Method of treating zirconium-based alloy tubes

Details Method of treating zirconium-based alloy tubes Method of treating zirconium-based alloy tubes

1981-02-18

1982-12-21

Kendall, Ralph S.

Metal treatment

Compositions

Heat treating

427 6, 427231, 427309, 427405, C23F 702

Patent

active

043647812

ABSTRACT:
In the process of applying a layer of copper and a layer of zirconium dioxide to the internal surface of a tube of a zirconium-based alloy, with the layer of zirconium dioxide being located between the copper layer and the internal surface of the tube, the tube surface is first treated with an activating solution in the form of an aqueous solution containing from about 1 to about 3 grams/liter of hydrogen fluoride, from about 2 to about 8 grams/liter of ammonium fluoride and from about 0.1 to about 0.5 gram/liter of sulfuric acid, the amounts of hydrogen fluoride and ammonium fluoride being chosen so that the amount of ammonium fluoride, calculated in moles, exceeds the amount of hydrogen fluoride, calculated in moles, by at least 5 percent.

REFERENCES:
patent: 4017368 (1977-04-01), Wax et al.
patent: 4284660 (1981-08-01), Donaghy et al.
Schickner et al., J. of the Electrochemical Soc., vol. 100, Jun. 1953, pp. 289-291.

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