Abstract
A thermodynamic basis is used to explain why some metals are prone to develop a resistant passivation layer whereas some are subject to S-induced corrosion. We revisit the correlations between formation enthalpies of adsorbed (2D) and bulk (3D) compounds, both for the M–O and the M–S systems. Then we plot S adsorption enthalpy versus O adsorption enthalpy. This plot allows us to classify the various metals according to their capacity to adsorb rather O or S. Applied to corrosion science and engineering, this work should help predicting the resistance of metals and alloys to corrosion induced by environmental sulphur.
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