Device for thermal electric and nuclear power plants
AssigneeMitsubishi Jukogyo Kabushiki Kaisha
InventorsIsamu Kita, Masayuki Kobashi, Susumu Tabuchi, Yoshiyuki Doi, Noboru Nakamura, Managu Ishihara, Koji Arioka, Isamu Kayano
Life of this patent
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Abstract
For the purpose of preventing reductions of wall thickness due to erosion-corrosion in parts (2, 3, 7) of a system made of carbon steel, and which constitute a wet steam system, a feedwater and condensate system, and a drain system of a thermal or nuclear power plant, a coating (17) of metal or ceramic which is chemically stable against a fluid flowing in the systems is formed by spraying on the surface of the devices which are exposed to the fluid.
Claims7
A protective coating for steel in at least part of a system constituting at least one of a wet steam system, a feedwater and condensate system, and a drain system of thermal and nuclear power plants, said system being exposed to a fluid flowing therein, said coating comprising:
- a a film layer of a material selected from the group consisting of a metal comprising a major component other than Fe and a ceramic, said material being formed on a surface of the system to be protected by a spraying technique selected from the group consisting of atmospheric plasma thermal spraying and high energy plasma thermal spraying so that said film layer is a boundary film chemically stable against said fluid flowing through said system and resistant against the efflux of Fe.sup.2+ to prevent erosion-corrosion of said coated part of said system.
Dependencies are inferred from the claim text.