Abstract
The effects of alternating dissolved oxygen (DO) and dissolved hydrogen (DH) on the corrosion behavior of Alloy 52 are studied by electric/electrochemical methods measured in situ including contact electric resistance (CER) and electrochemical impedance measurements (EIS) together with multiple ex-situ surface analysis techniques including scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) analysis. The film resistance changes cyclically in both DO and DH cycles. In DO cycle film resistance decreases with the increase of corrosion potential (Ecorr) while in DH cycle film resistance shows an opposite trend. The preformed oxide film in a low DO condition can suppress the oxidation rate in middle DO condition, whilst a high DO level can deteriorate the protectiveness of Cr enriched layer. In the DH cycle, the immersion in a low DH condition can increase the resistance in the following high DH condition. All the results indicate the characteristic of oxide formed in one water chemistry is highly influenced by the pre-immersion history, which should be paid much attention in the study of DO or DH effects on the properties of the oxide film and stress corrosion cracking (SCC) initiation.
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