Computer assisted corrosion analysis of hydroxyapatite coated CoCrMo biomedical alloys

Coşkun, Mert; Karahan, İsmail Hakkı; Golden, Teresa D.

doi:10.1016/j.surfcoat.2015.05.037

Cited by 19 publications

(10 citation statements)

References 23 publications

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“…With the addition of molybdenum to these alloys, an orthopedic implant material has emerged and demonstrates a remarkable level of versatility and durability [74]. Recently, CoCrMo alloys have been sufficiently researched as an alternative to other biomedical alloys (i.e., metal-on-metal hip resurfacing joints) due to their superior strength and robust surface hardness, which increases resistant to wear in vivo [18, 75–79]. The corrosion resistance of CoCrMo alloys is due to the protective layer that spontaneously forms on the surface, inhibiting corrosion and the release of metal ions.…”

Section: Surface Activation Techniquesmentioning

confidence: 99%

“…CoCrMo alloys have been etched in combinations of different acids including HCl, HNO 3 , HF, and acetic acid [80]. Coşkun et al [18, 77, 79] used commercially provided CoCrMo dental alloy (Co-58.3%, Cr-32%, Mo-6.5%, W-1.5%, and Si-1.0%) as a substrate. After polishing, the substrates were degreased then pretreated with 1 M HCl and then 10% HF solution.…”

Section: Surface Activation Techniquesmentioning

confidence: 99%

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Surface Activation and Pretreatments for Biocompatible Metals and Alloys Used in Biomedical Applications

Huynh

Ngo

Golden

2019

International Journal of Biomaterials

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To improve the biocompatibility of medical implants, a chemical composition of bone-like material (e.g., hydroxyapatite) can be deposited on the surface of various substrates. When hydroxyapatite is deposited on surfaces of orthopedic implants, several parameters must be addressed including the need of rapid bone ingrowth, high mechanical stability, corrosion resistance, biocompatibility, and osseointegration induction. However, the deposition process can fail due to poor adhesion of the hydroxyapatite coating to the metallic substrate. Increasing adhesion by enhancing chemical bonding and minimizing biocoating degradation can be achieved through surface activation and pretreatment techniques. Surface activation can increase the adhesion of the biocoating to implants, providing protection in the biological environment and restricting the leaching of metal ions in vivo. This review covers the main surface activation and pretreatment techniques for substrates such as titanium and its alloys, stainless steel, magnesium alloys, and CoCrMo alloys. Alkaline, acidic, and anodizing techniques and their effects on bioapatite deposition are discussed for each of the substrates. Other chemical treatment and combination techniques are covered when used for certain materials. For titanium, the surface pretreatments improve the thickness of the TiO2 passive layer, improving adhesion and bonding of the hydroxyapatite coating. To reduce corrosion and wear rates on the surface of stainless steel, different surface modifications enhance the bonding between the bioapatite coatings and the substrate. The use of surface modifications also improves the morphology of hydroxyapatite coatings on magnesium surfaces and limits the concentration of magnesium ions released into the body. Surface treatment of CoCrMo alloys also decreased the concentration of harmful ions released in vivo. The literature covered in this review is for pretreated surfaces which then undergo deposition of hydroxyapatite using electrodeposition or other wet deposition techniques and mainly limited to the years 2000-2019.

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Section: Surface Activation Techniquesmentioning

confidence: 99%

Section: Surface Activation Techniquesmentioning

confidence: 99%

Surface Activation and Pretreatments for Biocompatible Metals and Alloys Used in Biomedical Applications

Huynh

Ngo

Golden

2019

International Journal of Biomaterials

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“…A smaller semicircle in the high frequency region reflected a smaller charge transfer resistance in the interface region . As shown in the inset of Figure A, an equivalent circuit model, composed of electrolyte resistance ( R s ), a constant phase element (CPE), and charge transfer resistance ( R ct ), was used to fit the semicircular arc part of the EIS with Zview software . Based on the fitting results, the charge transfer resistance for ABAC (235.6 ohm) was lower than those for raw GAC (350.6 ohm) and NABC (307.8 ohm), suggesting faster charge transfer across the interface between the solution and the ABAC particles.…”

Section: Resultsmentioning

confidence: 99%

Bubbleless Air Shapes Biofilms and Facilitates Natural Organic Matter Transformation in Biological Activated Carbon

Liu

Graham

et al. 2023

Environ. Sci. Technol.

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The biodegradation in the middle and downstream of slow-rate biological activated carbon (BAC) is limited by insufficient dissolved oxygen (DO) concentrations. In this study, a bubbleless aerated BAC (termed ABAC) process was developed by installing a hollow fiber membrane (HFM) module within a BAC filter to continuously provide aeration throughout the BAC system. The BAC filter without an HFM was termed NBAC. The laboratory-scale ABAC and NBAC systems operated continuously for 426 days using secondary sewage effluent as an influent. The DO concentrations for NBAC and ABAC were 0.78 ± 0.27 and 4.31 ± 0.44 mg/L, respectively, with the latter providing the ABAC with greater electron acceptors for biodegradation and a microbial community with better biodegradation and metabolism capacity. The biofilms in ABAC secreted 47.3% less EPS and exhibited greater electron transfer capacity than those in NBAC, resulting in enhanced contaminant degradation efficiency and long-term stability. The extra organic matter removed by ABAC included refractory substances with a low elemental ratio of oxygen to carbon (O/C) and a high elemental ratio of hydrogen to carbon (H/C). The proposed ABAC filter provides a valuable, practical example of how to modify the BAC technology to shape the microbial community, and its activity, by optimizing the ambient atmosphere.

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“…Electrodeposition is a coating method with many practical advantages, such as ability to coat complex geometries, low operation temperature, and control of coating composition [14]. Electrodeposition method has been widely used for fabrication of Co-Ni coatings due to * corresponding author; e-mail: rsmozdemir@gmail.com anomalous codeposition behavior of these elements [15].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Structural and Magnetic Properties of the Cobalt-Nickel Alloys Fabricated in Various Electrolyte Solutions

2017

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Cobalt-Nickel alloys have been widely used for decoration, in magnetic recording devices and corrosion resistance applications, etc. In this study, the influences of cobalt amount in electrolyte on the magnetic and structural properties of the electrodeposited Co-Ni alloys were investigated. An electrolyte solution, consisting of cobalt sulfate, nickel sulfate, nickel chloride and boric acid, was used in electrodeposition. The electrochemical investigation of Co-Ni alloys was completed using cyclic voltammetry and galvanostatic studies. The morphological and structural analyses of the alloys were performed using inductively coupled plasma, scanning electron microscopy, X-ray diffraction and vibrating sample magnetometer techniques. The effect of cobalt concentration on the magnetic properties, phase structure and grain size of the alloys was investigated. Magnetic hysteresis results indicate that the amount of the cobalt content in the electrolyte has a strong influence on the ferromagnetic behavior of fabricated alloys. Results of the study show that changing the electrodeposition parameters, such as composition of electrolyte solution, allows to fabricate alloys with different properties.

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Computer assisted corrosion analysis of hydroxyapatite coated CoCrMo biomedical alloys

Cited by 19 publications

References 23 publications

Surface Activation and Pretreatments for Biocompatible Metals and Alloys Used in Biomedical Applications

Surface Activation and Pretreatments for Biocompatible Metals and Alloys Used in Biomedical Applications

Bubbleless Air Shapes Biofilms and Facilitates Natural Organic Matter Transformation in Biological Activated Carbon

Investigation of the Structural and Magnetic Properties of the Cobalt-Nickel Alloys Fabricated in Various Electrolyte Solutions

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