The oxidation-reduction (redox) electrode studies at Pacific Northwest Laboratory (PNL) were completed with the examination of the sulfide-sulfate system. This system is extremely reducing, and it was concluded that the redox electrode would still respond to the entry of oxygen even though sulfide is an oxygen getter. The corrosion rate of platinum in oxygenated brine was determined at 2500 C. It was concluded that the mechanism of response to oxygen fits a mixed potential model. Work began on the improved corrosion rate meter (ICR). A potentiostat and programmer were constructed and successfully tested. Corrosion tests were carried out in 250 C brine with and without oxygen, and the ICR response was very good when compared to corrosion rates determined by weight loss.
Interim Report Pacific Northwest Lab
- Pub Date:
- September 1981
- Corrosion Prevention;
- Geothermal Technology;
- Measuring Instruments;
- Instrumentation and Photography