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09-03-2024

Plasma Electrolytic Oxidation of Aluminum-Calcium Binary Alloys in a Cast Condition

Authors: N. V. Letyagin, T. К. Akopyan, A. A. Sokorev, A. G. Tsydenov

Published in: Metallurgist | Issue 9-10/2024

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Abstract

In this work specimens of binary Al–Ca alloys containing 1, 3, 6 wt.% Ca are produced in a cast condition. The effect of the calcium content on coating structure and properties formed by plasma electrolytic oxidation is studied. The coatings obtained are studied by microstructural analysis, X-ray diffraction, and microhardness is determined by the Vickers method. There is an increase in coating thickness with an increase in alloy calcium content. Coating internal porosity increases with increasing amount of Ca in Al. According to element distribution maps and graphs over the cross section there is an inner layer characterized by almost uniform distribution of aluminum and oxygen, while the outer layer contains an extensive silicon and calcium region. In addition, calcium content in the outer layer of a coating increases in proportion to its content within the alloy. Results of X-ray phase analysis reveal α -Al₂O₃, γ-Al₂O₃ and a certain proportion of amorphous phase within a coating composition. An increase in calcium content in the alloy leads to a significant change in phase composition of a coating (α-Al₂O₃/g-Al₂O₃), preventing formation of α -Al₂O₃. The change in phase composition and suppression of α -Al₂O₃ phase formation contributes to a significant reduction in coating average microhardness from 970 HV formed on Al1Ca alloy to 744 HV for a coating formed on Al6Ca alloy. Using the example of binary aluminum-calcium alloys Al1Ca (28 HV), Al3Ca (36 HV), Al6Ca (56 HV) in the as-cast state, the possibility of a significant increase in surface hardness up to 512–1197 HV due to the formation of coatings by plasma electrolytic oxidation is demonstrated.

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Title: Plasma Electrolytic Oxidation of Aluminum-Calcium Binary Alloys in a Cast Condition
Authors: N. V. Letyagin
T. К. Akopyan
A. A. Sokorev
A. G. Tsydenov
Publication date: 09-03-2024
Publisher: Springer US
Published in: Metallurgist / Issue 9-10/2024
Print ISSN: 0026-0894
Electronic ISSN: 1573-8892
DOI: https://doi.org/10.1007/s11015-024-01624-6

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