Journal
APPLIED SURFACE SCIENCE
Volume 257, Issue 11, Pages 5088-5097Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2011.01.026
Keywords
Stainless steel; AFM; Polarization; Passive film; Transpassivity
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Passive film properties of type 304L stainless steel in nitric acid medium are investigated in both ex situ and in situ conditions. Ex situ results revealed that variation in passive film morphology occurs depending upon the concentration and time of immersion. In situ surface morphological investigation showed formation of platelet like structures at lower concentrations (0.1 M, 0.5 M), and towards higher concentration (0.6 M, 1 M) the platelet like structures got agglomerated, homogenized and started depleting from the surface leading to opening up of oxide boundaries. Compositional analysis of the passive film revealed duplex nature at lower concentration consisting of hydroxide and oxide layer, and with increasing concentration oxide layer predominates over the surface. (C) 2011 Elsevier B.V. All rights reserved.
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