Journal
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
Volume 28, Issue 3, Pages 1456-1468Publisher
SPRINGER
DOI: 10.1007/s11665-019-03930-6
Keywords
adhesion; Hanks' balanced salt solution; Mott-Schottky; passive layer; titanium boride
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Funding
- Iran National Science Foundation (INSF) [95841122]
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In this study, in order to evaluate the electrochemical performance of different titanium boride coatings created on the commercially pure titanium (CP-Ti), distinct electrochemical assays in Hanks' balanced salt solution at 37 degrees C were conducted using pack cementation method. The results showed that the boriding at 900 and 1000 degrees C for 3 h creates the TiB whiskers and TiB whiskers/TiB2 dense layer on the top of the commercially pure titanium surface, respectively. It was also found that not only borides coating had good adhesion on the substrate, but also that improved the titanium hardness more than five times. Polarization plots clarified the passive behavior of borided specimens. Impedance spectroscopy tests indicated the acceptable corrosion behavior of the borided specimens in Hanks' balanced salt solution. Mott-Schottky measurements indicated that the passive layers formed on the commercially pure titanium and the borided specimens had doped n-type semiconductor properties. Mott-Schottky measurements displayed that the donor density of the passive layers decreased with the rising time as well. Finally, because of better surface conditions to make a less defective and more protective passive layer, the borided specimen at 900 degrees C in comparison with the borided specimen at 1000 degrees C was shown to be the more suitable choice for bioimplant applications.
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