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.

在这项工作中，含有 1、3、6 wt.% Ca 的二元 Al-Ca 合金样品是在铸造条件下生产的。研究了钙含量对等离子电解氧化涂层结构和性能的影响。通过显微结构分析、X射线衍射研究所得涂层，并通过维氏法测定显微硬度。随着合金钙含量的增加，涂层厚度增加。涂层内部孔隙率随着Al中Ca含量的增加而增加。根据横截面的元素分布图和图表，内层的特征是铝和氧几乎均匀分布，而外层则包含广泛的硅和钙区域。此外，涂层外层中的钙含量与其在合金中的含量成比例增加。X射线相分析结果显示涂层组合物中存在α-Al ₂ O ₃、γ-Al ₂ O _{3和一定比例的非晶相。}合金中钙含量的增加导致涂层相组成(α-Al ₂ O ₃ /g-Al ₂ O ₃ )的显着变化，从而防止α-Al ₂ O ₃的形成。相组成的变化和α-Al ₂ O ₃相形成的抑制有助于涂层平均显微硬度从Al1Ca合金上形成的970HV显着降低到Al6Ca合金上形成的涂层的744HV 。以铸态二元铝钙合金 Al1Ca (28 HV )、Al3Ca (36 HV )、Al6Ca (56 HV ) 为例，由于以下原因，表面硬度可能显着提高至 512–1197 HV演示了通过等离子体电解氧化形成涂层。