Analysis of electrodeposition processes to obtain calcium phosphate layer on AZ31 alloy

Monasterio, Nuria; Ledesma, Julieta; Aranguiz, I.; García-Romero, Ana; Zuza, Ester

doi:10.1016/j.surfcoat.2017.03.060

Cited by 15 publications

(12 citation statements)

References 36 publications

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“…Electrodeposition method is the most commonly used technique to deposit Ca‐P‐based coatings on Mg alloys . Wen et al studied Ca‐P coating on AZ31 by ECD in a solution of Ca(NO 3 ) 2 , NH 4 H 2 PO 4 , and NaNO 3 at 85°C for 60 min in the presence of graphite anode.…”

Section: Coating Techniques Applied For Mg Alloysmentioning

confidence: 99%

“…To counter the above‐mentioned problem, the concept of ECD with pulsed power was introduced . The pulsed method can either be pulse potential method or pulse current method . Monasterio et al performed the scanning electron microscope and X‐ray diffraction (XRD) analysis on coatings from four ECD methods and proved that the coatings achieved by constant current and pulsed current method were more uniform and adhesive as compared to coatings by constant potential and pulsed potential method .…”

Section: Coating Techniques Applied For Mg Alloysmentioning

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%

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

2018

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“…In this work, for the first time NaOH and ZnSO 4 have been used to modify Ca-P coatings' morphology by a wet chemical method on the surface of an AM50 alloy. In work [36], the modification of the calcium phosphate coatings was based on a change in electrodeposition parameters. It should be noted that wet chemical deposition is a less expensive method than electrodeposition.…”

Section: Discussionmentioning

confidence: 99%

Study of the Morphology and Properties of Biocompatible Ca-P Coatings on Mg Alloy

et al. 2019

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Magnesium alloys are considered as potential biomaterials for use in orthopedic implantology. The main barrier to the use of Mg alloys in medicine is their overly fast and irregular degradation in body fluids. The use of protective calcium phosphate coatings to increase the corrosion resistance of Mg alloy (AM50 alloy: 4 wt.% Al, 0.3 wt.% Mn, 0.2 wt.% Zn, rest Mg) was examined in this study. The scientific goal of the study was the assessment of the influence of calcium phosphate layer morphology on the corrosion process in Ringer’s solution. Modification of the coating morphology was obtained by changing the chemical composition of the phosphatizing bath using NaOH (NaAM50 sample) or ZnSO4 (ZnAM50 sample). In practice, a more dense and uniform coating could be obtained by the immersion of AM50 alloy in a solution containing ZnSO4 (ZnAM50 sample). In this study, an adhesion test performed on the ZnAM50 sample indicated that the critical load was 1.35 N. XRD phase analysis confirmed that the obtained coatings included dicalcium phosphate dihydrate (CaHPO4*2H2O). The coatings prepared on the NaAM50 and ZnAM50 samples are effective barriers against the progress of corrosion deeper into the substrate. After 120 h immersion in Ringer’s solution, the volume of the evolved hydrogen was 5.6 mL/cm2 for the NaAM50 and 3.4 mL/cm2 for the ZnAM50 sample.

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“…Finally, it was investigated whether potentiostatic or galvanostatic conditions are preferable, considering that studies in the biomedical literature have shown that controlling potential or current may lead to significantly different results [30]. For a given setup ( Figure 3a) and treatment duration (3 h), the effects of applying a constant potential of −2 or −3 V (potentiostatic conditions) were compared to the effects of applying a constant current of −5 or −20 mA (galvanostatic conditions).…”

Section: Influence Of the Experimental Setupmentioning

confidence: 99%

“…Nature and concentration of the calcium and phosphate salts used as CaP precursors. Typically, Ca(NO 3 ) 2 and (NH 4 )H 2 PO 4 (ADP) are used, with a molar ratio of 10/6 to reproduce the Ca/P atomic ratio in stoichiometric hydroxyapatite [15,[18][19][20][21][22][23][24][25][26][27][28][29][30][31]; • Electrokinetic parameters, namely the electric potential (E) and the current density (i). Typically, these parameters vary in the range E = −1.4 ÷ (−3) V and i = 0.5 ÷ 25 mA/cm 2 [13,14,16,18-25, 29,30,32]; • Possible application of pulsed electric potential.…”

Section: Introductionmentioning

confidence: 99%

Electrodeposition of Hydroxyapatite Coatings for Marble Protection: Preliminary Results

et al. 2019

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Surface coatings made of hydroxyapatite (HAP) have been proposed to protect marble artworks from dissolution in rain, originated by the aqueous solubility of calcite. However, HAP coatings formed by wet chemistry exhibit incomplete coverage of marble surface, which results in limited protective efficacy. In this study, electrodeposition was explored as a new route to possibly form continuous coatings over the marble surface, leaving no bare areas. Electrodeposition was performed by placing marble samples in poultices containing the electrolyte (an aqueous solution with calcium and phosphate precursors) and the electrodes. The influence of several parameters was investigated, namely the role of the working electrode (cathode or anode), the distance between the marble sample and the working electrode, the deposition conditions (potentiostatic or galvanostatic), the electrolyte composition and concentration, the applied voltage, and time. The coating morphology and composition were assessed by SEM/EDS and FT-IR. The protective ability of the most promising formulations was then evaluated, in all cases comparing electrodeposition with traditional wet synthesis methods. The results of the study suggest that electrodeposition is able to accelerate and improve formation of HAP coatings over the marble surface, even though the obtained protective efficacy is not complete yet.

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Analysis of electrodeposition processes to obtain calcium phosphate layer on AZ31 alloy

Cited by 15 publications

References 36 publications

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

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

Study of the Morphology and Properties of Biocompatible Ca-P Coatings on Mg Alloy

Electrodeposition of Hydroxyapatite Coatings for Marble Protection: Preliminary Results

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