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Corrosion Behavior of Titanium in Artificial Saliva by Lactic Acid

1
School of Chemical Science and Technology, Yunnan University, Kunming 650091, China
2
Laboratory for Conservation and Utilization of Bio-Resources, Yunnan University, Kunming 650091, China
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Author to whom correspondence should be addressed.
Materials 2014, 7(8), 5528-5542; https://doi.org/10.3390/ma7085528
Received: 14 April 2014 / Revised: 30 June 2014 / Accepted: 23 July 2014 / Published: 28 July 2014
As one of the main products produced by oral microorganisms, the role of lactic acid in the corrosion of titanium is very important. In this study, the corrosion behavior of titanium in artificial saliva with and without lactic acid were investigated by open-circuit potentials (OCPs), polarization curves and electrochemical impedance spectroscopy (EIS). OCP firstly increased with the amount of lactic acid from 0 to 3.2 g/L and then tended to decrease from 3.2 to 5.0 g/L. The corrosion of titanium was distinctly affected by lactic acid, and the corrosion rate increased with increasing the amount of lactic acid. At each concentration of lactic acid, the corrosion rate clearly increased with increasing the immersing time. Results of scanning electron microscopy (SEM) also indicated that lactic acid accelerated the pitting corrosion in artificial saliva. A probable mechanism was also proposed to explain the experimental results. View Full-Text
Keywords: corrosion; titanium; artificial saliva; lactic acid; corrosion mechanism corrosion; titanium; artificial saliva; lactic acid; corrosion mechanism
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Qu, Q.; Wang, L.; Chen, Y.; Li, L.; He, Y.; Ding, Z. Corrosion Behavior of Titanium in Artificial Saliva by Lactic Acid. Materials 2014, 7, 5528-5542.

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