Insulated protective coating for mitigation of stress...

G - Physics – 21 – C

Patent

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G21C 21/00 (2006.01) C23C 4/10 (2006.01) C23F 15/00 (2006.01) G21C 1/01 (2006.01) G21C 3/07 (2006.01) G21C 3/20 (2006.01) G21C 11/00 (2006.01) G21C 11/08 (2006.01) G21C 13/02 (2006.01) G21C 13/087 (2006.01)

Patent

CA 2145895

A method for mitigating crack initiation and prop- agation on the surface of metal components in a water- cooled nuclear reactor. An electrically insulating coating is applied on the surfaces of IGSCC-susceptible reactor components. The preferred electrically insu- lating material is yttria-stabilized zirconia. The presence of an electrically insulating coating on the surface of the metal components shifts the corrosion potential in the negative direction without the addition of hydrogen and in the absence of noble metal catalyst. Corrosion potentials ?-0.5 Vshe can be achieved even at high oxidant concentrations and in the absence of hydrogen.

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