Nuclear steam generator chemical cleaning passivation solution

Details Nuclear steam generator chemical cleaning passivation solution Nuclear steam generator chemical cleaning passivation solution

1995-03-22

1996-12-24

Silverberg, Sam

Metal treatment

Process of modifying or maintaining internal physical...

Processes of coating utilizing a reactive composition which...

134 3, 134 2, C23C 2260

Patent

active

055870252

ABSTRACT:
A method for passivating the surfaces of a nuclear steam generator and a solution therefor includes EDTA and hydrogen peroxide in a temperature range of 37.degree. C. to 49.degree. C. The solution is adjusted to have a pH of between about 9.2 and 9.5 and used on the surfaces for two hours or more for passivating the surfaces.

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W. Frenier et al., "Passivation of Steel in Ammonium EDTA Solutions", NACE Corrosion 85, Boston, Mass., Mar. 25, 1985 pp. 189/1-189/16.

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