Local electrochemical studies after heat treatment of stainless steel: Role of induced metallurgical and surface modifications on pitting triggering |
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Authors: | H Krawiec V Vignal O Heintz R Oltra E Finot J M Olive |
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Affiliation: | (1) the Department of Foundry, AGH University of Science and Technology, 30-059 Kracow, Poland;(2) the LRSS-Université de Bourgogne, 21078 Dijon, Cedex, France;(3) LPUB-Université de Bourgogne, France;(4) LMP-Université Bourdeaux I, 33405 Talence, Cedex, France |
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Abstract: | The morphology, the chemical composition, and the pitting corrosion resistance of a resulfurized stainless steel heated at
1000 °C for 2 hours were investigated at the microscale using ex-situ (field-emission-scanning electron microscope/electron dispersion spectrometer (FE-SEM/EDS) and secondary ion mass spectroscopy
(SIMS)) and in-situ (electrochemical microcell technique and in-situ atomic force microscope (AFM) techniques. Although microcracks, which may have a deleterious effect, exist, the formation
of a compound (Cr,Mn)2(O,S)3 instead of MnS is responsible for the better pitting corrosion resistance of sites containing an inclusion. Local electrochemical
measurements indicate that no pitting was detected on these sites below 800 mV/SCE (saturated calomel electrode), whereas
stable pitting was observed at around 350 mV/SCE before heating. Micropores were detected on the highly oxidized grains in
which the ionic activity was found to be more marked than on the remaining surface (determined using in-situ AFM). Local electrochemical measurements revealed that the presence of such defects reduces significantly the corrosion resistance
of the metallic alloy in NaCl-based media. |
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