| 1 | EFFECT OF SnO_2 ADDITION ON THE SERVICE LIFE AND ELECTROCHEMICAL PROPERTIES OF Ti/IrO_2,+Ta_2O_5 ANODES IN PHENOLSULFONIC ACID SOLUTION显示文摘Service life of two different oxide anodes in phenolsulfonic acid (PSA) solution was investigated by accelerated electrolysis. The durability of Ti/IrO2+Ta2 O5 anode increased by the addition of SnO2 in the mixed oxides. The degradation mechanisms of Ti/IrO2+ Ta2 O5 and Ti/IrO2 +Ta2 O5 +SnO+2 anodes were different. It was shown from the observation of scanning electron microscopy (SEM) and the electrochcmical measurement that, the deactivation of Ti/IrO2 + Ta2 O5 anode was due to the build-up of an organic film on surface. The growth of the covered film on surface was restricted by addition of SnO2, which resulted in increasing of the service life of anodes. The over-potential for oxygen evolution on Ti/IrO2 +Ta2 O5 electrode increased after doping SnO2, and the intermediate products of PSA building-up on the surface was much more rapidly oxidized. Meanwhile, a certain part of the surface oxide deposit entered into the solution leading to loss of oxides, which resulted in degradation of Ti/IroO2 + Ta2 O5 anode containing SnO2 component. | J.M. Hu H.M. Meng D.B. Sun S.J. Zhang J.X. Wu and D.J. Yang Beijing Corrosion and Protection Center, Open Laboratory of Corrosion, Erosion and Surface Technology, University of Science and Technology Beijing, Beijing 100083, China | 2000 | Acta Metallurgica Sinica(English Letters)2000，13，4： | 3 |
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