Effect of tungsten 0–8wt.% on the oxidation of Co–Cr alloys

Karaali, A.; Mirouh, K.; Hamamda, S.; Guiraldenq, P.

doi:10.1016/j.commatsci.2004.12.025

Cited by 23 publications

(17 citation statements)

References 10 publications

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“…Heat treatment, casting, or forging also contributes some significant parts in the control of corrosion or oxidation of Co-Cr alloy. [6,7,13,14] Defects on the mechanical drawn wire have been reported to play partial detrimental effect on the stable OCP when the implant is exposed to the electrolyte. [15 -17] Crevice corrosion has been proved to be the primary problem originating from these mechanical defects.…”

Section: Discussionmentioning

confidence: 99%

Heterogeneous surface properties on wallstents

Shih

Chen

et al. 2009

Surface & Interface Analysis

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Wallstent has been successfully used to open up clogged peripheral arteries. Co-Cr alloy is the preferred metal for the construction of wallstent. Unfortunately, major complications such as in-stent intimal hyperplasia,stent obstruction, and stent stricture are often reported, and these complications could be related to the metallic properties of the wallstent. In this study, the electrochemical properties of Co-Cr wires from wallstent were investigated using cyclic polarization, open-circuit potential, potentiostatic condition, and electrochemical impedance spectroscopy. Scanning electron microscopy and X-ray mapping were also employed to investigate the surface morphology and elemental distribution after electrochemical measurement. Results of this study showed the heterogeneous electrochemical properties of Co-Cr alloy wires that could result in severe galvanic corrosion of wallstent after implantation. Severe corrosion process could cause fracture of wallstent, resulting in localized inflammation, allergy, and thicker neointima.

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Section: Discussionmentioning

confidence: 99%

Heterogeneous surface properties on wallstents

Shih

Chen

et al. 2009

Surface & Interface Analysis

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“…Here, the same treatment was applied to stainless steel used as reinforcement in the same bone cement. An extremely thin chromium oxide layer (of the order of nanometers) on stainless steel27 and Co‐Cr31 surfaces is believed to be responsible for the interaction between the metal surfaces and the silane coupling agent.…”

Section: Methodsmentioning

confidence: 99%

Adhesion enhancement of steel fibers to acrylic bone cement through a silane coupling agent

Kotha

Lieberman

Vickers

et al. 2005

J Biomedical Materials Res

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The use of a silane coupling agent (methacryloxypropyl-trichlorosilane) to improve the mechanical properties of steel fiber-reinforced acrylic bone cements was assessed. Changes to the tensile and fracture properties of bone cements reinforced with silane-coated or uncoated 316L stainless steel fibers of different aspect ratios were studied. Contact-angle measurements indicated that the coupling agent coats the metal surface through room temperature treatments in a short time (within 2 h). Push-out tests indicated that the interfacial shear strength of silane-coated 316L stainless steel rods is 141% higher than the uncoated rods. The elastic moduli, ultimate stresses, and fracture toughness of the silane-coated, steel fiber-reinforced bone cements are significantly higher than the bone cements reinforced with uncoated steel fibers. There were no differences in the tensile mechanical properties of the silane-coated or uncoated, steel fiber-reinforced cements after aging in a physiological saline solution, indicating that the bonding effectiveness is decreased by the intrusion of water at the metal-polymer interface. Because of possible biocompatibility issues with leaching of the silane coupling agent and no long-term mechanical benefit in simulated aging experiments, the use of these agents is not recommended for in vivo use.

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“…Co-Cr alloy is the usual engineering high temperature alloy, in which the active element (Cr) can form relatively stable oxide scales (Karaali et al, 2005;Hansson et al, 2007;Kofstad, 1988;He et al, 2005). It is a typical single-phase alloy to study the oxidation mechanism.…”

Section: Introductionmentioning

confidence: 99%

The oxidation of micro-crystalline Co–Cr alloys under balanced oxygen pressure of Co2O3/Co powders

Sun

et al. 2008

Journal of Materials Processing Technology

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Effect of tungsten 0–8wt.% on the oxidation of Co–Cr alloys

Cited by 23 publications

References 10 publications

Heterogeneous surface properties on wallstents

Heterogeneous surface properties on wallstents

Adhesion enhancement of steel fibers to acrylic bone cement through a silane coupling agent

The oxidation of micro-crystalline Co–Cr alloys under balanced oxygen pressure of Co2O3/Co powders

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