Complex Material and Surface Analysis of Anterolateral Distal Tibial Plate of 1.4441 Steel

Metals

Kamila Dostalova¹  Katerina Peterek Dedkova¹  Pavel Sova²  Josef Hlinka²  Timothy E. L. Douglas³  Karel Frydrysek⁴  Jan Koutecky⁵  Roman Madeja⁶ 

[1] Centre for Advanced Innovation Technologies, VSB-Technical University of Ostrava, 17. Listopadu 2172/15, 708 00 Ostrava-Poruba, Czech Republic;Department of Materials Engineering, Faculty of Materials and Technology, VSB-Technical University of Ostrava, 17. Listopadu 2172/15, 708 00 Ostrava-Poruba, Czech Republic;Engineering Department, Gillow Avenue, Lancaster University, Lancaster LA1 4YW, UK;Institute of Emengency Medicine, University of Ostrava, Syllabova 19, 703 00 Ostrava, Czech Republic;Medin a.s., Vlachovicka 619, 592 31 Nove Mesto na Morave, Czech Republic;Trauma Center, University Hospital Ostrava, 17. Listopadu 1790, 708 52 Ostrava-Poruba, Czech Republic;

关键词: pitting corrosion;    microstructure;    implant;    traumatology;    cytotoxicity;    surface contact angle;   

DOI  :  10.3390/met12010060

来源: DOAJ

【 摘 要 】

Nickel-based austenitic stainless steels are still common for manufacture of implants intended for acute hard tissue reinforcement or stabilization, but the risk of negative reactions due to soluble nickel-rich corrosion products must be considered seriously. Corrosion processes may even be accelerated by the evolution of microstructure caused by excessive heat during machining, etc. Therefore, this study also deals with the investigation of microstructure and microhardness changes near the threaded holes of the anterolateral distal tibial plate containing approx. 14wt.% Ni by composition. There were only insignificant changes of microhardness, grain size, or microstructure orientation found close to the area of machining. In addition, wettability measurements of surface energy demonstrated only minor differences for bulk material and areas close to machining. The cyclic potentiodynamic polarization tests were performed in isotonic physiological solution. The first cycle was used for the determination of corrosion characteristics of the implant after chemical passivation, the second cycle was used to simulate real material behavior under the condition of previous surface damage by excessive pitting corrosion occurring during previous polarization. It was found that the damaged and spontaneously repassived surface showed a three-time higher standard corrosion rate than the “as received” chemically passivated surface. One may conclude that previous surface damage may decrease the lifetime of the implant significantly and increase the amount of nickel-based corrosion products distributed into surrounding tissues.

【 授权许可】

Unknown