Leksycki Kamil, Kaczmarek-Pawelska Agnieszka, Ochał Kamil, Gradzik Andrzej, Pimenov Danil Yurievich, Giasin Khaled, Chuchala Daniel, Wojciechowski Szymon
Institute of Mechanical Engineering, University of Zielona Gora, 4 Prof. Z. Szafrana Street, 65-516 Zielona Gora, Poland.
Department of Materials Science, The Faculty of Mechanical Engineering and Aeronautics, Rzeszow University of Technology, Powstancow Warszawy 12, 35-959 Rzeszow, Poland.
Materials (Basel). 2021 Nov 16;14(22):6917. doi: 10.3390/ma14226917.
The influence of cooling conditions and surface topography after finish turning of Ti6Al4V titanium alloy on corrosion resistance and surface bioactivity was analyzed. The samples were machined under dry and minimum quantity lubrication (MQL) conditions to obtain different surface roughness. The surface topographies of the processed samples were assessed and measured using an optical profilometer. The produced samples were subjected to electrochemical impedance spectroscopy (EIS) and corrosion potential tests () in the presence of simulated body fluid (SBF). The surface bioactivity of the samples was assessed on the basis of images from scanning electron microscopy (SEM) and energy-dispersive spectroscopy (EDS) analysis. The inspection of the surfaces of samples after turning under dry and MQL conditions revealed unevenly distributed precipitation of hydroxyapatite compounds (Ca/P) with a molar ratio in the range of 1.73-1.97. Regardless of the cutting conditions and surface roughness, the highest values of ~0 mV were recorded on day 7 of immersion in the SBF solution. The impedance characteristics showed that, compared to the MQL conditions, surfaces machined under dry conditions were characterized by greater resistance and the presence of a passive layer on the processed surface. The main novelty of the paper is the study of the effect of ecological machining conditions, namely, dry and MQL cutting on the corrosion resistance and surface bioactivity of Ti6Al4V titanium alloy after finish turning. The obtained research results have practical significance. They can be used by engineers during the development of technological processes for medical devices made of Ti6Al4V alloy to obtain favorable functional properties of these devices.
分析了Ti6Al4V钛合金精车后冷却条件和表面形貌对耐腐蚀性和表面生物活性的影响。在干式和微量润滑（MQL）条件下对样品进行加工，以获得不同的表面粗糙度。使用光学轮廓仪对加工后样品的表面形貌进行评估和测量。在模拟体液（SBF）存在的情况下，对制备的样品进行电化学阻抗谱（EIS）和腐蚀电位测试（）。基于扫描电子显微镜（SEM）图像和能谱（EDS）分析对样品的表面生物活性进行评估。对干式和MQL条件下车削后的样品表面检查发现，羟基磷灰石化合物（Ca/P）沉淀分布不均匀，摩尔比在1.73-1.97范围内。无论切削条件和表面粗糙度如何，在SBF溶液中浸泡7天时记录到的最高值约为0 mV。阻抗特性表明，与MQL条件相比，干式条件下加工的表面具有更大的电阻，且加工表面存在钝化层。本文的主要创新点是研究了生态加工条件，即干式和MQL切削对Ti6Al4V钛合金精车后耐腐蚀性和表面生物活性的影响。所获得的研究结果具有实际意义。在开发由Ti6Al4V合金制成的医疗设备的工艺过程中，工程师们可以利用这些结果来获得这些设备良好的功能特性。
