Pieretti Eurico Felix, Piaggio Davide, Costa Isolda
Nuclear and Energy Research Institute, São Paulo 05508-000, Brazil.
School of Engineering, University of Warwick, Coventry CV4 7AL, UK.
Materials (Basel). 2025 Aug 27;18(17):4020. doi: 10.3390/ma18174020.
Marking techniques are employed to guarantee the identification and traceability of biomedical materials. This study investigated the impact of laser and mechanical marking processes on the tribological performance of ISO 5832-1 austenitic stainless steel (SS), specifically examining corrosion resistance, the coefficient of friction, and wear volume in ball-cratering wear tests. The laser marking was performed using a nanosecond Q-switched Nd:YAG laser. Cytotoxicity tests assessed the biocompatibility of the biomaterial. Non-marked surfaces were also evaluated for comparison. A phosphate-buffered saline solution (PBS) served as both the lubricant and corrosion medium. The surface finishing was analyzed using optical microscopy and scanning electron microscopy coupled with a field-emission gun (SEM-FEG), combined with an energy-dispersive X-ray spectrometer. The oxide film was examined through X-ray photoelectron spectroscopy (XPS). Wear tests lasted 10 min, with PBS drops applied every 10 s at 75 rpm; solid balls of AISI 316L stainless steel (SS) and polypropylene (PP), each 1 inch in diameter, were used as counter-bodies. Corrosion resistance was assessed using electrochemical methods. Results showed variations in roughness and microstructure due to laser marking. The tribological behaviour was influenced by the type of marking process, and the wear amount depended on the normal force and ball nature. None of the samples was considered cytotoxic, although laser-marked surfaces exhibited the lowest cellular viability among the tested surfaces and the lowest corrosion resistance.
标记技术用于确保生物医学材料的识别和可追溯性。本研究调查了激光和机械标记工艺对ISO 5832-1奥氏体不锈钢（SS）摩擦学性能的影响，具体考察了在球坑磨损试验中的耐腐蚀性、摩擦系数和磨损量。激光标记采用纳秒调Q Nd:YAG激光进行。细胞毒性试验评估了生物材料的生物相容性。还对未标记的表面进行了评估以作比较。磷酸盐缓冲盐水溶液（PBS）用作润滑剂和腐蚀介质。使用光学显微镜和配备场发射枪的扫描电子显微镜（SEM-FEG）结合能量色散X射线光谱仪对表面光洁度进行了分析。通过X射线光电子能谱（XPS）检查氧化膜。磨损试验持续10分钟，以75转/分钟的速度每10秒滴加一次PBS；直径为1英寸的AISI 316L不锈钢（SS）和聚丙烯（PP）实心球用作对磨体。使用电化学方法评估耐腐蚀性。结果表明，激光标记导致粗糙度和微观结构发生变化。摩擦学行为受标记工艺类型的影响，磨损量取决于法向力和球的性质。尽管激光标记表面在测试表面中表现出最低的细胞活力和最低的耐腐蚀性，但没有一个样品被认为具有细胞毒性。
