![]() In this case, the EIS curve had a capacitive loop type, which denotes a corrosive process not followed by hydrogen uptake. The addition of H202 to the alkaline environment caused a depletion of the cyanide content and therefore decreased the permeation current even when the current was already low. The depletion of cyanide caused the permeation current to decrease and the EIS curve in the Nyquist plot to open, indicating a non-corrosive environment. The addition of cyanide to the alkaline wet H2S environment caused a high permeation current and a closed capacitive loop in the Nyquist plot of the EIS diagram. ![]() It was established that both, EIS and permeation curves, should be used together to identify the environment severity. The program evaluated how well EIS and permeation techniques were able to distinguish between wet H2S alkaline environments with different corrosion and hydrogen charging severity. ![]() ![]() A test program, part of a major project, was carried out to develop and evaluate a probe that would allow fast hydrogen permeation readings and also Electrochemical Impedance Spectroscopy, EIS, measurements in refineries. ![]()
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