Electrochemical corrosion rate probes have been constructed and tested along with mass loss coupons in an air plus water vapor and a N2/O2/CO2 plus water vapor environment. Temperatures ranged from 200° to 700°C. Results show that electrochemical corrosion rates for ash-covered mild steel are a function of time, temperature and process environment. Correlation between the electrochemical and mass loss corrosion rates was poor.

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