Bioactivity enhancement by Sr doped Zn-Ca-P coatings on biomedical magnesium alloy

Amaravathy, P.; Kumar, T. Sampath

doi:10.1016/j.jma.2019.05.014

Cited by 44 publications

(15 citation statements)

References 43 publications

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“…For instance, the change in Gibbs free energy, ΔG, of the phosphates Ca 3 (PO 4 ) 2 and Zn 3 (PO 4 ) 2 is −187.71 kJ/mol and −186.33 kJ/mol, respectively. Thus, they can simultaneously precipitate on the surface [ 156 , 177 ] or in a co-existing Zn/Ca phosphate of the CaZn 2 (PO 4 ) 2 phase [ 156 , 185 , 186 ] due to their similar crystallographic structure. Bear in mind that in order to predict the predominant composition of the formed PCC, it is necessary to consider the stability of these phases with respect to other possible phases.…”

Section: Conversion Coatingsmentioning

confidence: 99%

Chromate-Free Corrosion Protection Strategies for Magnesium Alloys—A Review: PART I—Pre-Treatment and Conversion Coating

et al. 2022

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Corrosion protection systems based on hexavalent chromium are traditionally perceived to be a panacea for many engineering metals including magnesium alloys. However, bans and strict application regulations attributed to environmental concerns and the carcinogenic nature of hexavalent chromium have driven a considerable amount of effort into developing safer and more environmentally friendly alternative techniques that provide the desired corrosion protection performance for magnesium and its alloys. Part I of this review series considers the various pre-treatment methods as the earliest step involved in the preparation of Mg surfaces for the purpose of further anti-corrosion treatments. The decisive effect of pre-treatment on the corrosion properties of both bare and coated magnesium is discussed. The second section of this review covers the fundamentals and performance of conventional and state-of-the-art conversion coating formulations including phosphate-based, rare-earth-based, vanadate, fluoride-based, and LDH. In addition, the advantages and challenges of each conversion coating formulation are discussed to accommodate the perspectives on their application and future development. Several auspicious corrosion protection performances have been reported as the outcome of extensive ongoing research dedicated to the development of conversion coatings, which can potentially replace hazardous chromium(VI)-based technologies in industries.

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Section: Conversion Coatingsmentioning

confidence: 99%

Chromate-Free Corrosion Protection Strategies for Magnesium Alloys—A Review: PART I—Pre-Treatment and Conversion Coating

et al. 2022

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“…Besides, it has to be mentioned that Ca and Sr may be other factors that promote cell proliferation, since Ca and Sr are important components during bone formation. Extensive studies have demonstrated that the introduction of Ca and Sr in the coatings greatly favors excellent cell proliferation and ALP activity of osteoblasts [34,35]. In this study, the presence of Ca and Sr possibly helped to promote cell proliferation and ALP activity.…”

Section: Cell Activity and Alp Activitymentioning

confidence: 65%

Preliminary Investigation on Degradation Behavior and Cytocompatibility of Ca-P-Sr Coated Pure Zinc

Xie

Tang

et al. 2021

Coatings

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Zinc and its alloys show a good application prospect as a new biodegradable material. However, one of the drawbacks is that Zn and its alloys would induce the release of more Zn ions, which are reported to be cytotoxic to cells. In this study, a Ca-P-Sr bioactive coating was prepared on the surface of pure zinc by the hydrothermal method to address this issue. The morphology, thickness, and composition were characterized, and the effects of the coating on the degradation, cell viability, and ALP staining were investigated. The results demonstrated that the degradation rate of pure zinc was reduced, while the cytocompatibility was significantly improved after pure zinc was treated with Ca-P-Sr coating. It is considered that the Ca-P-Sr bioactive coating prepared by the hydrothermal method has promising application in the clinic.

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“…After 3 days of immersion (see Figure 10 a), the surface looked still compact as that shown in Figure 8 b, while a classical “mud” structure developed by increasing the immersion time in HS (i.e., 7 and 14 days, see Figure 10 b,c, respectively). Cracks present on the surface of samples can be explained by taking into account (i) the residual-stress release during the hard anodizing process when the coating is immersed in HS, (ii) the HE due to the corrosion of magnesium alloy, 34 , 35 and/or (iii) the penetration of HS into anodic layer pores and the following formation of HAP with higher volume. 35 The formation of HAP is confirmed also by the Raman spectrum, as shown in Figure 10 d, related to the anodized AZ31 sample immersed for 14 days in HS.…”

Section: Resultsmentioning

confidence: 99%

Tuning of the Mg Alloy AZ31 Anodizing Process for Biodegradable Implants

Zaffora

Franco

Virtù

et al. 2021

ACS Appl. Mater. Interfaces

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Coatings were grown on the AZ31 Mg alloy by a hard anodizing process in the hot glycerol phosphate-containing electrolyte. Anodizing conditions were optimized, maximizing corrosion resistance estimated by impedance measurements carried out in Hank’s solution at 37 °C. A post anodizing annealing treatment (350 °C for 24 h) allowed us to further enhance the corrosion resistance of the coatings mainly containing magnesium phosphate according to energy-dispersive X-ray spectroscopy and Raman analyses. Gravimetric measurements revealed a hydrogen evolution rate within the limits acceptable for application of AZ31 in biomedical devices. In vitro tests demonstrated that the coatings are biocompatible with a preosteoblast cell line.

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Bioactivity enhancement by Sr doped Zn-Ca-P coatings on biomedical magnesium alloy

Cited by 44 publications

References 43 publications

Chromate-Free Corrosion Protection Strategies for Magnesium Alloys—A Review: PART I—Pre-Treatment and Conversion Coating

Chromate-Free Corrosion Protection Strategies for Magnesium Alloys—A Review: PART I—Pre-Treatment and Conversion Coating

Preliminary Investigation on Degradation Behavior and Cytocompatibility of Ca-P-Sr Coated Pure Zinc

Tuning of the Mg Alloy AZ31 Anodizing Process for Biodegradable Implants

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