Muntean Roxana, Uțu Ion-Dragoș
Department of Materials and Manufacturing Engineering, Politehnica University Timișoara, Piața Victoriei 2, 300006 Timișoara, Romania.
Materials (Basel). 2025 Jul 13;18(14):3302. doi: 10.3390/ma18143302.
The friction surfacing (FS) process has emerged over the past few years as a method for joining both similar and dissimilar materials, for volume damage repair of defective components, and for corrosion protection. The possibility to produce a metallic coating by FS, without melting the material, classifies this technique as distinct from other standard methods. This unconventional deposition method is based on the severe plastic deformation that appears on a rotating metallic rod (consumable material) pressed against the substrate under an axial load. The present study aims to investigate the tribological properties and corrosion resistance provided by the aluminum-based FS coatings deposited onto a structural S235 steel substrate and further modified by plasma electrolytic oxidation (PEO). During the PEO treatment, the formation of a ceramic film is enabled, while the hardness, chemical stability, corrosion, and wear resistance of the modified surfaces are considerably increased. The morpho-structural characteristics and chemical composition of the PEO-modified FS coatings are further investigated using scanning electron microscopy combined with energy dispersive spectroscopy analysis and X-ray diffraction. Dry sliding wear testing of the PEO-modified aluminum-based coatings was carried out using a ball-on-disc configuration, while the corrosion resistance was electrochemically evaluated in a 3.5 wt.% NaCl solution. The corrosion rates of the aluminum-based coatings decreased significantly when the PEO treatment was applied, while the wear rate was substantially reduced compared to the untreated aluminum-based coating and steel substrate, respectively.
摩擦堆焊（FS）工艺在过去几年中已成为一种连接同种和异种材料、修复有缺陷部件的体积损伤以及提供腐蚀防护的方法。通过FS工艺在不熔化材料的情况下生产金属涂层的可能性，使该技术有别于其他标准方法。这种非常规的沉积方法基于在轴向载荷作用下，旋转的金属棒（可消耗材料）压在基体上时出现的严重塑性变形。本研究旨在研究沉积在结构S235钢基体上并通过等离子体电解氧化（PEO）进一步改性的铝基FS涂层的摩擦学性能和耐腐蚀性。在PEO处理过程中，可以形成陶瓷膜，同时改性表面的硬度、化学稳定性、耐腐蚀性和耐磨性会显著提高。使用扫描电子显微镜结合能量色散光谱分析和X射线衍射进一步研究PEO改性FS涂层的形态结构特征和化学成分。采用球盘配置对PEO改性铝基涂层进行干滑动磨损试验，同时在3.5 wt.%的NaCl溶液中对其耐腐蚀性进行电化学评估。施加PEO处理后，铝基涂层的腐蚀速率显著降低，而磨损率分别比未处理的铝基涂层和钢基体大幅降低。
