Abstract
To investigate the fate of nuclear waste in geologic repositories, corrosion experiments were performed on a ferrito‐pearlitic (P285–NH) and a ferritic steel (Armco) in a synthetic solution representing the Callovo-Oxfordian porewater for 3-months at 120 °C. Corrosion product layers (CPL) were characterized from micro to nanoscale. Local corrosion areas of higher thicknesses were composed of siderite layers with different nano-morphologies, iron silicate, iron sulphate and magnetite. Their formation could be due to local pH variation, but also on metal microstructure (phases location and morphology). Differences in corrosion progress are suggested to be mainly related to differences in porewater chemistry and cathodic sites.
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