Dobruchowska Ewa, Schulz Justyna, Zavaleyev Viktor, Walkowicz Jan, Suszko Tomasz, Warcholinski Bogdan
Faculty of Mechanical Engineering and Energetics, Koszalin University of Technology, Sniadeckich 2, 75-453 Koszalin, Poland.
Materials (Basel). 2024 Sep 12;17(18):4487. doi: 10.3390/ma17184487.
The purpose of the study was to ascertain the corrosion resistance in Hanks' solution of Cr-Ni-Mo stainless steel (AISI 316L) coated with diamond-like carbon (DLC) coatings to establish its suitability for biomedical applications, e.g., as temporary implants. The influence of the carbon coating thickness as well as the correlated effect of the metallic sublayer type and defects present in DLC films on corrosion propagation were discussed. The results obtained were compared with findings on the adhesion of DLC to the steel substrate. The synthesis of carbon thin films with Cr and Ti adhesive sublayers was performed using a combined DC and a high-power-impulse vacuum-arc process. Evaluation of the corrosion resistance was carried out by means of potentiodynamic polarisation tests and scanning electron microscopy. Adhesive properties of the sublayer/DLC coating systems were measured using a scratch tester. It was found that systems with Ti sublayers were less susceptible to the corrosion processes, particularly to pitting. The best anti-corrosion properties were obtained by merging Ti with a DLC coating with a thickness equal to 0.5 μm. The protective properties of the Cr/DLC systems were independent of the carbon coating thickness. On the other hand, the DLC coatings with the Cr sublayer showed better adhesion to the substrate.
该研究的目的是确定涂有类金刚石碳（DLC）涂层的Cr-Ni-Mo不锈钢（AISI 316L）在汉克斯溶液中的耐腐蚀性，以确定其作为临时植入物等生物医学应用的适用性。讨论了碳涂层厚度的影响以及DLC薄膜中金属底层类型和缺陷对腐蚀扩展的相关影响。将获得的结果与DLC与钢基底附着力的研究结果进行了比较。采用直流与高功率脉冲真空电弧联合工艺合成了带有Cr和Ti粘结底层的碳薄膜。通过动电位极化试验和扫描电子显微镜对耐腐蚀性进行了评估。使用划痕测试仪测量了底层/DLC涂层系统的粘结性能。发现带有Ti底层的系统对腐蚀过程的敏感性较低，尤其是对点蚀的敏感性。通过将Ti与厚度为0.5μm的DLC涂层结合，获得了最佳的防腐性能。Cr/DLC系统的防护性能与碳涂层厚度无关。另一方面，带有Cr底层的DLC涂层与基底的附着力更好。
