Abstract
The influences of discharge current density and oxidation process duration on surface morphology, crystalline phase composition, and electrochemical corrosion performance of pulsed plasma-oxidized AISI 316L stainless steel were studied. Analysis of results shows that samples treated through DC pulsed plasma oxidation (0.5 mA/cm2, 60 min) exhibit corrosion current values of 2.0 × 10−4 mA/cm2 which represent one eighth of the corrosion current obtained for untreated samples and one half that of chemically passivated samples. Scanning electron microscopy, grazing incidence x-ray diffraction, and Raman analysis show that the improved corrosion performance of oxidized samples could be attributed to morphological changes of the oxidized layer which is composed of hematite and magnetite iron oxides. Corrosion performances of DC plasma-oxidized samples suggest that through this technique, it is possible to obtain comparable or even better corrosion performance than techniques, such as inductively coupled plasma-oxidizing process, but without the inherent higher instrumental requirements of radiofrequency plasma processes.
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Díaz-Guillén, J.C., Vargas-Gutiérrez, G., Granda-Gutiérrez, E.E. et al. Influences of Processing Time and Discharge Current Density During Pulsed Plasma-Oxidizing process of AISI 316L. J. of Materi Eng and Perform 24, 2368–2372 (2015). https://doi.org/10.1007/s11665-015-1531-0
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DOI: https://doi.org/10.1007/s11665-015-1531-0