In the present study, the corrosion behaviour of CoCrMo ASTM F75 alloy with boride diffusion layer and under simulated physiological conditions has been investigated using electrochemical methods. Corrosion has been analyzed using Tafel and electrochemical impedance spectroscopy (EIS) curves. The corrosion resistance optimization of boride diffusion layer on ASTM F-75 alloy using a central composite design (CCD) in response surface methodology (RSM) has been studied. A boronizing thermochemical treatment has been carried out at different temperatures, time periods and paste mass. The roughness for samples subjected to boride annealing has been higher than that of the unboride sample. X-ray diffraction (XRD) measurement has shown that the boride layer of the sample at least consists of a mixture of CoB and CrB phases. The EIS and Tafel curves results have suggested that boride ASTM F75 alloy has not been a suitable candidate for orthopedics applications.

中文翻译：

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硼化物扩散层在CoCrMo合金表面的腐蚀行为

在本研究中，使用电化学方法研究了具有硼化物扩散层的CoCrMo ASTM F75合金在模拟生理条件下的腐蚀行为。已经使用Tafel和电化学阻抗谱（EIS）曲线分析了腐蚀。研究了使用响应面方法（RSM）的中央复合设计（CCD）优化ASTM F-75合金上硼化物扩散层的耐蚀性。在不同的温度，时间段和焊膏质量下进行了硼化热化学处理。经受硼化物退火的样品的粗糙度已经高于未硼化物样品的粗糙度。X射线衍射（XRD）测量表明，样品的硼化物层至少由CoB和CrB相的混合物组成。