TY - JOUR

T1 - Regulation of biocorrosion of AZ31-type magnesium alloy by atomic layer deposition of Al2O3 nanocoatings

AU - Козлова, Лада Андреевна

AU - Вартиайнен , Владислава

AU - Кириченко, Сергей Олегович

AU - Рытова, Мария

AU - Годун, Антон Павлович

AU - Колесниченко, Юлия

AU - Юдинцева , Наталия Михайловна

AU - Калганов, Владимир Дмитриевич

AU - Ложкин, Максим Сергеевич

AU - Морозова, Наталия

AU - Максимов, Максим

AU - Назаров, Денис Васильевич

PY - 2025/7/15

Y1 - 2025/7/15

N2 - The present study systematically investigates the effect of Al2O3 coatings with thicknesses approximately ranging from 20 to 100 nm on the biocorrosion of AZ31-type alloy. The coating was carried out by means of the atomic layer deposition, and the thickness, composition, morphology and conformality of the coatings were studied by spectral ellipsometry, SEM, SEM-EDX, AFM, XRD, ED-XRF and XPS. Ringer solution, phosphate-buffered saline (PBS) and simulated body fluid (SBF) were utilised as media for the biocorrosion study, and the dynamics of the process were examined by three independent methods during 14 days of sample immersion. Supplementary electrochemical studies were conducted, and a substantial variation was identified in the corrosion rate and stability of the coatings across different solutions, with SBF yielding the most favourable outcomes. The coatings demonstrated high efficacy in mitigating biocorrosion during the initial three days of the study. The reduction in hydrogen release in SBF for 100 nm thick coatings reached up to sevenfold, and mass loss was almost two orders of magnitude. With extended immersion times, the effect of the coatings diminished, yet persisted even following a 14-day immersion period. The MTT test utilising preosteoblasts MG-63 cells for all samples exhibited either no or low levels of toxicity.

AB - The present study systematically investigates the effect of Al2O3 coatings with thicknesses approximately ranging from 20 to 100 nm on the biocorrosion of AZ31-type alloy. The coating was carried out by means of the atomic layer deposition, and the thickness, composition, morphology and conformality of the coatings were studied by spectral ellipsometry, SEM, SEM-EDX, AFM, XRD, ED-XRF and XPS. Ringer solution, phosphate-buffered saline (PBS) and simulated body fluid (SBF) were utilised as media for the biocorrosion study, and the dynamics of the process were examined by three independent methods during 14 days of sample immersion. Supplementary electrochemical studies were conducted, and a substantial variation was identified in the corrosion rate and stability of the coatings across different solutions, with SBF yielding the most favourable outcomes. The coatings demonstrated high efficacy in mitigating biocorrosion during the initial three days of the study. The reduction in hydrogen release in SBF for 100 nm thick coatings reached up to sevenfold, and mass loss was almost two orders of magnitude. With extended immersion times, the effect of the coatings diminished, yet persisted even following a 14-day immersion period. The MTT test utilising preosteoblasts MG-63 cells for all samples exhibited either no or low levels of toxicity.

KW - AZ31

KW - Al2O3

KW - Atomic layer deposition

KW - Biocorrosion

KW - Magnesium implants

UR - https://www.mendeley.com/catalogue/826edcad-ee2d-3c39-bbd3-6b7837708a2d/

U2 - 10.1016/j.surfin.2025.106775

DO - 10.1016/j.surfin.2025.106775

M3 - Article

VL - 69

JO - Surfaces and Interfaces

JF - Surfaces and Interfaces

SN - 2468-0230

M1 - 106775

ER -