Corrosion rate meter

Abstract

Abstract A corrosion rate meter with test specimen, reference and third electrodes contactable by a corrodent. An isolation amplifier provides an output signal representation of the potential difference between the test and reference electrodes. An output amplifier produces output current having a predetermined relationship to this output signal and a reference current signal representing a certain polarization potential to be established between the test and reference electrodes. A signal correction means stores an integrated corrective signal derived from the current from the output amplifier. The corrective signal adjusts the output signal of the isolation amplifier for a component representing the potential difference between the test and reference electrodes but not the polarization potential component which removes the reference current signal. Then, the output amplifier passes current between the test and third electrodes to produce a polarization potential between the test and reference electrodes. The output signal from the isolation amplifier is now free of both corrective signal components to control the output amplifier to that current magnitude creating the certain polarization potential between the reference and test electrodes. A readout means measures the output current from the output amplifier which is representative of the corrosion rate occurring at the test electrode.

Inventors

• 👤 Homer M Wilson

Bibliographic Details