Preparation and characterization of PLA coating and PLA/MAO composite coatings on AZ31 magnesium alloy for improvement of corrosion resistance

Shi, Ping; Niu, Bo; Shanshan, E; Chen, Yang; Li, Qiang

doi:10.1016/j.surfcoat.2014.11.069

Cited by 128 publications

(44 citation statements)

References 41 publications

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“…The impedance parameters derived from the plots are given in Table 5. The polarization resistance, which is regarded as a measure of corrosion resistance, is calculated by R 1 and R 2 , and the impedance of the spectrum is mainly determined by R 2 [45,46]. Figure 6 shows that R 1 and R 2 increased with increasing KF content in the electrolyte, which indicates that the films had a better corrosion resistance with an increase in KF concentration, as is consistent with the results of E corr in Table 4.…”

Section: Elemental Compositionsupporting

confidence: 81%

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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Section: Elemental Compositionsupporting

confidence: 81%

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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“…Suitable surface modification methods have been used to improve the surface properties required for different clinical applications. The most used surface-modifying method is based on the deposition of a protective metal oxide thin film using techniques such as physical vapor deposition (PVD) [11], micro-arc oxidation [12], electrodeposition, sol-gel [13], and magnetron sputtering [14]. The protective metal oxide thin film is stable and can determine the corrosion behavior and tissue biocompatibility of the implant.…”

Section: Introductionmentioning

confidence: 99%

Zinc oxide surface functionalization and related effects on corrosion resistance of titanium implants

Trino

Dias

Albano

et al. 2018

Ceramics International

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Important clinical concerns in orthopedics and dental implantology are associated with a significant release of titanium (Ti) metal ions and debris due to the low corrosion resistance of this material. Chemical modifications on Ti surfaces have been performed in order to minimize effects of corrosion. In this contribution, zinc oxide (ZnO) thin films were deposited onto Ti surfaces and functionalized with four different organic bifunctional molecules in order to increase the corrosion resistance. SEM and XPS indicated the formation of nanostructured ZnO thin film with hydroxyl groups available for covalent functionalization. The adhesion mechanism analyzed by XPS suggest that the attachment on ZnO occurs by carboxylic acid, silane, thiol and hydroxyl groups for 4aminophenylpropionic acid (APPA), 3-aminopropyltrimetoxysilane (APTMS), 3-mercaptopropionic acid (MPA), and polyethylene glycol (PEG) molecules. Electrochemical analysis for the functionalized ZnO specimens with APPA showed noble open circuit potentials (−0.2 V) and significant decrease in the corrosion current density (5.3 × 10 −7 A/cm 2) when compared to the values obtained for pristine Ti (−0.56 V and 2.3 × 10 −6 A/cm 2), indicating a promising material for applications in biomedical fields.

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“…Scanning electron microscopy (SEM) observations were made of the thickness of the MgO coating, as well as density measurements and coating adhesion measurements to obtain the acceptable adhesion strength of the fabricated MgO coating layer with the substrate. The minimum required value for the adhesion strength of coatings to the implants is 22 MPa, according to ASTM1147-F [41,47].…”

Section: Preparation Of the Powder Samples Of Uncoated Mgo-coated Anmentioning

confidence: 99%

“…In addition, the anticorrosion ability and hemocompatibility of Mg alloy for biomedical application has been significantly improved by MgO coating synthesized using micro-arc oxidation in a multi-step surface modification process. A porous MgO coating as an intermediate layer was prepared on the surface of AZ31 magnesium alloy to improve corrosion resistance [41]. Brink [42] added MgO to a series of bioactive glasses to maintain bioactivity.…”

Section: Introductionmentioning

confidence: 99%

Biodegradable Mg/HA/TiO2 Nanocomposites Coated with MgO and Si/MgO for Orthopedic Applications: A Study on the Corrosion, Surface Characterization, and Biocompatability

et al. 2017

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Abstract:In the field of orthopedics, magnesium (Mg) and magnesium-based composites as biodegradable materials have attracted fundamental research. However, the medical applications of magnesium implants have been restricted owing to their poor corrosion resistance, especially in the physiological environment. To improve the corrosion resistance of Mg/HA/TiO 2 nanocomposites, monolayer MgO and double-layer Si/MgO coatings were fabricated layer-by-layer on the surface of a nanocomposite using a powder metallurgy route. Then, coating thickness, surface morphology, and chemical composition were determined, and the corrosion behavior of the uncoated and coated samples was evaluated. Field-emission scanning electron microscopy (FE-SEM) micrographs show that an inner MgO layer with a porous microstructure and thickness of around 34 µm is generated on the Mg/HA/TiO 2 nanocomposite substrate, and that the outer Si layer thickness is obtained at around 23 µm for the double-layered coated sample. Electrochemical corrosion tests and immersion corrosion tests were carried out on the uncoated and coated samples and the Si/MgO-coated nanocomposite showed significantly improved corrosion resistance compared with uncoated Mg/HA/TiO 2 in simulated body fluid (SBF). Corrosion products comprising Mg(OH) 2 , HA, Ca 3 (PO 4 ) 2 , and amorphous CaP components were precipitated on the immersed samples. Improved cytocompatibility was observed with coating as the cell viability ranged from 73% in uncoated to 88% for Si/MgO-coated Mg/HA/TiO 2 nanocomposite after nine days of incubation.

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Preparation and characterization of PLA coating and PLA/MAO composite coatings on AZ31 magnesium alloy for improvement of corrosion resistance

Cited by 128 publications

References 41 publications

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

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

Zinc oxide surface functionalization and related effects on corrosion resistance of titanium implants

Biodegradable Mg/HA/TiO2 Nanocomposites Coated with MgO and Si/MgO for Orthopedic Applications: A Study on the Corrosion, Surface Characterization, and Biocompatability

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