Самовосстанавливающиеся покрытия, содержащие слоистые двойные гидроксиды, импрегнированные ингибитором коррозии, для антикоррозионной защиты магниевых сплавов

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Abstract

Методом плазменного электролитического оксидирования на поверхности магниевого сплава МА8 сформирована пористая керамикоподобная матрица. Проведена функционализация поверхности гетерооксидного слоя путем формирования пленки из слоистых двойных гидроксидов. Предложено несколько методов интеркаляции образованных наноконтейнеров ингибитором коррозии (бензотриазолом). Изучены состав, морфология, коррозионное поведение и механизм самозалечивания сформированного покрытия.

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А. С. Гнеденков

ФГБУН Институт химии Дальневосточного отделения Российской академии наук

Author for correspondence.
Email: asg17@mail.com
Russian Federation, Владивосток

С. Л. Синебрюхов

ФГБУН Институт химии Дальневосточного отделения Российской академии наук

Email: asg17@mail.com
Russian Federation, Владивосток

А. Д. Номеровский

ФГБУН Институт химии Дальневосточного отделения Российской академии наук

Email: asg17@mail.com
Russian Federation, Владивосток

С. В. Гнеденков

ФГБУН Институт химии Дальневосточного отделения Российской академии наук

Email: asg17@mail.com
Russian Federation, Владивосток

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Supplementary files

Supplementary Files
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2. Fig. 1. SEM images and maps of the distribution of elements on the surface of PEO-LDH-BTA (upper panel, a) and PEO-LDH(BTA) (lower panel, b) samples.

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3. Fig. 2. SEM image and element distribution maps across the cross-section of the PEO-LDG coating sample. Areas in the SEM image: MA8 alloy – 1, PEO layer – 2, LDH layer – 3, epoxy resin – 4.

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4. Fig. 3. Diffraction patterns obtained by XRD for MA8 alloy with different protective coatings. The following samples were studied: MA8 – 1, PEO –2, PEO-SDG – 3, PEO-SDG-BTA – 4, PEO-SDG(BTA) –5.

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5. Fig. 4. Raman spectra, optical images, and distribution maps of LDH (a) and BTA (b) for the studied samples. Raman spectra for the PEO-LDH-BTA and PEO-LDH(BTA) samples were recorded at the points marked on the maps. The studied samples were: PEO – 1, PEO-LDH – 2, PEO-LDH-BTA – 3, PEO-LDH(BTA) – 4, BTA powder – 5, LDH powder – 6.

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6. Fig. 5. PDP curves for samples after 1 hour of exposure in 3.5% NaCl solution. The following samples were studied: MA8 – 1, PEO – 2, PEO-LDH – 3, PEO-LDH-BTA – 4, PEO-LDH(BTA) – 5.

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7. Fig. 6. Distribution of local pH (SIET maps) on the surface of protective coatings with artificially created defects, obtained with different holding times of samples in 0.05 M NaCl solution, and optical images of scanned areas (before holding – I, after 24 h holding – II). The following samples were studied: PEO – 1, PEO-LDH – 2, PEO-LDH(BTA) – 3, PEO-LDH-BTA – 4.

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8. Fig. 7. Local current density distribution (SVET maps) for samples with artificially created defects on the surface of protective coatings, obtained at different times of sample holding in 0.05 M NaCl solution, and optical images of scanned areas (before holding – I, after 24 h of holding – II) (a). Change in local pH and local current density for samples with artificially created defects on the surface of protective coatings when held in 0.05 M NaCl solution (b). The following samples were studied: PEO – 1, PEO-LDH – 2, PEO-LDH(BTA) – 3, PEO-LDH-BTA – 4.

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9. Fig. 8. Mechanism of corrosion degradation of magnesium alloy MA8 with PEO-LDH(BTA) coating (a) and base PEO coating (b). I – a defect appears in the coating (a, b); II – initiation of the corrosion process, leading to dissolution of magnesium (a, b); diffusion of BTA into the defective zone with formation of Mg(BTA-H)2 (a); III – BTA molecules and the Mg(BTA-H)2 layer inhibit the corrosion process, resulting in formation of crystalline Mg(OH)2 (a); loose products of Mg(OH)2 are formed in the defective zone of the base PEO coating (b).

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