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| THE ANODIC BEHAVIOR OF TITANIUM IN H_3PO_4, H_2SO_4 AND HCl SOLUTION |
| Chen Kunyao Lin Zhonghua and Tian Zhaowu (Xiamen University) |
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Abstract The anodie behavior of Ti in H_3PO_4, H_2SO_4 and HCl solutions has been studied by steady state and transient electrochemical techniques and XPS technique. The experimental results are as follows. (1) The titanium hydride TiH is detected from the XPS of titanium electrode self-activated in these solutions, and it is proposed that the atomic hydrogen formed in self-activation process diffuses into the titanium metal lattice and partially forms titanium hydride. (2)Thesecond anodic peak, which is not found in steady-state polarization curve, appears in volatmmogram at about-0.12V and is assigned to the oxidation of atomic hydrogen. The oxidizing process is controlled by the diffusion of atomic hydroogen in titanium metal lattice as evidenced by the fact that the peak current is propotional to v~(1'2). Therefore, the Kelly's mechanism of the anodic tprocess of titanium in these solutions must be modified by considering vhe formation and oxidation of atomic hydrogen. The AC impedances erify this conclusion qualitatively.
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Received: 25 June 1989
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