Prestabilized chromium protective film to reduce radiation buildup
Patent
·
OSTI ID:6977344
This patent describes a method for retarding buildup of radioactive materials on a water exposed steel surface of a pipe which forms a part of a water system of a light water nuclear reactor. It comprises preparing the water exposed steel surface to obtain a clean base metal starting surface; depositing a chromium film at least five hundred Angstroms thick on the pipe surface from a solution of chromic acid and sulfuric acid under controlled electrochemical deposition conditions; exposing the deposited chromium film and the underlying base metal to a gaseous oxygen source at temperatures between 150[degrees] C and 450[degrees] C to obtain a thin stabilized chromium-rich oxide film on the exposed surface of the deposited chromium film; and, using the chromium-coated pipe with an oxide film as a portion of the water system of the light water nuclear reactor.
- Assignee:
- Electric Power Research Inst., Palo Alto, CA (United States)
- Patent Number(s):
- A; US 5147597
- Application Number:
- PPN: US 7-682613
- OSTI ID:
- 6977344
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
210100 -- Power Reactors
Nonbreeding
Light-Water Moderated
Boiling Water Cooled
210200 -- Power Reactors
Nonbreeding
Light-Water Moderated
Nonboiling Water Cooled
36 MATERIALS SCIENCE
360106 -- Metals & Alloys-- Radiation Effects
360206* -- Ceramics
Cermets
& Refractories-- Radiation Effects
ALLOYS
BUILDUP
CHALCOGENIDES
CHEMICAL REACTIONS
CHROMIUM COMPOUNDS
CHROMIUM OXIDES
COATINGS
CONTAINERS
CORROSION
CORROSION PROTECTION
CORROSIVE EFFECTS
DESIGN
ELECTROCHEMICAL CORROSION
ENGINEERING
HARDENING
HYDROGEN COMPOUNDS
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS
MATERIALS TESTING
OXIDES
OXYGEN COMPOUNDS
PHYSICAL RADIATION EFFECTS
PROTECTIVE COATINGS
RADIATION EFFECTS
RADIATION HARDENING
RADIOACTIVE MATERIALS
REACTOR COMPONENTS
REACTOR VESSELS
REACTORS
SAFETY ENGINEERING
STEELS
TESTING
TRANSITION ELEMENT COMPOUNDS
WATER
WATER COOLED REACTORS
210100 -- Power Reactors
Nonbreeding
Light-Water Moderated
Boiling Water Cooled
210200 -- Power Reactors
Nonbreeding
Light-Water Moderated
Nonboiling Water Cooled
36 MATERIALS SCIENCE
360106 -- Metals & Alloys-- Radiation Effects
360206* -- Ceramics
Cermets
& Refractories-- Radiation Effects
ALLOYS
BUILDUP
CHALCOGENIDES
CHEMICAL REACTIONS
CHROMIUM COMPOUNDS
CHROMIUM OXIDES
COATINGS
CONTAINERS
CORROSION
CORROSION PROTECTION
CORROSIVE EFFECTS
DESIGN
ELECTROCHEMICAL CORROSION
ENGINEERING
HARDENING
HYDROGEN COMPOUNDS
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS
MATERIALS TESTING
OXIDES
OXYGEN COMPOUNDS
PHYSICAL RADIATION EFFECTS
PROTECTIVE COATINGS
RADIATION EFFECTS
RADIATION HARDENING
RADIOACTIVE MATERIALS
REACTOR COMPONENTS
REACTOR VESSELS
REACTORS
SAFETY ENGINEERING
STEELS
TESTING
TRANSITION ELEMENT COMPOUNDS
WATER
WATER COOLED REACTORS