Manganese biofouling of stainless steel: Deposition rates and influence on corrosion processes
Book
·
OSTI ID:382555
- Montana State Univ., Bozeman, MT (United States)
Corrosion potential (E{sub corr}) for 316L stainless steel coupons was monitored during 9 days in situ exposure to fresh river water. E{sub corr} increased at 300 mV day{sup {minus}1} reaching potentials of +350 mV (SCE) within 48 hours, then remained fixed at this potential. The coulometric reduction technique was used to determine rate and total abundance of cathodically active manganese biofouling during the exposure. A deposition rate of 0.57 mcoul cm{sup {minus}2} d{sup {minus}1} was measured during the initial 7 days, increasing to 3.1 mcoul cm{sup {minus}2} d{sup {minus}1} between day 7 and 9. Based on a one-electron reduction of MnO{sub 2} to MnOOH, 8.8 {micro}g cm{sup {minus}2} electroactive MnO{sub 2} was deposited during the 9 day exposure. Comparison with published data for manganese deposition in drinking water distribution systems suggests rapid biological MnO{sub 2} deposition consistent with the rapid rate of Ennoblement. Deposition rate is used to estimate the potential impact of manganese biofouling on stainless steel pitting.
- OSTI ID:
- 382555
- Report Number(s):
- CONF-960389--
- Country of Publication:
- United States
- Language:
- English
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