Localized currents and pH distribution studied during corrosion of MA8 Mg alloy in the cell culture medium

Gnedenkov, Andrey S.; Mei, Di; Lamaka, Sviatlana V.; Sinebryukhov, Sergey L.; Mashtalyar, Dmitry V.; Vyaliy, Igor E.; Zheludkevich, Mikhail L.; Gnedenkov, Sergey V.

doi:10.1016/j.corsci.2020.108689

Cited by 54 publications

(25 citation statements)

References 95 publications

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“…The use of SBF is due to the proximity of its ionic composition to the ionic composition of human blood plasma (Table 2) [51]. MEM also imitates the inorganic composition of human blood plasma as well as organic composition to mimic the protein of mammalian cells [52]. Tests in MEM were performed at room temperature.…”

Section: Electrochemical Properties Of Coatingsmentioning

confidence: 99%

Bioactive Coatings Formed on Titanium by Plasma Electrolytic Oxidation: Composition and Properties

et al. 2020

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Bioactive coatings on VT1-0 commercially pure titanium were formed by the plasma electrolytic oxidation (PEO). A study of the morphological features of coatings was carried out using scanning electron microscopy. A composition of formed coatings was investigated using energy-dispersive spectroscopy and X-ray diffractometry analysis. It was shown that PEO-coatings have calcium phosphate in their composition, which increases the bioactivity of the surface layer. Electrochemical properties of the samples were studied by potentiondynamic polarization and electrochemical impedance spectroscopy in different physiological media: simulated body fluid and minimum essential medium. The data of electrochemical studies indicate more than 15 times decrease in the corrosion current density for the sample with coating (5.0 × 10−9 A/cm2) as compared to the bare titanium (7.7 × 10−8 A/cm2). The formed PEO-layers have elastoplastic properties close to human bone (12–30 GPa) and a lower friction coefficient in comparison with bare metal. The wettability of PEO-layers increased. The contact angle for formed coatings reduced by more than 60° in comparison with bare metal (from 73° for titanium to 8° for PEO-coating). Such an increase in surface hydrophilicity contributes to the greater biocompatibility of the formed coating in comparison with commercially pure titanium. PEO can be prospective as a method for improving titanium surface bioactivity.

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Section: Electrochemical Properties Of Coatingsmentioning

confidence: 99%

Bioactive Coatings Formed on Titanium by Plasma Electrolytic Oxidation: Composition and Properties

et al. 2020

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“…According to the results of the curves, the highest corrosion current was observed for samples containing ammonia, ethanolamine and additive mixtures at pH = 10.5. In addition, the corrosion potential of the samples with pH = 10.5 also decreased to the values of the more active (cathodic) potentials due to more surface interactions and consequently higher surface dissolution of the substrate [31].…”

Section: Resultsmentioning

confidence: 94%

Investigation of the corrosion behavior of aluminum bronze alloy in alkaline environment

Asgari

Foratirad

Golabadi

et al. 2021

Materialwissenschaft Werkst

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In this study, the effect of amino‐based additives including ammonia, ethanolamine and a mixture of two additives on the pH change of condenser water and corrosion behavior of aluminum bronze alloy as a structural material of condenser were investigated. The results of polarization curves, wheel tests and inductively coupled plasma showed that by increasing the pH from 8.5 to 10.5, the corrosion rate of aluminum bronze alloy and the dissolution rate of alloying elements are increased. The effect of amino‐based additives at the same pH is similar to each other. A comparison of corrosion rates determined by polarization curves. The corrosion rates for solutions contained ammonia and ethanolamine additives at pH = 10.5, were 2.92 ⋅ 10−2 and 4.55 ⋅ 10−2 mm/y respectively. The wheel test results indicated that the corrosion rates of solutions containing different additives increased to 1.1028 mm/y and 0.4504 mm/y for solutions containing ammonia and ethanolamine, respectively. Therefore, due to similar environmental conditions in the condenser and the wheel test because of the presence perturbation and biphasic fluid, it can be concluded that at pH above 10, aluminum bronze alloy has lower corrosion rate in the cooling water containing ethanolamine than ammonia additives.

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“…This Mg matrix is prone to be internal galvanic attacked due to a very negative electrode potential [ 52 , 53 , 54 ]. Localized alkalinization also occurs at cathodic sites [ 47 , 55 ], with an increased pH value of up to 10–11 [ 55 ]. This can approach the passivity region of Mg [ 53 ] and lead to the formation of a partially protective outer porous Mg(OH) 2 film and a dehydrated MgO inner layer [ 47 , 56 , 57 , 58 , 59 ].…”

Section: Corrosion Behaviormentioning

confidence: 99%

Corrosion Behavior in Magnesium-Based Alloys for Biomedical Applications

Liu

Sun

et al. 2022

Materials

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Magnesium alloys exhibit superior biocompatibility and biodegradability, which makes them an excellent candidate for artificial implants. However, these materials also suffer from lower corrosion resistance, which limits their clinical applicability. The corrosion mechanism of Mg alloys is complicated since the spontaneous occurrence is determined by means of loss of aspects, e.g., the basic feature of materials and various corrosive environments. As such, this study provides a review of the general degradation/precipitation process multifactorial corrosion behavior and proposes a reasonable method for modeling and preventing corrosion in metals. In addition, the composition design, the structural treatment, and the surface processing technique are involved as potential methods to control the degradation rate and improve the biological properties of Mg alloys. This systematic representation of corrosive mechanisms and the comprehensive discussion of various technologies for applications could lead to improved designs for Mg-based biomedical devices in the future.

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Localized currents and pH distribution studied during corrosion of MA8 Mg alloy in the cell culture medium

Cited by 54 publications

References 95 publications

Bioactive Coatings Formed on Titanium by Plasma Electrolytic Oxidation: Composition and Properties

Bioactive Coatings Formed on Titanium by Plasma Electrolytic Oxidation: Composition and Properties

Investigation of the corrosion behavior of aluminum bronze alloy in alkaline environment

Corrosion Behavior in Magnesium-Based Alloys for Biomedical Applications

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