Measurement of pH and corrosion potentials of tube alloys in solutions found in steam generators: Final report
Two of the most important parameters in defining the chemical and corrosion properties of reactor heat transport systems are the electrochemical potential and pH, both measured at the temperature of operation. The overall goal of this research program was to use several techniques developed at SRI over the last several years to measure the pH of various solutions in the temperature range 25C to 300C, and the electrochemical potential of alloy 600 and 690 in these carefully defined solutions. The YSZ pH electrode has the advantage that it can measure the pH in solutions where the hydrogen (platinum) electrode fails because the latter is affected by the redox potential of the solution and by other limitations. After the calibration was complete, the YSZ pH sensor was used to measure the pH of solutions over the temperature range 125C to 300C. In general, both acidic as well as alkaline solutions moved toward neutral pH values with increasing temperature. Finally, the corrosion potentials of Inconel 600 and 690 alloys measured as a function of temperature indicated that, in general, in acidic solutions, both alloys behave similar to the hydrogen electrode. However, in basic and neutral solutions, the potentials of the alloys and the hydrogen electrode were different, possibly due to the presence of dissolved oxygen (175 ppB) in our system.
- Research Organization:
- SRI International, Menlo Park, CA (USA); Electric Power Research Inst., Palo Alto, CA (USA)
- OSTI ID:
- 6305729
- Report Number(s):
- EPRI-NP-5193; ON: TI87920468; TRN: 87-028078
- Country of Publication:
- United States
- Language:
- English
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36 MATERIALS SCIENCE
BWR TYPE REACTORS
STEAM GENERATORS
INCONEL 600
TUBES
INCONEL 690
PWR TYPE REACTORS
ELECTROCHEMICAL CORROSION
EXPERIMENTAL DATA
INCONEL ALLOYS
PH VALUE
REACTOR COOLING SYSTEMS
TEMPERATURE EFFECTS
WATER CHEMISTRY
YTTERBIUM
ZIRCONIUM
ALLOYS
BOILERS
CHEMICAL REACTIONS
CHEMISTRY
CHROMIUM ALLOYS
COOLING SYSTEMS
CORROSION
DATA
ELEMENTS
ENERGY SYSTEMS
INFORMATION
IRON ALLOYS
METALS
NICKEL ALLOYS
NICKEL BASE ALLOYS
NIOBIUM ALLOYS
NUMERICAL DATA
RARE EARTHS
REACTOR COMPONENTS
REACTORS
TRANSITION ELEMENTS
VAPOR GENERATORS
WATER COOLED REACTORS
WATER MODERATED REACTORS
210100* - Power Reactors
Nonbreeding
Light-Water Moderated
Boiling Water Cooled
210200 - Power Reactors
Nonbreeding
Light-Water Moderated
Nonboiling Water Cooled
360105 - Metals & Alloys- Corrosion & Erosion