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Materials 2017, 10(2), 194; doi:10.3390/ma10020194

Fretting Corrosion Behavior of Experimental Ti-20Cr Compared to Titanium

1
Section Medical Materials Science & Technology, University Hospital Tübingen, Osiander Strasse 2-8, Tübingen 72076, Germany
2
Department of Prosthodontics, Center of Dentistry, Oral Medicine, and Maxillofacial Surgery, University Hospital Tübingen, Osianderstrasse 2-8, Tübingen 72076, Germany
*
Author to whom correspondence should be addressed.
Academic Editor: Daniel J. Blackwood
Received: 19 January 2017 / Revised: 13 February 2017 / Accepted: 14 February 2017 / Published: 17 February 2017
(This article belongs to the Special Issue Passive Oxide Films and Their Susceptibility to Corrosion)
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Abstract

Experimental cast titanium alloys containing 20 mass% chromium (Ti-20Cr) show preferable mechanical properties and a good corrosion resistance. This study evaluated the fretting corrosion behavior of Ti-20Cr. Ti-20Cr (n = 4) and commercially pure titanium (CP-Ti, n = 6) disk specimens were used. The fretting corrosion test was performed by electrochemical corrosion at 0.3 V in 0.9% saline solution and mechanical damage using 10 scratching cycles with three different scratching speeds (10–40 mm/s) at 10 N. After testing, the activation peak, repassivation time and surface morphology of each specimen were analyzed. The differences between the results were tested by parametric tests (α = 0.05). The average activation peaks were significantly higher in CP-Ti than in Ti-20Cr (p < 0.01), except at 20 mm/s. In the series of scratching speeds, faster scratching speeds showed higher activation peaks. The maximum activation peaks were also higher in CP-Ti. Slight differences in the repassivation time were observed between the materials at every scratching speed; faster scratching speeds showed shorter repassivation times in both materials (p < 0.05). CP-Ti showed severe damage and significantly higher wear depth than Ti-20Cr (p < 0.05). In conclusion, adding chromium to titanium reduced surface damage and improved the fretting corrosion resistance. View Full-Text
Keywords: titanium; titanium alloys containing chromium; Ti-20Cr; fretting corrosion test; passive oxide film; repassivation time; scratching titanium; titanium alloys containing chromium; Ti-20Cr; fretting corrosion test; passive oxide film; repassivation time; scratching
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Sawada, T.; Schille, C.; Almadani, A.; Geis-Gerstorfer, J. Fretting Corrosion Behavior of Experimental Ti-20Cr Compared to Titanium. Materials 2017, 10, 194.

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