Effects of dissolved oxygen on partial slip fretting corrosion of Alloy 690TT in high temperature pure water

Partial slip fretting corrosion of Alloy 690TT comes up in the steam generator of a nuclear power plant, in which the damage mechanisms are transformed as dissolved oxygen (DO) varies. In this work, the coupling between the action of oxide particles sticking into the surface and the electrochemical corrosion caused severe pitting-like damage, which was enhanced by an increase in DO concentration increasing the wear volume. The initiation of fatigue cracking was controlled by the slip dissolution along with the competition between the film rupture rate and the repassivation rate as DO changes. (C) 2020 Elsevier B.V. All rights reserved.