The effect of Ni in the electrochemical properties of oxide layers grown on stainless steels

Abreu, C.M.; Cristóbal, M.J.; Losada, Ricardo; Nóvoa, X.R.; Peña, G.; Pérez, M.C.

doi:10.1016/j.electacta.2005.08.033

Cited by 136 publications

(60 citation statements)

References 19 publications

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“…Metallic enrichments at the interfaces oxide/metals have also been reported in other alloys (aluminium alloys [17] and stainless steels [18] ). Considering this result, the aforementioned shifting of the BE of O 1s, Mg 2p 3/2 , Al 2p 3/2 signals can be better understood.…”

Section: Chemical Characterization Of Native Oxide Layers By Xpsmentioning

confidence: 92%

An XPS analysis of the oxide surface layers formed on a friction stir processed magnesium alloy

Cristóbal

Gesto

Miniño

et al. 2012

Surface & Interface Analysis

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Friction stir processing (FSP) is a promising technique for improving plasticity of magnesium alloys through the homogenization and grain refinement of their structure. In this study, a magnesium alloy AZ31 has been processed by FSP to achieve an ultrafine grain size structure (700 nm), and the oxide films formed spontaneously on the surface of the FSP zone are compared with those on the unprocessed material. Chemical composition of the oxide films are analyzed by XPS.The natural oxide films, close to 36 nm, can be described as a structure of (MgO)/Mg(OH) 2 with the outermost surface mainly formed by Mg(OH) 2 /MgCO 3 . About 5-7 at.% of Al 3+ is distributed through the oxide layer. Segregated zinc enrichment (Zn 2p 3/2 at 1021.4 eV) at the interface oxide/metal is found. The FSP samples show higher carbonatation degree at the surface and a lower segregated zinc percentage at the interface oxide/metal.

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Section: Chemical Characterization Of Native Oxide Layers By Xpsmentioning

confidence: 92%

An XPS analysis of the oxide surface layers formed on a friction stir processed magnesium alloy

Cristóbal

Gesto

Miniño

et al. 2012

Surface & Interface Analysis

Self Cite

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“…The magnetite can also be partially oxidised to ␥-FeOOH [14,23] and chemically reduced to ␥-Fe 2 O 3 [24]. Abreu et al [21,24] studied the electrochemical behaviour of AISI 304L stainless steel in a deaerated 0.1 M NaOH solution. They used a hierarchical arrangement of three stacked RC pairs.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical characterisation of a martensitic stainless steel in a neutral chloride solution

Marcelin

Pébère

Régnier

2013

Electrochimica Acta

151

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To cite this version:Sabrina Marcelin, Nadine Pébère, Sophie Régnier. Electrochemical characterisation of a martensitic stainless steel in a neutral chloride solution. Electrochimica Acta, Elsevier, 2013, vol. 87, pp. 32-40 a b s t r a c tThis paper focuses on the characterisation of the electrochemical behaviour of a martensitic stainless steel in 0.1 M NaCl + 0.04 M Na 2 SO 4 solution and is a part of a study devoted to crevice corrosion resistance of stainless steels. Polarisation curves and electrochemical impedance measurements were obtained for different experimental conditions in bulk electrolyte. X-ray photoelectron spectroscopy (XPS) was used to analyse the passive films. At the corrosion potential, the stainless steel was in the passive state and the corrosion process was controlled by the properties of the passive film formed during air exposure. During immersion in the deaerated solution, the passive film was only slightly modified, whereas it was altered both in composition and thickness during immersion in the aerated solution. After cathodic polarisation of the stainless steel electrode surface, the oxide film was almost totally removed and the surface appeared to be uniformly active for oxygen reduction. The new passive film, formed at the corrosion potential, was enriched with iron species and less protective. Impedance diagrams allowed the characterisation of both the oxide film (high-frequency range) and the charge transfer process (low-frequency range).

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“…The thickness of the passive film on stainless steel is usually 2 nm to 10 nm [4,6,21], which is larger than the space charge layer thickness of about 1 nm [22]. Thus, lower Ni [23] or Cr [24] content can reduce the photocurrent intensity through formation of thicker passive films. However, high Cr content can reduce the photocurrent because Cr 3+ ions in the passive film on Fe-20Cr act as recombination sites for electron-hole pairs [4].…”

Section: Photocurrent Responsesmentioning

confidence: 99%

Photoelectrochemical analysis of the effects of pH and sulfate ions on the structure and the composition of the passive film formed on Fe-20Cr-15Ni alloy

2009

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The effects of pH and sulfate ions on the structure and compositions of the passive film formed on Fe-20Cr-15Ni were examined using a photoelectrochemical technique and Mott-Schottky analysis. The photocurrent spectra for the passive film formed on Fe-20Cr-15Ni in the buffer solutions are composed of two spectral components, one of which is generated from Cr-substituted γ-Fe 2 O 3 and the other of which is generated from NiO. However, the passive film formed in sulfate solutions showed only the photocurrent spectrum of Cr-substituted γ-Fesuggesting that the formation of NiO in the passive film is suppressed because of a severe selective dissolution of Ni in the presence of sulfate ions. Mott-Schottky plots confirmed that the base structure of the passive film on Fe-20Cr-15Ni is n-type (Cr, Ni)-substituted γ-Fe 2 O 3 regardless of solution pH and sulfate ions. The photocurrent intensity, flat band potential, and donor density for the passive film varied depending on the solution pH or the presence of sulfate ions in the solution, due primarily to the Cr enrichment in the film caused by the preferential dissolution of Fe and Ni that is more appreciable in highly acidic solutions containing sulfate ions.

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The effect of Ni in the electrochemical properties of oxide layers grown on stainless steels

Cited by 136 publications

References 19 publications

An XPS analysis of the oxide surface layers formed on a friction stir processed magnesium alloy

An XPS analysis of the oxide surface layers formed on a friction stir processed magnesium alloy

Electrochemical characterisation of a martensitic stainless steel in a neutral chloride solution

Photoelectrochemical analysis of the effects of pH and sulfate ions on the structure and the composition of the passive film formed on Fe-20Cr-15Ni alloy

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