Tehnički vjesnik, Vol. 22 No. 1, 2015.
Izvorni znanstveni članak
https://doi.org/10.17559/TV-20140211130812
SEM/EDX, XPS, corrosion and surface roughness characterization of AISI 316L SS after electrochemical treatment in concentrated HNO3
Krzysztof Rokosz
; Division of Surface Electrochemistry and Technology, Koszalin University of Technology, Racławicka 15-17, 75-620 Koszalin, Poland
Tadeusz Hryniewicz
; Division of Surface Electrochemistry and Technology, Koszalin University of Technology, Racławicka 15-17, 75-620 Koszalin, Poland
Steinar Raaen
; Physics Department NTNU, NO-7491 Trondheim, Norway
Jan Valiček
; Institute of Physics, Faculty of Mining and Geology, VŠB - Technical University of Ostrava, 17. listopadu 15/2172, 708 33 Ostrava-Poruba, Czech Republic
Sažetak
In the paper there is described the AISI 316L stainless steel surface obtained after electrochemical treatment in concentrated HNO3. It was characterized by roughness parameters, corrosion protection behaviour and chemical composition of the surface layer. Generally used 2D and 3D roughness parameters describing the surface after the electrochemical treatment are the following: Ra = 0.737 μm and Sa = 1,13 μm as well as Rq = 0,895 μm and Sq = 1,37 μm. In case of corrosion studies the passive current density was equal to 2,3×10 ̶ 2 μA/cm2, pitting potential was equal to Epit = 1140 mV vs. SCE and re-passivation potential was 79 mV vs. SCE. In the surface layer there were detected compounds of iron, chromium, molybdenum, cobalt, manganese, as well as calcium (contamination). The high resolution XPS spectra/results data have shown that most of detected iron compounds can be described as Fe2O3/FeOOH and chromium compounds as Cr2O3/CrOOH. The molybdenum detected in the surface layer was mainly in valency states six (65 at%) and five (17 at%).
Ključne riječi
AISI 316L SS; corrosion characteristics; electrochemical treatment; HNO3; surface roughness; XPS
Hrčak ID:
135073
URI
Datum izdavanja:
23.2.2015.
Posjeta: 3.911 *