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.
Highlights
IntroductionTitanium and its alloys are widely used as biomaterials due to their superior mechanical properties [2,3,4,5]
Titanium has been used in dentistry for more than half a century [1]
The maximum activationwere peaks in commercially pure titanium (CP-Ti) were higher in titanium alloys containing 20 mass% chromium (Ti-20Cr) increasing behaviors different
Summary
Titanium and its alloys are widely used as biomaterials due to their superior mechanical properties [2,3,4,5] The advantages of these materials include excellent biocompatibility, corrosion resistance, and low metal hypersensitivity compared with other metals [3,4]. Commercially pure titanium (CP-Ti) and Ti-6Al-4V are primarily used in dental implant treatments [2] The application of these materials will increase in the future because of the increasing patients’ demands for dental implants to reconstruct their oral function due to missing teeth [5,6,7]. The primary cause of these corrosion behaviors is destruction of the passive film in the presence of fluorides or peroxides
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