Corrosion Behavior of Titanium in Artificial Saliva by Lactic Acid

Materials

Qing Qu²  Lei Wang²  Yajun Chen²  Lei Li¹  Yue He² 

[1] Laboratory for Conservation and Utilization of Bio-Resources, Yunnan University, Kunming 650091, China; E-Mail:;School of Chemical Science and Technology, Yunnan University, Kunming 650091, China; E-Mails:

关键词: corrosion;    titanium;    artificial saliva;    lactic acid;    corrosion mechanism;   

DOI  :  10.3390/ma7085528

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2014 by the authors; licensee MDPI, Basel, Switzerland.