U.S. Department of EnergyOffice of Scientific and Technical Information
Measurement of pH and corrosion potentials of tube alloys in solutions found in steam generators: Final report
Abstract
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 andmore »
- Authors:
- Publication Date:
- Research Org.:
- SRI International, Menlo Park, CA (USA); Electric Power Research Inst., Palo Alto, CA (USA)
- OSTI Identifier:
- 6305729
- Report Number(s):
- EPRI-NP-5193
ON: TI87920468; TRN: 87-028078
- Resource Type:
- Technical Report
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS; 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
Citation Formats
Hettiarachchi, S, Lenhart, S J, and Macdonald, D D. Measurement of pH and corrosion potentials of tube alloys in solutions found in steam generators: Final report. United States: N. p., 1987.
Web.
Hettiarachchi, S, Lenhart, S J, & Macdonald, D D. Measurement of pH and corrosion potentials of tube alloys in solutions found in steam generators: Final report. United States.
Hettiarachchi, S, Lenhart, S J, and Macdonald, D D. 1987.
"Measurement of pH and corrosion potentials of tube alloys in solutions found in steam generators: Final report". United States.
@article{osti_6305729,
title = {Measurement of pH and corrosion potentials of tube alloys in solutions found in steam generators: Final report},
author = {Hettiarachchi, S and Lenhart, S J and Macdonald, D D},
abstractNote = {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.},
doi = {},
url = {https://www.osti.gov/biblio/6305729},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri May 01 00:00:00 EDT 1987},
month = {Fri May 01 00:00:00 EDT 1987}
}