ESCA investigation of the oxide layers on some Cr containing alloys

Storp, S.; Holm, Ragnar

doi:10.1016/0039-6028(77)90185-6

Cited by 52 publications

(12 citation statements)

References 9 publications

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“…HCl etching during silane formation has been reported on other metal oxides such as aluminum and titanium [74,75]. The corrosion of Co-Cr alloys in acid solution has been reported to proceed via selective dissolution of Co from the alloy [76]. Several studies in the literature have reported the dissolution of Co from Co-Cr alloy in alkaline [77], acid [76], simulated body fluid [78], and cell culture solutions [78].…”

Section: Formation and Characterization Of Ots Sam On Co-cr Alloymentioning

confidence: 98%

“…The corrosion of Co-Cr alloys in acid solution has been reported to proceed via selective dissolution of Co from the alloy [76]. Several studies in the literature have reported the dissolution of Co from Co-Cr alloy in alkaline [77], acid [76], simulated body fluid [78], and cell culture solutions [78]. However, after the dissolution of Co, these alloys spontaneously form an oxide layer which mainly consists of chromium oxides (and smaller amount of molybdenum oxides in case of Co-Cr-Mo alloys) [61,62,78].…”

Section: Formation and Characterization Of Ots Sam On Co-cr Alloymentioning

confidence: 99%

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Surface modification of cobalt–chromium–tungsten–nickel alloy using octadecyltrichlorosilanes

Mani

Feldman

et al. 2009

Applied Surface Science

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Section: Formation and Characterization Of Ots Sam On Co-cr Alloymentioning

confidence: 98%

Section: Formation and Characterization Of Ots Sam On Co-cr Alloymentioning

confidence: 99%

Surface modification of cobalt–chromium–tungsten–nickel alloy using octadecyltrichlorosilanes

Mani

Feldman

et al. 2009

Applied Surface Science

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“…The corrosion was found to proceed by selective dissolution of the Co in neutral or acidic solutions. 6) During immersion of Co-Cr-Mo alloys in Hanks solution, culture medium and cell culture, Co dissolves from the lm, and the lm composition changes to mostly comprise chromium oxide with a small amount of molybdenum oxide with formation of calcium phosphate on or in the lm. 5) After the alloy is anodically polarized in Hanks solution in a passive range, the surface oxide lm consists predominantly of Cr 2 O 3 and Cr(OH) 3 with a thickness of 3.1 nm.…”

Section: Introductionmentioning

confidence: 99%

Surface Composition and Corrosion Resistance of Co-Cr Alloys Containing High Chromium

et al. 2016

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Air-formed surface oxide lms on four types of Co-Cr-alloys were characterized using X-ray photoelectron spectroscopy (XPS) and ve types of Co-Cr alloys were anodically polarized, to identify the effects of the addition of N, Mo, and W to Co-Cr alloys containing high Cr on the surface composition and corrosion resistance. Co-20Cr-15W-10Ni (ASTM F90), Co-30Cr-6Mo, Co-33Cr-5Mo-0.3N, and Co-33Cr-9W-0.3N were employed for XPS and the above four alloys and another Co-30Cr-6Mo (ASTM F75) were employed for anodic polarization. . Cr and Mo are enriched and Co and Ni are depleted in the surface oxide lm. W was enriched in the case of Co-20Cr-15W-10Ni but depleted in the case of Co-33Cr-9W-0.3N. On the other hand, Cr, Mo, W and Ni were enriched and Co was depleted in the substrate alloy just under the surface oxide lm in the polished alloy. During rapid formation of the surface oxide lm, Cr was preferentially oxidized and the oxidation of Co and Ni delayed, according to the oxidation and reduction potentials of these elements. The Co-Cr alloys essentially have high localized corrosion resistance that is not easily affected by a small change of composition. Co-33Cr-5Mo-0.3N shows higher corrosion resistance compare than conventional Co-Cr alloys.

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“…On the contrary, cobalt was considerably depleted, and chromium was enriched after immersion in Hanks' solution. Therefore, it can be said that the preferential dissolution of cobalt occurred 19) during immersion in solution and that chromium was concentrated in the surface oxide film. This dissolution was enhanced by the outward migration of cobalt in the surface oxide film.…”

Section: Composition Of Surface Oxidementioning

confidence: 99%

Surface Characterization and Anodic Polarization of Nitrogen-Ion-Implanted Nickel-Free Co–Cr–Mo Alloy

Hiromoto

Kano

Suzuki³

et al. 2005

Mater. Trans.

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Nitrogen ions were implanted in a nickel-free Co-Cr-Mo alloy in amounts of 10 19 , 10 20 , and 10 21 ions m À2 with an acceleration energy of 150 keV and ion-beam current-density of 10 À15 mA m À2 to improve the friction-wear properties. Changes in the composition of the surface layer of the alloy with ion implantation, autoclaving, and immersion in Hanks' solution as a simulated body fluid were characterized using X-ray photoelectron spectroscopy to evaluate the stability of the material and predict the safety and tissue compatibility of the material. The surface oxide layer on the mechanically polished Co-Cr-Mo alloy consisted of oxidic species of cobalt, chromium, and molybdenum, and its thickness was about 2.5 nm. The surface film contained a large amount of OH À , that is, the oxide was hydrated or oxyhydroxidized. After N 2þ implantation, nitrogen atoms existed as cobalt nitride in the substrate just under the surface oxide and NH 3 or NH 4 in the surface oxide, and these amounts increased with the increase of the dose. Chromium was concentrated in the surface oxide but depleted in the substrate with ion implantation. Cobalt was preferentially oxidized by autoclaving and depleted in the substrate after autoclaving. Calcium phosphate was formed, and cobalt was preferentially dissolved during immersion in Hanks' solution. N 2þ -implanted Co-Cr-Mo alloy with an amount of 10 20 ions m À2showed the highest corrosion resistance.

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ESCA investigation of the oxide layers on some Cr containing alloys

Cited by 52 publications

References 9 publications

Surface modification of cobalt–chromium–tungsten–nickel alloy using octadecyltrichlorosilanes

Surface modification of cobalt–chromium–tungsten–nickel alloy using octadecyltrichlorosilanes

Surface Composition and Corrosion Resistance of Co-Cr Alloys Containing High Chromium

Surface Characterization and Anodic Polarization of Nitrogen-Ion-Implanted Nickel-Free Co–Cr–Mo Alloy

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ESCA investigation of the oxide layers on some Cr containing alloys

Cited by 52 publications

References 9 publications

Surface modification of cobalt–chromium–tungsten–nickel alloy using octadecyltrichlorosilanes

Surface modification of cobalt–chromium–tungsten–nickel alloy using octadecyltrichlorosilanes

Surface Composition and Corrosion Resistance of Co-Cr Alloys Containing High Chromium

Surface Characterization and Anodic Polarization of Nitrogen-Ion-Implanted Nickel-Free Co&ndash;Cr&ndash;Mo Alloy

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Surface Characterization and Anodic Polarization of Nitrogen-Ion-Implanted Nickel-Free Co–Cr–Mo Alloy