Abstract
The effects of dissolved hydrogen (DH) on the corrosion behavior of Alloy 182 in high temperature (320°C) water were studied using in situ electrochemical measurements and ex situ surface analyses. The film resistance and thickness increased with decreasing DH. Under conditions of DH=50cm3/kg and 30cm3/kg, the oxide film was very thin and predominantly consisted of Cr3+. At DH=5cm3/kg, the oxide film grew thicker, and the outer part consisted of NiO and spinel, with Cr3+ primarily located in the inner part. The underlying mechanism of stress corrosion cracking (SCC) susceptibility was considered.
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