Electrochemical behaviour of Ti-Ni SMA and Co-Cr alloys in dynamic Tyrode's simulated body fluid.
The electrochemical behaviour of Ti-Ni shape memory alloy and Co-Cr alloys were investigated in dynamic Tyrode's simulated body fluid on a Model CP6 Potentiostat/Galvanostat. The results indicated that, for all alloys, the anodic dissolution and the pitting sensitivity increased with the flow rate of the Tyrode's solution increasing while the open-circuit potentials and pitting corrosion potentials decreased with the Tyrode's solution increasing. Pitting corrosion of Ti-Ni alloy was easier than Co-Cr alloys. Since the solution's flow enhanced oxygen transform and made it easy to reach the surface of electrodes, the plateau of oxygen diffusion control was diminished. All these indicated that the cathodic reduction and the corrosion reaction, which was controlled by the electrochemical mass transport process, were all accelerated in dynamic Tyrode's simulated body fluid.
Liang
Chenghao
C
Department of Materials Science and Engineering, Dalian Maritime University, Dalian, 116026, China. liangch@dlmu.edu.cn
Zheng
Runfen
R
Huang
Naibao
N
Wu
Bo
B
D000497:Alloys / Q000737:chemistry*; D001826:Body Fluids / Q000737:chemistry*; D003343:Corrosion; D004566:Electrodes; D007552:Isotonic Solutions; D009532:Nickel; D014025:Titanium
D000497:Alloys; D007552:Isotonic Solutions; C037692:Tyrode's solution; C040654:titanium nickelide; D009532:Nickel; D014025:Titanium