Abstract
This paper describes a study performed to establish the real in situ electrochemical potential (ECP) prevalent in 40 MW deaerator feedwater storage vessel weldments. It was demonstrated that (a) the Ag AgCl reference electrode sensibly recorded the ECP over a period of 1000 h before failure, (b) transients (in the positive, more active direction) were the result of abrupt working unit initial load changes, (c) an initial ECP hysteresis lasting 400–500 h was recorded where the values remained much more positive than those normally associated with low dissolved oxygen levels and (d) a strong effect of weldment surface condition was evident inasmuch as the ECP values of the fresh bright weldment were consistently approximately 150 mV more positive than for the normal oxidised weldment.
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