Effect of the Thickness of TiO2 Films on the Structure and Corrosion Behavior of Mg-Based Alloys
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Department of Engineering Materials and Biomaterials, Faculty of Mechanical Engineering, Silesian University of Technology, Konarskiego 18a, 44-100 Gliwice, Poland
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HTL-Strefa S.A., Adamowek 7, 95-035 Ozorkow, Poland
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Łukasiewicz Research Network, Institute of Non-Ferrous Metals, Sowinskiego 5, 44-100 Gliwice, Poland
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Professor Zbigniew Religa Foundation of Cardiac Surgery Development, Bioengineering Laboratory, Wolności 345a, 41-800 Zabrze, Poland
*
Author to whom correspondence should be addressed.
Materials 2020, 13(5), 1065; https://doi.org/10.3390/ma13051065
Received: 2 February 2020
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Revised: 19 February 2020
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Accepted: 26 February 2020
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Published: 28 February 2020
(This article belongs to the Special Issue Structure and Properties of Crystalline and Amorphous Alloys)
This article discusses the influence of the thickness of TiO2 films deposited onto MgCa2Zn1 and MgCa2Zn1Gd3 alloys on their structure, corrosion behavior, and cytotoxicity. TiO2 layers (about 200 and 400 nm thick) were applied using magnetron sputtering, which provides strong substrate adhesion. Such titanium dioxide films have many attractive properties, such as high corrosion resistance and biocompatibility. These oxide coatings stimulate osteoblast adhesion and proliferation compared to alloys without the protective films. Microscopic observations show that the TiO2 surface morphology is homogeneous, the grains have a spherical shape (with dimensions from 18 to 160 nm). Based on XRD analysis, it can be stated that all the studied TiO2 layers have an anatase structure. The results of electrochemical and immersion studies, performed in Ringer’s solution at 37 °C, show that the corrosion resistance of the studied TiO2 does not always increase proportionally with the thickness of the films. This is a result of grain refinement and differences in the density of the titanium dioxide films applied using the physical vapor deposition (PVD) technique. The results of 24 h immersion tests indicate that the lowest volume of evolved H2 (5.92 mL/cm2) was with the 400 nm thick film deposited onto the MgCa2Zn1Gd3 alloy. This result is in agreement with the good biocompatibility of this TiO2 film, confirmed by cytotoxicity tests.
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Keywords:
TiO2 films; Mg-based alloys; structure study; electrochemical study; hydrogen evolution; cytotoxicity assays
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MDPI and ACS Style
Kania, A.; Nolbrzak, P.; Radoń, A.; Niemiec-Cyganek, A.; Babilas, R. Effect of the Thickness of TiO2 Films on the Structure and Corrosion Behavior of Mg-Based Alloys. Materials 2020, 13, 1065. https://doi.org/10.3390/ma13051065
AMA Style
Kania A, Nolbrzak P, Radoń A, Niemiec-Cyganek A, Babilas R. Effect of the Thickness of TiO2 Films on the Structure and Corrosion Behavior of Mg-Based Alloys. Materials. 2020; 13(5):1065. https://doi.org/10.3390/ma13051065
Chicago/Turabian StyleKania, Aneta, Piotr Nolbrzak, Adrian Radoń, Aleksandra Niemiec-Cyganek, and Rafał Babilas. 2020. "Effect of the Thickness of TiO2 Films on the Structure and Corrosion Behavior of Mg-Based Alloys" Materials 13, no. 5: 1065. https://doi.org/10.3390/ma13051065
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