Abstract
In the present study we performed anodization of stainless steel AISI 316L varying the voltage, time and H2O concentration in the electrolyte obtaining self-ordered porous oxides. Open-circuit potential measurements, potentiodynamic polarization and electrochemical impedance spectroscopy were performed in 0.1 M H2SO4, 0.1 M NaCl and 0.1 M NaOH electrolytes. The metallic substrate underneath the grown oxide was also characterized. The results indicate that the corrosion behavior of the metallic substrate is not impaired by the anodization treatments. However, “crevice-induced intergranular corrosion” between the oxide and the metallic substrate was revealed after electrochemical measurements in the acidic electrolyte.
Highlights
Over the last decades, metal anodization for growing nanostructured oxide layers has attracted considerable interest, as it allows the growth of porous structured oxides presenting a wide range of morphologies
The first nanostructures on stainless steel AISI 316L were demonstrated by Vignal et al.,[5] who performed electropolishing using an organic electrolyte with perchloric acid to obtain a dimplelike structure on the substrate surface
It was proposed that these morphologies were created by convective cells in the viscous shell formed in the substrate surface during the electropolishing process
Summary
Metal anodization for growing nanostructured oxide layers has attracted considerable interest, as it allows the growth of porous structured oxides presenting a wide range of morphologies. The anodic oxide layers contain fluorine, which could be harmful for the resulting corrosion behavior, as halides can lessen passivity by the onset of pitting corrosion at lower voltages.[38] potentiodynamic polarization in 0.1 M H2SO4 solution shows that all samples suffer transpassive dissolution in the same potential range as the bare stainless steel (independent of the amount of fluorine detected on the surface, see Table III).
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