Gas-phase methane contamination caused from stainless steel (SS) surface by metal–metal friction was investigated by introducing tritium as a tracer of hydrogen atom in the metal surface. The emissions of HT, CH3T, and CH4 were measured by radio-gas-chromatography, and the SS canister containing many small SS balls inside was shaken to reproduce the metal–metal friction. The results indicate that the oxide layer on SS surface is controlling the emission of methane.
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Higaki et al. (2006) studied this question.
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