Electrochemical and X-ray investigation of austenitic 304L and 316L stainless steels treated by a gliding arc in humid air

摘要: Abstract Austenitic 304L and 316L stainless steel discs are exposed to the abundant highly reactive hydroxyl radicals OH with respect NO, generated by a non-thermal gliding arc plasma in humid air. The plasma–surface interaction presumably provokes oxidation of surface induces corrosion phenomena and/or phase transformation on alloy which is electrochemically controlled using linear sweep voltammetry aqueous NaOH (0.025 M) solution looking at iron hydroxide Fe(OH) 3 reduction. Corrosion potential ( E corr ) current I ), 10 −2  M nitric acid solution, plasma-treated samples exposure time increase decrease respectively constant value after treatment threshold suggesting formation passive barrier layer. Grazing incidence X-ray diffraction analysis treated show less predominant ferrite (α-Fe), this into hydroxides or other (γ-Fe) time. application air austenitic steels found improve their resistance aggressive environments forming more resistant layers.