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Purpose

This study aims to investigate the impact of hydrogen on the oxidation process in air and solution on duplex stainless steel.

Design/methodology/approach

The magnetic force microscopy and ToF-SIMS techniques were used to determine the different phases, oxide-film thickness and changes of oxide-film composition.

Findings

The electrochemical passivation film in the solution was driven by the potential, resulting in the phases forming a thicker film with a double-layer than that of the air; hydrogen charging causes a reduction in the oxide composition of Cr in the oxide film of both two phases, leading to a thickness of less 2 nm film presenting a non-bilayer structure. Before and after hydrogen charging, the effect of hydrogen on the growth of the oxide-film in the solution is higher than that in the air; nevertheless, the oxide-film in the solution after hydrogen charging is still dominated by Cr oxides.

Originality/value

This study provides data to help design hydrogen-corrosion-resistant stainless steel for real-world atmospheric conditions.

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