The Effect of Hydroxyapatite Coatings on the Passivation Behavior of Oxidized and Unoxidized Superelastic Nitinol Alloys

Etminanfar, Mohamadreza; Khalil‐Allafi, Jafar; Sheykholeslami, Seyed Omid Reza

doi:10.1007/s11665-018-3200-6

Cited by 21 publications

(5 citation statements)

References 42 publications

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“…There is a clear need for critical research by experienced coating technologists in this area. Here, only the effect of applied pre-treatment on the final properties of HAp-coated substrates will be addressed and the influence of these treatments on the characteristics of the bare substrates is ignored [10,[182][183][184][185].…”

Section: Pre-treatmentmentioning

confidence: 99%

“…The combination of etching and alkali pre-treatments results in a superior interfacial strength due to the increased value of the surface roughness [151,163,183,186,187]. On the other hand, the etching process may have an adverse influence on the corrosion behavior of the HAp coatings, where a slight increase in corrosion current (J corr ) of the HAp coating precipitated on the etched substrates has been addressed in comparison with those deposited on abraded substrates [184].…”

Section: Pre-treatmentmentioning

confidence: 99%

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Electrodeposited Hydroxyapatite-Based Biocoatings: Recent Progress and Future Challenges

et al. 2021

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Hydroxyapatite has become an important coating material for bioimplants, following the introduction of synthetic HAp in the 1950s. The HAp coatings require controlled surface roughness/porosity, adequate corrosion resistance and need to show favorable tribological behavior. The deposition rate must be sufficiently fast and the coating technique needs to be applied at different scales on substrates having a diverse structure, composition, size, and shape. A detailed overview of dry and wet coating methods is given. The benefits of electrodeposition include controlled thickness and morphology, ability to coat a wide range of component size/shape and ease of industrial processing. Pulsed current and potential techniques have provided denser and more uniform coatings on different metallic materials/implants. The mechanism of HAp electrodeposition is considered and the effect of operational variables on deposit properties is highlighted. The most recent progress in the field is critically reviewed. Developments in mineral substituted and included particle, composite HAp coatings, including those reinforced by metallic, ceramic and polymeric particles; carbon nanotubes, modified graphenes, chitosan, and heparin, are considered in detail. Technical challenges which deserve further research are identified and a forward look in the field of the electrodeposited HAp coatings is taken.

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Section: Pre-treatmentmentioning

confidence: 99%

Section: Pre-treatmentmentioning

confidence: 99%

Electrodeposited Hydroxyapatite-Based Biocoatings: Recent Progress and Future Challenges

et al. 2021

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“…According to a definition presented by American National Institute of Health, a biomaterial is “a synthetic or natural material or combination of the materials excluding drugs, which is deployed to partially or entirely replace any tissue/organ or maintain or enhance the life quality of the individuals.” This definition excludes gypsum, waxes, finishing materials, etc. , The biomaterials should encourage favorable biological responses in the host tissue . Depending on the type of constituent material, biomaterials can be broadly categorized as follows: (i) metallic, e.g., Ti and Ti-based alloys, Mg alloys, Co–Cr, stainless steel, NiTi; (ii) ceramic, e.g., calcium phosphates (CaP); (iii) polymer, e.g., polyurethane (PU); (iv) composite, e.g., CaP-PU; and (v) natural, e.g., skin. − It is important to appreciate the contributions made by biomaterials to modern medicine. They are used in a variety of clinical applications, including orthopedic, cardiovascular, facial, and dentistry treatments.…”

Section: Introductionmentioning

confidence: 99%

Progress in Niobium Oxide-Containing Coatings for Biomedical Applications: A Critical Review

et al. 2022

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Typically, pure niobium oxide coatings are deposited on metallic substrates, such as commercially pure Ti, Ti6Al4 V alloys, stainless steels, niobium, TiNb alloy, and Mg alloys using techniques such as sputter deposition, sol–gel deposition, anodizing, and wet plasma electrolytic oxidation. The relative advantages and limitations of these coating techniques are considered, with particular emphasis on biomedical applications. The properties of a wide range of pure and modified niobium oxide coatings are illustrated, including their thickness, morphology, microstructure, elemental composition, phase composition, surface roughness and hardness. The corrosion resistance, tribological characteristics and cell viability/proliferation of the coatings are illustrated using data from electrochemical, wear resistance and biological cell culture measurements. Critical R&D needs for the development of improved future niobium oxide coatings, in the laboratory and in practice, are highlighted.

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“…According to the anodic polarization curve of the Fe-Al-Cr coating shown in Figure 12a, when the potential is increased to −0.368 V, the Fe-Al-Cr coating is in the anodic dissolution region, leading to the obvious increase of current density with the increase of potential [28]. However, when the potential reaches −0.201 V, the current density is almost constant when the potential is increased, indicating that the Fe-Al-Cr coating is in the passivation stage [29]. Therefore, a passive layer is formed on the surface of the Fe-Al-Cr coating.…”

Section: Microhardness Testmentioning

confidence: 97%

Double Glow Plasma Surface Metallurgy Technology Fabricated Fe-Al-Cr Coatings with Excellent Corrosion Resistance

et al. 2020

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Double glow plasma surface metallurgy (DGPSM) technology was applied to obtain a Fe-Al-Cr coating on the surface of Q235 carbon steel. The influence of the sample temperature, gas pressure, the distance between the substrate, and the source electrode on the quality of the obtained Fe-Al-Cr coatings was systematically investigated. The results showed that the parameters for DGPSM have a significant effect on the uniformity, particle size, compactness, and thickness of the coating. Under the optimized parameters (sample temperature: 800 °C, gas pressure: 35 Pa, and electrode distance: 15 mm), the obtained Fe-Al-Cr coating contains Fe2AlCr, Fe3Al(Cr), FeAl(Cr), Fe(Cr) solid solution, Cr23C6, and α-Fe(Al), exhibiting excellent corrosion resistance in a 0.5 mol/L H2SO4 solution, which is even better than that of the 304 stainless steel.

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The Effect of Hydroxyapatite Coatings on the Passivation Behavior of Oxidized and Unoxidized Superelastic Nitinol Alloys

Cited by 21 publications

References 42 publications

Electrodeposited Hydroxyapatite-Based Biocoatings: Recent Progress and Future Challenges

Electrodeposited Hydroxyapatite-Based Biocoatings: Recent Progress and Future Challenges

Progress in Niobium Oxide-Containing Coatings for Biomedical Applications: A Critical Review

Double Glow Plasma Surface Metallurgy Technology Fabricated Fe-Al-Cr Coatings with Excellent Corrosion Resistance

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