Electrochemical corrosion rate sensors work in high temperature waste incineration applications
where ash is deposited. The ash serves as the electrolyte for electrochemical measurements, such as
liner polarization resistance, electrochemical noise, and harmonic distortion analyses. Results to date
have shown that these types of sensors respond qualitatively to changes in temperature, gas composition,
alloy composition, and type of ash. Several years of research have shown that high temperature
corrosion rate probes need to be better understood before corrosion rate can be used as a process
variable by power plant operators. More recent research has shown that electrochemical corrosion
probes typically measure lower corrosion rates than those measured by standard mass loss techniques.
While still useful for monitoring changes in corrosion rates, absolute probe corrosion rates will need a
calibration factor to be useful. Ideas for research that may help resolve these issues are presented.