Insulated protective coating for mitigation of stress corrosion

Details Insulated protective coating for mitigation of stress corrosion Insulated protective coating for mitigation of stress corrosion

1994-04-11

1995-11-07

Nelson, Peter A.

Induced nuclear reactions: processes, systems, and elements

Reactor protection or damage prevention

Corrosion or damage prevention

376249, 376425, 376414, 376256, G21C 900

Patent

active

054652812

ABSTRACT:
A method for mitigating crack initiation and propagation 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 insulating 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 .ltoreq.-0.5 V.sub.she can be achieved even at high oxidant concentrations and in the absence of hydrogen.

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