An insight into the effect of buffer layer on the electrochemical performance of MgF2 coated magnesium alloy ZK60

Riaz, Usman; Rahman, Zia ur; Asgar, Hassnain; Shah, Umair; Shabib, Ishraq; Haider, Waseem

doi:10.1016/j.surfcoat.2018.03.081

Cited by 22 publications

(10 citation statements)

References 63 publications

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“…The conversion coating technique has been widely used to achieve different phosphate coatings including calcium phosphate (Ca‐P), strontium phosphate, Zn–Ca–P coatings, and magnesium phosphate on Mg and its alloys. This method has also been used to coat Mg and its alloys with cerium coatings and magnesium fluoride (MgF 2 ) coatings …”

Section: Coating Techniques Applied For Mg Alloysmentioning

confidence: 99%

“…Apart from phosphate coatings, this technique is widely used to coat MgF 2 layers on the Mg alloys. The generally used method is the boiling of samples in NaOH solutions followed by immersion in the hydrofluoric (HF) acid for a definite period of time . The study of MgF 2 coated AZ31 alloy showed that the corrosion resistance of the alloy increased with coating time.…”

Section: Coating Techniques Applied For Mg Alloysmentioning

confidence: 99%

“…On the other hand, the elastic moduli of other prospective biomaterials such as Fe, Zn, and Ti are 211.4, 90, and 120 GPa, respectively . The small difference between the elastic moduli of Mg and bone significantly reduce the possibility of stress shielding of the bones inside the body . Higher the gap between the elastic moduli of implant material and bone, higher will be the chances of stress shielding.…”

Section: Introductionmentioning

confidence: 99%

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The current trends of Mg alloys in biomedical applications—A review

2018

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Magnesium (Mg) has emerged as an ideal alternative to the permanent implant materials owing to its enhanced properties such as biodegradation, better mechanical strengths than polymeric biodegradable materials and biocompatibility. It has been under investigation as an implant material both in cardiovascular and orthopedic applications. The use of Mg as an implant material reduces the risk of long-term incompatible interaction of implant with tissues and eliminates the second surgical procedure to remove the implant, thus minimizes the complications. The hurdle in the extensive use of Mg implants is its fast degradation rate, which consequently reduces the mechanical strength to support the implant site. Alloy development, surface treatment, and design modification of implants are the routes that can lead to the improved corrosion resistance of Mg implants and extensive research is going on in all three directions. In this review, the recent trends in the alloying and surface treatment of Mg have been discussed in detail. Additionally, the recent progress in the use of computational models to analyze Mg bioimplants has been given special consideration.

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Section: Coating Techniques Applied For Mg Alloysmentioning

confidence: 99%

Section: Coating Techniques Applied For Mg Alloysmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The current trends of Mg alloys in biomedical applications—A review

2018

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“…The in-situ reactions produced MgF 2 layers on Mg alloy substrate. Owing to the nature barrier of the MgF 2 coating [27,28], the corrosion reaction decreased after immersion in NaCl solution. However, in those chemical reactions, H 2 was produced.…”

Section: Resultsmentioning

confidence: 99%

Ultrasonic Treatment Induced Fluoride Conversion Coating without Pores for High Corrosion Resistance of Mg Alloy

Sheng¹,

Yi²,

Zhu³

et al. 2020

Coatings

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Fluoride conversion (MgF2) coating with facile preparation and good adhesion is promising to protect Mg alloy, but defects of pores in the coating lead to limited corrosion resistance. In this study, a compact and dense MgF2 coating was prepared by the combination of fluoride treatment and ultrasonic treatment. The ultrasonically treated MgF2 coating showed a compact and dense structure without pores at the frequency of 28 kHz. The chemical compositions of the coating were mainly composed of F and Mg elements. The corrosion potential of the ultrasonically treated Mg alloy shifted towards the noble direction in the electrochemical tests. The corrosion current density decreased due to the protectiveness of MgF2 coating without defects of pores or cracks. During immersion tests for 24 h, the ultrasonically treated Mg alloy exhibited the lowest H2 evolution (0.32 mL/cm2) and pH value (7.3), which confirmed the enhanced anti-corrosion ability of MgF2 coating. Hence, the ultrasonically treated fluoride coating had great potentials for their use in anti-corrosion applications of Mg alloy.

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“…It is known to stimulate the proliferation of osteoblasts and increase the new mineral deposition of cancellous bone, as it substitutes for the hydroxyl group in hydroxyapatite to form fluorapatite [27,28]. At present, a large amount of research has focused on MgF 2 coatings on magnesium and its alloys through chemical conversion using various concentrations of hydrofluoric acid and/or temperatures, which improved corrosion resistance and cytocompatibility [28][29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Fluoride-Incorporated Plasma Electrolytic Oxidation Coatings on the AZ31 Magnesium Alloy

Yang

Zhang

et al. 2019

Coatings

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In this study, films with different fluorine contents were prepared on an AZ31 magnesium alloy by using plasma electrolytic oxidation to study the corrosion resistance and cytocompatibility of the alloy. The morphology of the coating surface, phase, and chemical elements were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), and energy-dispersive X-ray spectrometry (EDS). The changes in the corrosion resistance with different fluorine contents were investigated by electrochemical experiments, hydrogen evolution, and long-term immersion tests. In addition, murine fibroblast L-929 cells were adopted for in vitro cytotoxicity tests using the cell counting kit (CCK)-8 assay, and the morphology of the cells was observed simultaneously by inverted microscopy. The results showed that the main form of the fluorine ions in the plasma electrolytic oxidation coatings was magnesium fluoride (MgF2). In addition, the corrosion resistance and cytocompatibilities of the coatings were improved by the addition of fluoride ions. When the content of potassium fluoride reached 10 g/L, the cell compatibility and corrosion resistance were the best, a finding which provides a basis for the clinical applications of the AZ31 magnesium alloy in the biomedical field.

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An insight into the effect of buffer layer on the electrochemical performance of MgF2 coated magnesium alloy ZK60

Cited by 22 publications

References 63 publications

The current trends of Mg alloys in biomedical applications—A review

The current trends of Mg alloys in biomedical applications—A review

Ultrasonic Treatment Induced Fluoride Conversion Coating without Pores for High Corrosion Resistance of Mg Alloy

Preparation and Characterization of Fluoride-Incorporated Plasma Electrolytic Oxidation Coatings on the AZ31 Magnesium Alloy

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