Electrochemical behavior of
Ti-Ni shape memory alloy in fibrinogen solution①
Ti-Ni shape memory alloy in fibrinogen solution①
(1.School of Chemical Engineering, Dalian University of Technology, Dalian 116012, China;
2.State Key Laboratory for Corrosion and Protection, Shenyang 110016, China)
2.State Key Laboratory for Corrosion and Protection, Shenyang 110016, China)
Abstract: Electrochemical behaviors of Ti-Ni shape memory alloy in fibrinogen solution were studied by electrochemical techniques. The results indicate that the addition of the fibrinogen has no obvious effect on the corrosion potential, but decreases the pitting potential markedly and increases the passive current densities. The analysis of energy-dispersive X-ray for samples adsorbing fibrinogen exhibits that the elements of O, C and N exist on the surface of Ti-Ni alloy. Furthermore, the scanning electron microscope micrographs confirm that the configuration of the adsorbing fibrinogen concentrating on surface defects is like cluster and the fibrinogen adsorption concentration is 96.67 mg/m2through ultroviolet ray absorption method. Fibrinogen combined with Ti-Ni alloy surface by complex band and its electrochemical transfer accelerated the corrosion of alloy.
Key words: Ti-Ni shape memory alloy; fibrinogen; electrochemical behavior; adsorption