Abstract
We present the comparative analysis of the data on corrosion characteristics and cyclic corrosion crack-growth resistance of the unused and worn-out metal of feed pipelines of supercritical-pressure power units. It is shown that the electrochemical characteristics of the used metal have are more sensitive to changes in mechanical stresses than those of the new metal and that the influence of organic admixtures to working media may be ambiguous. Thus, e.g., the influence of a mixture of formic acid with 2,4-dinitrophenol is weaker than that exhibited by pure formic acid of the same concentrationC=3000 μg/kg. The characteristics of cyclic corrosion crack-growth resistance of new and worn-out metals from the Uglegorsk and Ladyzhin State Regional Power Plants are substantially different due to the degeneration of the original properties of the metal in the course of long-term operation under service conditions. Different levels of degeneration recorded on different power plants are explained by specific operating conditions of these power plants. On the basis of the statistical data on the operation of supercritical-pressure units, we determine admissible depths of cracklike defects in the walls of pipelines. Their values vary within the range 2–7 mm depending on the designed service life, on the state of the metal, on the composition of working media, and on the shape of the defects.
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