT:
A method for fabricating a composite cladding comprised of a moderate-purity metal barrier of zirconium metallurgically bonded on the inside surface of a zirconium alloy tube which improves corrosion resistance. The improved corrosion resistance of the liner is accomplished by suitable heat treatment of the Zircaloy-zirconium composite cladding to allow diffusion of alloying elements, notably Fe and Ni, from the Zircaloy into the zirconium, in particular, to the inner surface of the zirconium liner. This diffusion anneal reduces the undesirable tendency of zirconium liner to oxidize rapidly.

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Rosenbaum et al., "Zirconium-Barrier Cladding Attributes", ASTM STP 939 (1987).

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