Influence of a MAO + PLGA coating on biocorrosion and stress corrosion cracking behavior of a magnesium alloy in a physiological environment

Chen, Lianxi; Sheng, Yuqi; Zhou, Hanyu; Li, Zhibin; Wang, Xiaojian; Li, Wei

doi:10.1016/j.corsci.2018.12.005

Cited by 99 publications

(31 citation statements)

References 33 publications

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“…The related parameters of SCC properties of some magnesium alloys before and after MAO or PEO coating treatment have been summarized in Table 4. 29,31,33,34 It can be seen that the SCC properties (ultimate tensile stress σ UTS ) of the substrate were all degraded in corrosive environment compared with that in air, in which the ultimate tensile stress σ UTS of AZ31 alloy displayed the highest drop (from 276.23 MPa in air to 31.39 MPa in NaCl solution). It demonstrated that the SCC properties deterioration of AZ31 alloy was worst in NaCl corrosive environment.…”

Section: Discussionmentioning

confidence: 99%

“…Chen et al. 29 studied the corrosion and SCC behavior of the micro-oxidized Mg–4Zn–0.6Zr–0.4Sr alloy in a physiological environment, results showed that the micro-arc oxidized (MAO) coating could improve the corrosion and the SCC resistance in a physiological environment. On the one hand, generally, the cool electrolyte environment reduced the probability of micro-crack formation, which was sensitive to the thermal stress.…”

Section: Introductionmentioning

confidence: 99%

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Stress corrosion cracking behavior of micro-arc oxidized AZ31 alloy

Liang

Zhang

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part C:

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The stress corrosion cracking behaviors of micro-arc oxidized AZ31 magnesium alloy were studied by using the slow tensile test in air and 3.5 wt.% NaCl solution. Results showed that compared with the substrate, the stress corrosion cracking susceptibility of the micro-arc oxidized specimens was obvious improved apparently in 3.5 wt.% NaCl solution, due to the good corrosion resistance of the specimens after micro-arc oxidized coating treatment. In addition, regardless of the micro-arc oxidized treatment, it was the mixed fracture in air and the cleavage fracture in 3.5 wt.% NaCl solution. The micro-arc oxidized coating had no direct effect on the fracture mechanism of the alloy. It was closely related to the nature of the material and the environment of the material servicing.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Stress corrosion cracking behavior of micro-arc oxidized AZ31 alloy

Liang

Zhang

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…Ti 3 C 2 MXene has been attracting great attention for its application in photothermal therapy [ 37 , 38 ], biosensors [ 39 ], and antibacterial agents [ 40 ] due to its excellent near infrared (NIR) absorption ability and biosafety. Similar to Ti 3 C 2 Mxene, the poly(lactic-co-glycolic acid) (PLGA) has been widely used in biomedical applications due to it has good biocompatibility, non-toxicity, good film-forming properties and good biodegradability, furthermore, it is approved by the Food and Drug Administration [ [41] , [42] , [43] ]. Earlier studies reported that the anti-corrosion performance of Mg-Zn alloy was improved through coating with PLGA [ 44 ].…”

Section: Introductionmentioning

confidence: 99%

Photo-controlled degradation of PLGA/Ti3C2 hybrid coating on Mg-Sr alloy using near infrared light

Liu

Huang

Liu

et al. 2021

Bioactive Materials

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A PLGA/Ti 3 C 2 hybrid coating was successfully deposited on the surface of magnesium-strontium (Mg-Sr) alloys. Compared with the corrosion current density ( i corr ) of the Mg-Sr alloy (7.13 × 10 −5 A/cm 2 ), the modified samples (Mg/PLGA/Ti 3 C 2 ) was lower by approximately four orders of magnitude (7.65 × 10 −9 A/cm 2 ). After near infrared 808 nm laser irradiation, the i corr of the modified samples increased to 3.48 × 10 −7 A/cm 2 . The mechanism is that the local hyperthermia induced the free volume expansion of PLGA, and the increase in intermolecular gap enhanced the penetration of electrolytes. Meanwhile, the cytotoxicity study showed that the hybrid coating endowed the Mg-Sr alloy with enhanced biocompatibility.

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“…Nevertheless, the poor corrosion resistance due to the low electrode potential and non-compact natural oxidation passive film [3,4], is still the major drawback [5,6]. Surface modification is a main strategy to protect Mg alloys from corrosion [7][8][9]. Generally, the surface modifications can provide a barrier to avoid Mg alloy contacting with the corrosive medium.…”

Section: Introductionmentioning

confidence: 99%

“…For instances, hydroxyapatite/bio-glass composite coating (about 1 μm) on Ti-6Al-4V alloy, has better bio-activity and higher adhesive strength than mono hydroxyapatite coating [10]. The micro-arc oxidation layer sealed with poly composite layer (about 70 μm) on Mg alloy, would has significantly improvement in corrosion resistance and less stress corrosion cracking, compared with mono micro-arc oxidation coating [7]. The Al 2 O 3 -CeO 2 composite coating (about 29 μm) on 7075 aluminum alloy, has the about 1/10 3 i corr as that of mono Al 2 O 3 film [11].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and corrosion behaviors of AZ31 alloy with an amorphous-crystallin nano-composite film

Liu

et al. 2020

Mater. Res. Express

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Magnesium (Mg) alloy has drawn considerable attention for lightweight structural and functional materials, whereas its corrosion resistance still requires to be enhanced. A new strategy for corrosion resistance has been proposed as making an amorphous-crystalline nano-composite film on Mg alloys. The film as the composition as Al 2 O 3 /GaN with a thickness of 20 nm was prepared on AZ31 Mg alloy by atomic layer deposition. Grazing incidence x-ray diffraction, scanning electron microscopy equipped with energy-dispersive spectroscopy, transmission electron microscopy, x-ray photoelectron spectroscopy, and nano indentation tester have been used to characterize the film in details. It is verified the sample has an amorphous/crystalline/Mg interface structure, and a surface with homogeneous elemental distribution and higher hardness. Neutral salt spray test shows the film changes the corroded mode from pitting corrosion to uniform corrosion. Furthermore, electrochemical measurements indicate that the film would raise E corr (ΔE corr =+0.295 V), drop i corr (about 1/10 times), and make electrical equivalent circuits change from R s (CPE R ct (R L L)) to R s (CR f ) (CPE R ct (R L L)). All evaluations show that better corrosion resistance has been by inducing the amorphouscrystalline nano film. The amorphous layer in the film would make a more homogeneous Cl − distribution in the surface and act as a barrier to block the penetration of corrosion medium in the early stage. During corrosion, the interface between the layers in the film could retard the corrosion crack propagating further. The film would be favorate to form a denser corrosion product layer finally. A more uniform and lower corrosion occurs for AZ31 Mg alloy with this nano-composite film.

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Influence of a MAO + PLGA coating on biocorrosion and stress corrosion cracking behavior of a magnesium alloy in a physiological environment

Cited by 99 publications

References 33 publications

Stress corrosion cracking behavior of micro-arc oxidized AZ31 alloy

Stress corrosion cracking behavior of micro-arc oxidized AZ31 alloy

Photo-controlled degradation of PLGA/Ti3C2 hybrid coating on Mg-Sr alloy using near infrared light

Microstructure and corrosion behaviors of AZ31 alloy with an amorphous-crystallin nano-composite film

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