Electrochemical characterization of Ti12Mo5Ta alloys in contact with saline medium

作     者：Daniel MARECI Romeu CHELARIU Adrian CAILEAN Florin BRINZA Georgiana BOLAT Doina Margareta GORDIN 

作者机构：Faculty of Chemical Engineering and Environmental ProtectionGheorghe Asachi Technical University of Iasi Faculty of Materials Science and EngineeringGheorghe Asachi Technical University of Iasi Faculty of Physics Alexandru Ioan Cuza University of Iasi INSA Rennes UMR CNRS 6226 Sciences Chimiques de Rennes/Chimie-Métallurgie F-35043Rennes Cedex France 

出 版 物：《Transactions of Nonferrous Metals Society of China》 (中国有色金属学报（英文版）)

年 卷 期：2015年第25卷第1期

页      面：345-353页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：supported by a grant from the Romanian National Authority for Scientific Research  CNCS-UEFISCDI  project number PN-II-ID-PCE-20113-0218 

主　　题：titanium alloys recrystallization anodic potentiodynamic curve Ta Mo electrochemical behavior 

摘      要：The electrochemical behaviours of unrecrystallized and recrystallized Ti12Mo5Ta alloys were compared with those of the unrecrystallized Ti12 Mo alloy and commercial pure titanium（cp-Ti）. Experiments were carried out using physiological 0.9% NaCl solution（pH 2.3） at 37 °C. Very low passive current densities（in order of 10-6 A/cm2） were obtained from the anodic polarization curves, indicating high resistances of all samples in acidified 0.9% Na Cl solution. Scanning electron microscopy（SEM） was employed to observe the surface morphology and all sample surfaces were identically corroded, no pitting, cracks, or other defects appeared on the sample surfaces after anodic potentiodynamic polarization tests. Equivalent circuit was used for modeling the electrochemical impedance spectroscopy（EIS） data, in order to characterize the sample surface and better understand the effect of Mo and Ta addition on the cp-Ti and the effect of recrystallization. The EIS results confirm that all titanium samples exhibit passivity in physiological 0.9% NaCl solution（pH 2.3） at open circuit potential（polarization resistance is around 105 Ω·cm2）. The corrosion resistance of these samples in physiological 0.9% NaCl solution（pH 2.3） at 37 °C is in the following order of recrystallized Ti12Mo5Ta〉 unrecrystallized Ti12Mo5Ta 〉 unrecrystallized Ti12Mo 〉 cp-Ti.