Noble metal doping or coating of crack interior for stress corro

Induced nuclear reactions: processes – systems – and elements – Reactor protection or damage prevention – Corrosion or damage prevention

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376306, 422 11, 422 14, 422 19, G21C 900

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active

056006918

ABSTRACT:
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 interior surfaces of the crack. The compound may be organic, 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 critical potential to protect against intergranular stress corrosion cracking.

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3rd Symposium on Chemical Perspectives of Microelectronics Material, Boston, USA, Nov. 30-Dec. 3, 1992, Mat. Res. Soc. Symp. Proc. vol. 282, pp. 353-358, Kowalczyk et al., "Characterization of Palladium Acetylacetonate as a CVD Precursor for Pd Metallization".
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