Noble metal doping or coating of crack interior for strees...

Details Noble metal doping or coating of crack interior for strees... Noble metal doping or coating of crack interior for strees...

G - Physics

21

C

G21C 21/00 (2006.01) B01J 37/03 (2006.01) C23F 11/08 (2006.01) C23F 11/18 (2006.01) C23F 15/00 (2006.01) G01N 17/02 (2006.01) G21C 3/07 (2006.01) G21C 17/02 (2006.01) G21C 17/022 (2006.01) G21C 19/28 (2006.01) G21C 19/30 (2006.01) G21C 21/14 (2006.01)

Patent

CA 2143233

A method for mitigating crack growth on the surface of stainless steel or other metal components in a water- cooled nuclear reactor. A compound containing a noble metal, e.g., palladium, is injected into the water of the reactor in the form of a solution or suspension. This compound has the property that it decomposes under reactor thermal conditions to release ions/atoms of the noble metal which incorporate in or deposit on the in- terior surfaces of the crack. The compound may be or- ganic, organometallic (e.g., palladium acetylacetonate) or inorganic in nature. The palladium deposited inside a crack should exhibit catalytic behavior even if the bulk surface palladium is depleted under high fluid flow conditions. As a result, the electrochemical potential inside the crack is decreased to a level below the crit- ical potential to protect against intergranular stress corrosion cracking.

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