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Metallurgist

Erschienen in:

12.03.2024

Structure and Properties of Coatings Formed on Cast Al–Ca Alloys by Plasma Electrolytic Oxidation

verfasst von: N. V. Letyagin, T. К. Akopyan, A. A. Sokorev, A. G. Tsydenov, A. F. Musin, P. A. Palkin

Erschienen in: Metallurgist | Ausgabe 9-10/2024

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Abstract

The structure and properties of coatings formed by plasma electrolytic oxidation (PEO) on as-cast Al–Ca alloy (7 wt.% Ca) and pure Al (99.99 wt.% Al) are studied. It is shown that substrates have a significant impact on the quality, structure and properties of a coating formed. According to SEM analysis results, presence of Ca within a substrate leads to an increase in coating thickness, an increase in inner layer porosity, as well as formation of a wide calcium-containing region within a coating outer layer. Calcium contributes to a significant change in coating phase composition (α-Al₂O₃/g-Al₂O₃), preventing a-Al₂O₃ formation. A change in phase composition leads to a reduction in coating average microhardness from 912 HV on pure aluminum to 714 HV for a coating upon Al–Ca alloy. The electrochemical behavior of as-cast Al7Ca alloy and PEO-treated alloys in 3.5% NaCl solution is studied. As a result of electrochemical studies, it is found that a PEO coating significantly increases corrosion resistance, demonstrating a decrease in corrosion current density (0.410–3 mA/cm²) compared with an uncoated specimen (7.1× 10^–3 mA/cm²). A coating formed upon pure aluminum due to greater uniformity shows a lower corrosion current density value (0.0710–3 mA/cm²) and improved corrosion properties.

Vorheriger Artikel Anodic Behavior of AK7 Aluminum Alloy and Composite Material of the Al–Al2O3 System within an NaCl Electrolyte Solution Medium

Nächster Artikel Material Science Aspects of Titanium Tube Production. Part 2. Production of Cold-Rolled Tubes

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Titel: Structure and Properties of Coatings Formed on Cast Al–Ca Alloys by Plasma Electrolytic Oxidation
verfasst von: N. V. Letyagin
T. К. Akopyan
A. A. Sokorev
A. G. Tsydenov
A. F. Musin
P. A. Palkin
Publikationsdatum: 12.03.2024
Verlag: Springer US
Erschienen in: Metallurgist / Ausgabe 9-10/2024
Print ISSN: 0026-0894
Elektronische ISSN: 1573-8892
DOI: https://doi.org/10.1007/s11015-024-01640-6

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