4.6 Article

Passive Films Formed on Fe- and Ni-Based Alloys in an Alkaline Medium: An Insight into Complementarities between Electrochemical Techniques and Near-Field Microscopies (AFM/SKPFM)

Journal

APPLIED SCIENCES-BASEL
Volume 13, Issue 21, Pages -

Publisher

MDPI
DOI: 10.3390/app132111659

Keywords

stainless steel; nickel-based alloy; cyclic voltammetry; electrochemical impedance spectroscopy; atomic force microscopy; SKPFM

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This study investigates the natural passivation process of two types of stainless steels (AISI 316 and AISI 304) and a nickel-based alloy (Inconel 600) as a function of immersion time in an alkaline medium. The growth of oxide film on each substrate is influenced by trenches formed during the polishing step and does not depend on the chemical composition. The formed film after 3 days of immersion acts as a protective barrier against alloy dissolution.
This study investigates the natural passivation process of two types of stainless steels (AISI 316 and AISI 304) and a nickel-based alloy (Inconel 600) as a function of immersion time in an alkaline medium. As shown by Atomic Force Microscopy (AFM), the oxide film growth on each substrate is only influenced by trenches formed during the polishing step and does not depend on the chemical composition. The evolution of EIS measurements is explained by this growth mode. After 3 days of immersion, the formed film constitutes a protective barrier against alloy dissolution, as shown by Scanning Kelvin Probe Microscopy (SKPFM).

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