| Pacific Rim Symposium on Surfaces, Coatings and Interfaces (PacSurf 2016) | |
| Thin Films | Tuesday Sessions |
| Session TF-TuP |
| Session: | Thin Films Poster Session |
| Presenter: | Kaiqiang Zhang, Kyungpook National University, Korea, Republic of Korea |
| Authors: | K.Q. Zhang, Kyungpook National University, Korea, Republic of Korea S.S. Park, Kyungpook National University, Korea, Republic of Korea |
| Correspondent: | Click to Email |
ZrO2-Al2O3 composite oxide films are promising dielectric material for future use in aluminum electrolytic capacitors. The films were prepared on etched Al foils by ZrO2 coating and anodizing. The anodizing of Al foils has been carried out generally in aqueous boric acid solution. But when Al foils are anodized above about 700V, boric acid solution is not suitable as electrolyte due to severe O2 evolution. In this study, we used borate polyester solution as electrolyte to inhibit the O2 evolution, and discussed the effects of the borate polyester concentration on anodizing behaviors and electrical properties of the ZrO2 coated Al foils. The results show that borate polyester electrolyte can effectively inhibit the O2 evolution during anodizing, and increase the withstanding voltage of the samples. The specific capacitance of the samples decreases with the increasing of borate polyester concentration. Compared to anodization in boric acid electrolyte, the use of borate polyester electrolyte led to increases in the specific capacitance of 25.9 % for 700 V, 15.6 % for 800 V and 8.9 % for 900 V.