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  • 1.
    Ma, Li
    et al.
    PSL Res Univ, CNRS, Chim ParisTech, IRCP,Phys Chem Surfaces Grp, 11 Rue Pierre & Marie Curie, F-75005 Paris, France..
    Paschalidou, Eirini-Maria
    PSL Res Univ, CNRS, Chim ParisTech, IRCP,Phys Chem Surfaces Grp, 11 Rue Pierre & Marie Curie, F-75005 Paris, France.
    Wiame, Frederic
    PSL Res Univ, CNRS, Chim ParisTech, IRCP,Phys Chem Surfaces Grp, 11 Rue Pierre & Marie Curie, F-75005 Paris, France..
    Zanna, Sandrine
    PSL Res Univ, CNRS, Chim ParisTech, IRCP,Phys Chem Surfaces Grp, 11 Rue Pierre & Marie Curie, F-75005 Paris, France..
    Maurice, Vincent
    PSL Res Univ, CNRS, Chim ParisTech, IRCP,Phys Chem Surfaces Grp, 11 Rue Pierre & Marie Curie, F-75005 Paris, France..
    Marcus, Philippe
    PSL Res Univ, CNRS, Chim ParisTech, IRCP,Phys Chem Surfaces Grp, 11 Rue Pierre & Marie Curie, F-75005 Paris, France..
    Passivation mechanisms and pre-oxidation effects on model surfaces of FeCrNi austenitic stainless steel2020Inngår i: Corrosion Science, ISSN 0010-938X, E-ISSN 1879-0496, Vol. 167, artikkel-id 108483Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Passivation mechanisms were investigated on (100)-oriented Fe-18Cr-13Ni surfaces with direct transfer between surface preparation and analysis by X-ray photoelectron spectroscopy and scanning tunneling microscopy and electrochemical characterization. Starting from oxide-free surfaces, pre-oxidation at saturation under ultra-low pressure (ULP) oxygen markedly promotes the oxide film Cr(III) enrichment and hinders/delays subsequent iron oxidation in water-containing environment. Exposure to sulfuric acid at open circuit potential causes preferential dissolution of oxidized iron species. Anodic passivation forces oxide film re-growth, Cr(III) dehydroxylation and further enrichment. ULP pre-oxidation promotes Cr(III) hydroxide formation at open circuit potential, compactness of the nanogranular oxide film and corrosion protection.

  • 2.
    von Fieant, Kristina
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för kemi - Ångström, Oorganisk kemi.
    Paschalidou, Eirini-Maria
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för kemi - Ångström, Oorganisk kemi.
    Srinath, Aishwarya
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för kemi - Ångström, Oorganisk kemi.
    Soucek, Pavel
    Masaryk Univ, Dept Phys Elect, Brno, Czech Republic.
    Riekehr, Lars
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för kemi - Ångström, Oorganisk kemi.
    Nyholm, Leif
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för kemi - Ångström, Oorganisk kemi.
    Lewin, Erik
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för kemi - Ångström, Oorganisk kemi.
    Multi-component (Al,Cr,Nb,Y,Zr)N thin films by reactive magnetron sputter deposition for increased hardness and corrosion resistance2020Inngår i: Thin Solid Films, ISSN 0040-6090, E-ISSN 1879-2731, Vol. 693, artikkel-id 137685Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Multi-component nitride thin films in the Al-Cr-Nb-Y-Zr system with non-equimolar composition have been deposited by reactive dc magnetron sputtering. The substrate temperature and substrate bias have been varied, from room temperature to 700 degrees C and from 0 to -200 V respectively. The relationship between these varied growth conditions on the structure, morphology, mechanical and corrosion properties of the films have been probed. All films consisted of a single solid solution with a NaCl-type structure, as shown by X-ray diffraction. However, elemental energy dispersive spectroscopy maps, obtained in the scanning transmission electron microscope, indicated that there could be partial segregation of Al, Cr and Y atoms within the grains. The microstructure of the films became denser, more fine-grained and smoother as the bias and temperature were increased. Nanoindentation showed that the hardness of the films increased with both bias and temperature, reaching a maximum of 27 +/- 2 GPa. The corrosion resistance of the films, studied by performing potentiodynamic polarisation curves in 1 M HCl, was also found to be improved when compared to a commercially available hyper-duplex stainless steel and a ternary reference (Nb,Zr)N thin film as well.

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