Uțu Diana, Muntean Roxana, Anghel Petculescu Iasmina-Mădălina, Hulka Iosif, Uțu Ion-Dragoș
Department of Pharmacology-Pharmacotherapy, Faculty of Pharmacy, Victor Babes University of Medicine and Pharmacy Timisoara, Eftimie Murgu Sq. 2, 300041 Timisoara, Romania.
Department of Materials and Fabrication Engineering, Politehnica University Timisoara, Bulevardul Mihai Viteazul nr.1, 300222 Timisoara, Romania.
Materials (Basel). 2025 Mar 15;18(6):1294. doi: 10.3390/ma18061294.
The electrochemical co-deposition of various hard particles with metals or metal alloys has been recently studied, especially for developing wear-resistant coatings. In the current work, pure cobalt and cobalt-diamond composite coatings were electrochemically deposited onto a low-alloy steel substrate and further investigated in terms of microstructure, corrosion behavior, and tribological characteristics. The electrodeposition process was carried out using direct current, from an additive-free electrolyte containing 300 g L CoSO, 50 g L CoCl and 30 g L HBO with and without diamond particles. Scanning electron microscopy (SEM) combined with energy-dispersive X-ray spectroscopy (EDS) was used for the microstructural characterization correlated with the chemical composition identification of the resulting coatings. The pure Co coatings showed a dense microstructure with a nodular morphology. In contrast, for the Co-diamond composite coatings, more elongated grains were observed containing a uniform distribution of the reinforcing diamond particles. The corrosion resistance was evaluated by potentiostatic polarization measurements in 3.5 wt.% NaCl solution, while the sliding wear resistance was assessed using the ball-on-disk testing method. The experimental results demonstrated that incorporating diamond particles into the cobalt deposition electrolyte positively impacted the tribological performance of the resulting composite coatings without significantly affecting the corrosion properties. Both cobalt and the composite coatings demonstrated substantially superior wear characteristics and corrosion resistance compared to the steel substrate.
最近人们对各种硬质颗粒与金属或金属合金的电化学共沉积进行了研究，特别是用于开发耐磨涂层。在当前工作中，将纯钴和钴 - 金刚石复合涂层电化学沉积到低合金钢基体上，并进一步对其微观结构、腐蚀行为和摩擦学特性进行了研究。电沉积过程采用直流电，从含有300 g/L CoSO₄、50 g/L CoCl₂和30 g/L H₃BO₃且添加或不添加金刚石颗粒的无添加剂电解液中进行。扫描电子显微镜（SEM）结合能量色散X射线光谱（EDS）用于与所得涂层的化学成分鉴定相关的微观结构表征。纯Co涂层呈现出具有结节形态的致密微观结构。相比之下，对于Co - 金刚石复合涂层，观察到更多细长晶粒，其中含有均匀分布的增强金刚石颗粒。通过在3.5 wt.% NaCl溶液中进行恒电位极化测量来评估耐腐蚀性，同时使用球盘测试方法评估滑动耐磨性。实验结果表明，将金刚石颗粒加入钴沉积电解液中对所得复合涂层的摩擦学性能有积极影响，而对腐蚀性能没有显著影响。与钢基体相比，钴涂层和复合涂层都表现出明显更优越的磨损特性和耐腐蚀性。
