Electrochemical behavior of cold sprayed hydroxyapatite/titanium composite in Hanks’ solution

Zhou, Xingyu; Mohanty, Prasanna

doi:10.1016/j.electacta.2012.01.018

Cited by 85 publications

(51 citation statements)

References 37 publications

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“…Examples include CS of hydroxyapatite (HA) for biomedical applications -pure HA [212,213], HA mixed with titanium [214] or doped with silver [215] -and titania as photoelectrodes [216][217][218][219][220]. In most cases, the thickness of the deposited material is limited to a monolayer of particles.…”

Section: Ceramics and Compositesmentioning

confidence: 99%

Cold spraying – A materials perspective

et al. 2016

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Cold spraying is a solid-state powder deposition process with several unique characteristics, allowing production of coatings or bulk components from a wide range of materials. The process has attracted much attention from academia and industry over the past two decades.The technical interest in cold spraying is twofold: first as a coating process for applications in surface technology, and second as a solid-state additive manufacturing process, offering an alternative to selective laser melting or electron beam melting methods. Moreover, cold spraying can be used to study materials behaviour under extremely high strain rates, high pressures and high cooling rates. The cold spraying process is thus considered to be relevant for various industrial applications, as well as for fundamental studies in materials science.This article aims to provide an overview of the cold spray process, the current understanding of the deposition mechanisms, and the related models and experiments, from a materials science perspective. IntroductionCold spraying (CS) is a solid-state material deposition technique, where micron-sized particles of a powder bond to a substrate as a result of high-velocity impact and the associated severe plastic deformation. Acceleration of particles to high velocities is obtained via expansion of a pressurised and (ironically) 'hot' gas through a diverging-converging nozzle.Despite heating the process gas -which is to provide higher acceleration of the gas and also to facilitate particle deformation through thermal softening -the feedstock remains in the solid state throughout the entire process; hence the name 'cold' spraying. This is to underline the contrast to conventional thermal spraying where particles are completely or partially molten upon impact onto the substrate. Alternative terminology includes cold gas spray, micro cold spray, cold gas dynamic spray, kinetic spray, supersonic particle deposition and metal powder application (MPA), all of which refer to the same principle of solid-state powder deposition as described above. CS is used for coating and repair. It is also used for additive manufacturing (AM) at relatively high deposition rates as compared to the methods based on selective laser or electron beam melting. The main advantage of CS is that it alleviates the problems associated with high temperature processing of materials, such as oxidation and unfavourable structural changes. It is possibly the only continuous method to produce bulk components of metastable materials that are available only in the powder form, e.g. as obtained from mechanical attrition or gas atomisation. The aim of the present paper is to provide an overview of CS from a materials perspective, particularly for a broader audience in materials research, e.g. with interest in dynamic phenomena, plasticity and phase transformations. In terms of application and properties, CS is perhaps best to be compared to thermal spraying processes, as in [24,25]. In view of relevant physical phenomena, however, CS is mos...

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Section: Ceramics and Compositesmentioning

confidence: 99%

Cold spraying – A materials perspective

et al. 2016

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“…The employed scan rate for the entire test has been 5 mV/s. Previous studies of coated and uncoated TiAlV alloys used scan rates from ~0.1 to 10 mV/s to evaluate the corrosion behavior of this system 12,13,18,19 , and in many studies high anodic potentials were employed. For all systems, the results are given based on the geometric area, but it is important to mention that the real area can be much higher since as-sprayed samples were used without surface polishing, and therefore, with a relatively high surface roughness.…”

Section: Methodsmentioning

confidence: 99%

“…Almost one hundred of works has been published dealing with the electrochemical, corrosion and/or mechanical properties of HA-based coatings applied on different substrates and produced by means of different techniques. The electrochemical characterization was largely done by open circuit potential (E OCP ) measurements and potentiodynamic polarization: lineal, Tafel and cyclic polarization 1,7,[13][14][15][16][17][18][19][20][21][22][23][24][25] . Tafel and cyclic polarization are good techniques for many studies but have the drawbacks to be destructive techniques due to the high potential polarization imposed which can damage the sample.…”

Section: Introductionmentioning

confidence: 99%

Corrosion Resistance Evaluation of HVOF Produced Hydroxyapatite and TiO2-hydroxyapatite Coatings in Hanks' Solution

et al. 2018

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The electrochemical behavior of HVOF produced hydroxyapatite (HA) and 80HA-20TiO 2 coatings were investigated using electrochemical techniques in natural aerated Hanks' solution in the presence and absence of bovine serum albumin (BSA) for 30 days. All samples presented open circuit potential oscillations, which were associated to the porous nature of the coating that allows the electrolyte reaches the substrate causing activation -passivation at the bottom of the pores. The polarization studies indicated that the 80HA-20TiO 2 coating was the only one that showed a narrow potential passive region from around -0.4 V to 0 V in the presence and absence of BSA, indicating the beneficial influence of the addition of TiO 2 to the HA coating stability. Our results indicated that BSA in Hanks' solution diminishes the stability of the metallic oxide layer present on the Ti-based alloy accelerating the degrading of hydroxyapatites coatings / substrate interface due to its chelating ability.

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“…An alternative to improve the performance of these coatings is the use of heat treatment as previously reported 63,66,75,78,81,84,93,96,97 . , stainless steel coatings 60,100 and Inconel 718 101 .…”

Section: Some Relevant Corrosion Studies Of Cold Spray Coatings and Cmentioning

confidence: 99%

Cold gas spray coatings: basic principles corrosion protection and applications

et al. 2017

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ABSTRACT:In this review, the beginnings and evolution of the cold gas spray (CGS) technique are described, followed by the main fundamental aspects of the technique together with a description of the several spraying systems up to date. Sequentially, the main spray parameters and their influence on the properties of the coatings are reported. Afterwards, the most important methodologies for preparing the feedstock powders to be sprayed, the effect of the powder composition, microstructure, particle size and shape on the properties of the coatings are discussed. The nature of the spray gun and nozzle, and the substrate pre-treatments were also discussed. With regard to microstructure and properties, the chemical and physical characterization of the coatings and the performance in protecting the substrates against corrosion together with some mechanical properties are presented and compared. The lacking systematic studies about the great part of investigated systems is the main drawback to compare the published results. Closing this review, the main applications, and the potentialities of the CGS coatings are evidenced.

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Electrochemical behavior of cold sprayed hydroxyapatite/titanium composite in Hanks’ solution

Cited by 85 publications

References 37 publications

Cold spraying – A materials perspective

Cold spraying – A materials perspective

Corrosion Resistance Evaluation of HVOF Produced Hydroxyapatite and TiO2-hydroxyapatite Coatings in Hanks' Solution

Cold gas spray coatings: basic principles corrosion protection and applications

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