Investigation of the influence of high-pressure torsion and solution treatment on corrosion and tribocorrosion behavior of CoCrMo alloys for biomedical applications

• Published in: Crystals (Basel) Vol. 13; no. 4; pp. 1 - 14
• Main Authors: Yilmazer, Hakan, Caha, Ihsan, Dikici, Burak, Toptan, Fatih, Isik, Murat, Niinomi, Mitsuo, Nakai, Masaaki, Alves, Alexandra Manuela Vieira Cruz Pinto
• Format: Journal Article
• Language: English
• Published: Basel Multidisciplinary Digital Publishing Institute 30-03-2023; MDPI AG
• Subjects: Alloys; Biocompatibility; Biomaterials; Biomedical engineering; Biomedical materials; Body temperature; Buffers; Cobalt base alloys; CoCrMo; Corrosion and anti-corrosives; Corrosion potential; Corrosion resistance; Corrosion tests; Electrochemical impedance spectroscopy; Grain boundaries; Grain size; Heat; High pressure; Investigations; Mechanical properties; Metal fatigue; Microstructure; Optical microscopes; Process parameters; Science & Technology; Severe plastic deformation; Solution heat treatment; Specialty metals industry; Technology application; Transmission electron microscopes; Transplants & implants; Tribocorrosion; Japan
• ISSN: 2073-4352; 2073-4352
• DOI: 10.3390/cryst13040590

In this study, the influence of the high-pressure torsion (HPT) processing parameters and solution treatment (ST) on the corrosion and tribocorrosion behavior of CoCrMo (CCM) alloys was investigated for possible usage in biomedical applications. The corrosion behavior of the CCM alloys was investigated by using potentiodynamic scanning (PDS) and electrochemical impedance spectroscopy (EIS) tests. Tribocorrosion tests were carried out in a reciprocating ball-on-plate tribometer at 1 Hz, 1 N load, and 3 mm stroke length for 2 h. All electrochemical measurements were performed using a potentiostat in standard phosphate-buffered saline (PBS) solution at body temperature (37 ± 2 ◦C). The samples were characterized by using a scanning electron microscope (SEM), transmission electron microscope (TEM), optical microscope (OM), and X-ray diffraction (XRD). The deepness and width of wear tracks were examined by using a profilometer. The results showed that HPT and ST processes did not affect significantly the corrosion resistance of samples. However, the ST-treated samples had a higher material loss during sliding in standard phosphate-buffered saline (PBS) at body temperature as compared to HPT-treated samples.
This work was supported by Yildiz Technical University Scientific Research Projects Coordination Unit under project number of 2016-07-02-KAP01, and partially by Portuguese Foundation for Science and Technology (FCT), Portugal, under UIDB/04436/2020 project.