Morphological and compositional analysis of passive film on austenitic stainless steel in nitric acid medium

▶ Passive film stability of 304L SS decreases with increase in nitric acid strength. ▶ In situ passive film study of 304L SS showed growth of platelet like structures. ▶ Passive film composition varies depending upon nitric acid concentration. Passive film properties of type 304L stainless steel in...

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Bibliographic Details
Published in:Applied surface science 2011-03, Vol.257 (11), p.5088-5097
Main Authors: Padhy, N., Paul, Ranita, Kamachi Mudali, U., Raj, Baldev
Format: Article
Language:English
Subjects:
AFM
Agglomeration
Austenitic stainless steels
Boundaries
Concentration (composition)
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Condensed matter: structure, mechanical and thermal properties
Cross-disciplinary physics: materials science
rheology
Depletion
Exact sciences and technology
Nitric acid
Oxides
Passive film
Physics
Platelets
Polarization
Stability
Stainless steel
Transpassivity
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Summary:▶ Passive film stability of 304L SS decreases with increase in nitric acid strength. ▶ In situ passive film study of 304L SS showed growth of platelet like structures. ▶ Passive film composition varies depending upon nitric acid concentration. 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.
ISSN:0169-4332
1873-5584
DOI:10.1016/j.apsusc.2011.01.026