Photoelectrochemical investigations on individual ferritic and austenitic grains of a duplex stainless steel oxidized in water vapour. - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Materials at High Temperatures Année : 2011

Photoelectrochemical investigations on individual ferritic and austenitic grains of a duplex stainless steel oxidized in water vapour.

Résumé

This work presents a multiscale photoelectrochemical characterization of oxide layers, and aims mainly at introducing the mesoscopic scale (ca 30 mu m). For the first time, photocurrent energy spectra could be recorded on individual ferritic and austenitic grains of a unique 2205 duplex stainless steel sample oxidized for 5 minutes at 650 degrees C under 20% water vapour in nitrogen. These results allowed us to explain contrasting issues in the photoelectrochemical images obtained from the oxidized sample. Moreover, the bandgap energies obtained by fitting these individual mesoscopic photocurrent energy spectra with a novel approach developed in our laboratory, showed that all oxide scales were constituted of Fe(2)O(3) and Cr(2)O(3) and of an Fe(2-x)Cr(x)O(3) solid solutions, but that the x-value of the latter was different depending on the metallurgic phase of the oxidized substrate. The latter results were shown to be in agreement with those of additional Raman analyses of the oxidized austenitic and ferritic grains.

Domaines

Matériaux
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Dates et versions

hal-00664735 , version 1 (31-01-2012)

Identifiants

Citer

A. Srisrual, J.P. Petit, Y. Wouters, C. Pascal, A. Galerie. Photoelectrochemical investigations on individual ferritic and austenitic grains of a duplex stainless steel oxidized in water vapour.. Materials at High Temperatures, 2011, 28 (4), pp.349-354. ⟨10.3184/096034011x13190163136192⟩. ⟨hal-00664735⟩
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