Magnesium fabricated using additive technology: Specificity of corrosion and protection

Gnedenkov, Sergey V.; Sinebryukhov, Sergey L.; Egorkin, Vladimir S.; Mashtalyar, D. V.; Vyaliy, Igor E.; Nadaraia, Konstantine V.; Imshinetskiy, I.M.; Nikitin, Alexander; Субботин, Е. П.; Gnedenkov, Andrey S.

doi:10.1016/j.jallcom.2019.07.341

Cited by 41 publications

(15 citation statements)

References 80 publications

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“…However, taking into account the composition of the thermal oxide layer, the biocompatibility of this coating remains in question. In this regard, considerable attention is currently being paid to methods for forming coatings containing calcium phosphate compounds [12,[23][24][25]. Among these methods, plasma electrolytic oxidation (PEO) can be distinguished, which allows one, due to varying the electrolyte composition and formation modes, to significantly change the composition and structure of the synthesized surface layer [26][27][28][29][30][31][32][33][34][35][36][37][38][39].…”

Section: Introductionmentioning

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: Introductionmentioning

confidence: 99%

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

et al. 2020

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“…Базовое покрытие формировали методом ПЭО в различных водных растворах, при соблюдении определенных условий. Состав и концентрации растворов подбирали на основе анализа литературных данных [266][267][268] и результатов собственных экспериментов [87,131,138,269].…”

Section: 20 распределение потенциала отражающее анодную область на сп...unclassified

Современные Концепции Изучения Процессов Коррозионной Деградации Материалов И Покрытий: Теория, Практика, Методология Исследований

2022

Физико-Химические Основы Локальной Гетерогенной Коррозии Магниевых И Алюминиевых Сплавов

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В настоящее время самыми популярными металлическими материалами, используемыми в промышленности, являются сталь, чугун, а также медные, цинковые, титановые, алюминиевые и магниевые сплавы. Исследования, освещенные в данной мо- нографии, проводились на магниевых и алюминиевых сплавах.

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“…Under those conditions, the different composition and microstructures of the Mg alloys developed similar and stable interface and bulk pH values. An interface pH between 10 and 11 units, the typical value for degradation of Mg alloys in simple NaCl solutions, [ 28–30 ] and higher degradation rates were revealed for under immersion in HBSS in the absence of Ca 2+ cations. In turn, an interface pH between 7.8 and 8.5 pH units and significantly lower degradation rates were found with the presence of Ca 2+ cations.…”

Section: Introductionmentioning

confidence: 99%

Mg Biodegradation Mechanism Deduced from the Local Surface Environment under Simulated Physiological Conditions

González

Lamaka

Mei

et al. 2021

Adv Healthcare Materials

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Although certified magnesium-based implants are launched some years ago, the not well-defined Mg degradation mechanism under physiological conditions makes it difficult to standardize its use as a degradable biomaterial for a wide range of implant applications. Among other variables influencing the Mg degradation mechanism, monitoring the pH in the corrosive solution and, especially, at the corroding interface is important due to its direct relation with the formation and stability of the degradation products layer. The interface pH (pH at the Mg/solution interface) developed on Mg-2Ag and E11 alloys are studied in situ during immersion under dynamic conditions (1.5 mL min -1 ) in HBSS with and without the physiological amount of Ca 2+ cations (2.5 × 10 -3 m). The results show that the precipitation/dissolution of amorphous phosphate-containing phases, that can be associated with apatitic calcium-phosphates Ca 10-x (PO 4 ) 6-x (HPO 4 or CO 3 ) x (OH or ½ CO 3 ) 2-x with 0 ≤ x ≤ 2 (Ap-CaP), promoted in the presence of Ca 2+ generates an effective local pH buffering system at the surface. Thus, high alkalinization is prevented, and the interface pH is stabilized in the range of 7.6 to 8.5.

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Magnesium fabricated using additive technology: Specificity of corrosion and protection

Cited by 41 publications

References 80 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

Современные Концепции Изучения Процессов Коррозионной Деградации Материалов И Покрытий: Теория, Практика, Методология Исследований

Mg Biodegradation Mechanism Deduced from the Local Surface Environment under Simulated Physiological Conditions

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