In this study, diamond powder was incorporated into oxide layers formed on 6061 Al alloy by using plasma electrolytic oxidation (PEO) method. Diamond powder, 1.5 μm in average size, was added in an amount of 0, 3, 6 and 9 g/L, respectively, into the electrolyte containing 0.15 M Na₂SiO₃ and 0.16 M H₃BO₃. Phases, microstructure and composition of the oxide layers were investigated by XRD, SEM and EDX analyses. Micro-hardness of the coatings was measured using a micro-indenter. Corrosion performance of PEO coatings was evaluated using potentiodynamic polarization in a solution of 3.5% NaCl. Wear resistance was evaluated using a ball-on-disk tribometer. Both XRD and EDX spectra prove the incorporation of diamond into the coating. With increasing content of diamond powder in the electrolyte, analytical results indicate that the thickness, roughness, corrosion and wear resistance of the coatings increase. PEO coatings obtained with an optimum diamond powder content 6 g/L shows the best performance. The best corrosion resistance is 9.70 × 10⁸ Ω cm², the highest micro-hardness 855 HV, the lowest average friction coefficient 0.29, and showing the least weight and volume losses after wear tests. Performance of the coatings deteriorates when obtained at a higher content of added diamond powder, 9 g/L. This is due to the sudden increase of both porosity and roughness of the coatings. The variation in coating performance is explained based on the evolution of phase, microstructure, micro-hardness, porosity and roughness with the amount of diamond incorporation.

在这项研究中，采用等离子电解氧化（PEO）方法将金刚石粉末掺入在6061铝合金上形成的氧化物层中。将平均尺寸为1.5μm的金刚石粉分别以0、3、6和9 g / L的量添加到含有0.15 M Na ₂ SiO ₃和0.16 M H ₃ BO ₃的电解液中。通过XRD，SEM和EDX分析研究了氧化物层的相，微观结构和组成。使用微压头测量涂层的显微硬度。使用在3.5％NaCl溶液中的电位动力极化来评估PEO涂层的腐蚀性能。使用圆盘摩擦计评估耐磨性。XRD和EDX光谱均证明金刚石已掺入涂层中。随着电解液中金刚石粉含量的增加，分析结果表明涂层的厚度，粗糙度，腐蚀和耐磨性都在增加。最佳金刚石粉含量为6 g / L的PEO涂层表现出最佳性能。耐蚀性最好是9.70×10 ⁸  Ω厘米²，最高显微硬度855 HV，最低平均摩擦系数0.29，并且在磨损测试后显示出最小的重量和体积损失。当以更高含量的9 g / L的金刚石粉末添加时，涂层的性能会下降。这是由于涂层的孔隙率和粗糙度突然增加所致。基于相，微观结构，显微硬度，孔隙率和粗糙度随金刚石掺入量的变化来解释涂层性能的变化。