Corrosion resistance of zinc-magnesium-aluminium alloy coated steel in marine atmospheric environments

International Journal of Electrochemical Science, Год журнала: 2024, Номер 19(8), С. 100705 - 100705

Опубликована: Июнь 27, 2024

In this study, a salt-spray accelerated experiment was conducted as simulated corrosion test of hot-dip galvanised zinc-magnesium-aluminium-coated alloy steel under marine atmospheric environment. addition, scanning electron microscopy, confocal X-ray diffraction, and electrochemical workstations were used to conduct analyses on the macro-morphology, microstructure, product composition, etc. after test. Furthermore, role Mg in resistance zinc-magnesium-aluminium sheets determined. The research results indicated that environment, zinc-aluminium-magnesium has excellent resistance, its external coating provides protection substrate. products mainly include Al2O3, AlOOH, zinc hydroxychloride (Zn5(OH)8Cl2·H2O), layered bimetallic hydroxides (Mg6Al2(OH)16CO3·4H2O), ZnO, MgCO3·H2O. addition magnesium facilitates formation insoluble products, which protect iron

Язык: Английский

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Verifying the cytotoxicity of a biodegradable zinc alloy with nanodiamond sensors

Biomaterials Advances, Год журнала: 2024, Номер 162, С. 213927 - 213927

Опубликована: Июнь 21, 2024

Metals are widely utilized as implant materials for bone fixtures well stents. Biodegradable versions of these implants highly desirable since patients do not have to undergo a second surgery the be removed. Attractive options such zinc silver alloys they also offer benefit being antibacterial. However, it is important investigate effect degradation products on surrounding cells, taking into account cytotoxicity. Here we investigated alloyed with 1 % (Zn1Ag) and how differently concentrated extracts (1 %-100 %) this material impact human umbilical vein endothelial cells (HUVECs). More specifically, focused free radical generation oxidative stress cell viability. To determine production used diamond-based quantum sensing conventional fluorescent assays. The viability was assessed by observing morphology metabolic activity via MTT assay. We found that 10 tolerated cells. at higher extract concentrations observed severe stress. were able show detect significant even lowest tested concentrations.

Язык: Английский

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Corrosion behavior, mechanical properties, and in-vitro biocompatibility of cast Mg–3Zn–xSi biodegradable alloys for bone regeneration

SN Applied Sciences, Год журнала: 2023, Номер 5(9)

Опубликована: Авг. 28, 2023

Abstract In this research, Mg–3Zn–xSi (x = 0, 0.1, 0.3, and 0.6 wt%) biodegradable alloys were produced by simple stir casting method, their microstructure phase changes evaluated using X-ray diffraction (XRD), optical microscope (OM) scanning electron coupled with energy dispersive x-ray analysis (SEM–EDS). Potentiodynamic polarization was conducted to measure the alloys’ corrosion behavior in simulated body fluid (SBF). Tensile strength test in-vitro biocompatibility evaluation regarding MTT cytotoxicity, ALP osseointegration assay MG-63 cell growth pattern conducted. Electrochemical investigations showed that Mg–3Zn enclosing Si attained degradation rates suitable for structural support until bone healing, while alloy without had a rate of 0.128 mm/year which is much lower than required value. None inspected exhibited significant cytotoxic effect, meanwhile, Mg–Zn base 0.3 wt% demonstrated highest level. The optimum 0.1 Si. Evidence calcium phosphate precipitation observed four investigated alloys. Therefore, based on fore mentioned results, suggested as viable materials due compatible rates, proved cytocompatibility, high viability excellent potential.

Язык: Английский

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Electrochemical anodization of cast titanium alloys in oxalic acid for biomedical applications

Frontiers of Chemical Science and Engineering, Год журнала: 2023, Номер 18(1)

Опубликована: Ноя. 7, 2023

Abstract Titanium and its alloys have numerous biomedical applications thanks to the composition morphology of their oxide film. In this study, colorful films were formed by anodizing cast Ti-6Al-4V Ti-6Al-7Nb in a 10% oxalic acid solution for 30 s at different voltages (20–80 V) direct current power supply. Atomic force microscopy was used as an accurate tool measure surface roughness thin on nanometer scale. Scanning electron X-ray diffraction performed analyze phase structure. According results, produced titanium layer showed high roughness, which increased with increasing voltage. The impact color anodized layers surveyed. corrosion resistance samples studied simulated body fluid pH 7.4 temperature 37 °C utilizing electrochemical impedance spectroscopy potentiodynamic polarization method. both 40 V optimal voltage, leading TiO 2 formation best compromise between thickness resistance. Also, findings that had superior properties compared those alloys, making them more appropriate orthopedic applications. From obtained data fruitful discussion, it found utilized procedure is simple, low-cost, repeatable. Therefore, anodization proved viable alternative finishing

Язык: Английский

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MgCa-Based Alloys Modified with Zn- and Ga-Doped CaP Coatings Lead to Controlled Degradation and Enhanced Bone Formation in a Sheep Cranium Defect Model

ACS Biomaterials Science & Engineering, Год журнала: 2024, Номер 10(7), С. 4452 - 4462

Опубликована: Июнь 14, 2024

Mg-based biodegradable metallic implants are gaining increased attraction for applications in orthopedics and dentistry. However, their current hampered by high rate of corrosion, degradation, rapid release ions gas bubbles into the physiological medium. The aim present study is to investigate osteogenic angiogenic potential coated a sheep cranial defect model. Although was studied some extent, regenerate vascularized bone formation not detail. We have magnesium–calcium (MgCa)-based alloys modified with zinc (Zn)- or gallium (Ga)-doped calcium phosphate (CaP) coatings as strategy control degradation while enhancing regeneration capacity. MgCa its CaP (MgCa/CaP) undoped doped Zn Ga (MgCa/CaP + MgCa/CaP Ga, respectively) were implanted defects created cranium. degraded faster than others at 4 weeks postop weight loss ca. 50%, it 15% <10% presence coating. Scanning electron microscopy (SEM) analysis implant surfaces also revealed that had largest degree structural breakdown all groups. Radiological evaluation surface modification induced better within well enhancement bone–implant integration. Bone volume (%) 25% case around group upon micro-CT evaluation. This >1.5-fold increase observed histopathological examination H&E- Masson's trichrome-stained sections. Immunohistochemical (antiosteopontin) neovascularization (anti-CD31) sites >2-fold expression markers both Ga- Zn-doped, CaP-coated implants. Zn-doped further presented low inflammatory reaction, notable regeneration, among These findings indicated coating an important achieve enhanced capacity made alloys.

Язык: Английский

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Characterization of microstructural and corrosion behavior of cold sprayed Zn11Al3Mg alloy coating

Surface and Coatings Technology, Год журнала: 2023, Номер 471, С. 129890 - 129890

Опубликована: Авг. 6, 2023

Язык: Английский

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Improved Mechanical Properties of Biocompatible Zn-1.7%Mg and Zn1.7%Mg-0.2%Zr Alloys Deformed with High-Pressure Torsion

Metals, Год журнала: 2023, Номер 13(11), С. 1817 - 1817

Опубликована: Окт. 27, 2023

The potential medical Zn-1.7%Mg and Zn-1.7%Mg-0.2%Zr alloys strengthened using high-pressure torsion (HPT) were investigated in this work. HPT led to a significant refinement of the microstructure both with formation an ultrafine-grained structure (UFG). average grain size after was ~700–800 nm for alloys. UFG increase ultimate tensile strength up 401 ± 16 482 12 MPa alloys, respectively. Additionally, variation ductility 56.3 16.9% 4.4 0.6%, respectively, also observed, apparently due textural changes. small degradation rate 1 day incubation medium. However, period 30 days slowed down process leveled difference between initial HPT-treated state did not affect cytotoxicity alloy contributed reduction hemolysis. Thus, processing accelerated their biodegradation without compromising biocompatibility.

Язык: Английский

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Effect of Longer Waiting Time During OCP and Pre-Applied Cleaning Potential In Corrosion Analysis of Zinc Metal

Türk doğa ve fen dergisi :/Türk doğa ve fen dergisi, Год журнала: 2023, Номер 12(3), С. 15 - 23

Опубликована: Сен. 27, 2023

Tafel analysis is a widely accepted technique for corrosion studies in electrochemistry. A general literature search one of the electronegative metals, zinc, revealed serious deviations results. In order to understand reasons behind these deviations, zinc metal was investigated at macro and micro levels during after analysis. In-situ surface investigation OCP period were performed, it found that undergoes proceeding attack following immersion 3.5 wt.% NaCl solution. exhibited pre-oxidation proceeds as nonuniform local regions. SEM-EDS XRD proved particular crystal planes form ZnO with increasing time. linear sweep voltammetry (LSV) applied detect oxygen removal starting hydrogen evolution potentials. Three identical experiments performed on samples without any treatment, another three consecutive which pre-reduction potential. Obtained results in-situ pre-applied reduction potential just before cleaned allowed uniform oxide formation, resulting lowest standard deviation calculated elements.

Язык: Английский

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The Effect of Germanium Additions on the Mechanical Properties of Zn-Mg-Al Alloys

Metals, Год журнала: 2024, Номер 14(7), С. 820 - 820

Опубликована: Июль 16, 2024

In this investigation, 0.19–1.8 wt.% of Ge was introduced into a ternary Zn-Mg-Al alloy. The introduction had significant impact on the microstructure, leading to formation Mg2Ge. area fraction eutectic phase diminished with increasing additions. Small-scale test techniques were utilised evaluate mechanical properties due changes in microstructure. alloys found be inherently harder compared standard hot-dip Zn-containing 0.2 Al. hardness and strength decreased increase

Язык: Английский

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Hybrid additive manufacturing for Zn-Mg casting for biomedical application

In vitro models, Год журнала: 2024, Номер 3(4-6), С. 157 - 168

Опубликована: Окт. 8, 2024

Язык: Английский

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