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Effect of Pb-underpotential deposition on anodic dissolution and passivation of pure Fe and Fe-Ni alloys in acidic perchlorate solution
| Title: | Effect of Pb-underpotential deposition on anodic dissolution and passivation of pure Fe and Fe-Ni alloys in acidic perchlorate solution |
| Authors: | Seo, Masahiro Browse this author →KAKEN DB | | Habazaki, Hiroki Browse this author | | Nakayama, Takenori Browse this author |
| Keywords: | Pure Fe | | Fe-Ni alloy | | Underpotential deposition (UPD) of Pb | | Anodic dissolution | | Passivation |
| Issue Date: | Nov-2016 |
| Publisher: | Springer |
| Journal Title: | Journal of Solid State Electrochemistry |
| Volume: | 20 |
| Issue: | 11 |
| Start Page: | 3133 |
| End Page: | 3142 |
| Publisher DOI: | 10.1007/s10008-016-3210-y |
| Abstract: | The potentio-dynamic polarization curves of pure Fe, Fe-30 Ni, and Fe-70 Ni alloys in acidic perchlorate solutions (pH 1.9) without and with 10(-3) M Pb2+ were measured to investigate the effect of Pb-underpotential deposition (Pb-UPD) on anodic dissolution and passivation in relation to Pb-induced stress corrosion cracking (Pb-SCC) of Ni base alloys. The addition of 10(-3) M Pb2+ shifts the open circuit potentials of pure Fe and Fe-Ni alloys toward noble direction to inhibit the anodic dissolution and promote the passivation, which results from Pb-UPD on substrate metals. The electro-desorption of Pb proceeds with anodic potential sweep and the anodic dissolution is enhanced when the surface coverage of Pb is reduced to a critical level. Tafel slopes (b (+) = 8.5 similar to 15 mV decade(-1)) of anodic dissolution for pure Fe and Fe-Ni alloys in the presence of Pb2+ are significantly low as compared with those (b (+) = 34 similar to 40 mV decade(-1)) in the absence of Pb2+, which reflects on the rapid enhancement in surface reactivity as a result of electro-desorption of Pb. It is found that the potential region in which anodic dissolution is inhibited by Pb-UPD is located within the potential window of Pb-UPD estimated from the differences in work-function between substrate metals and Pb. |
| Rights: | The final publication is available at Springer via http://dx.doi.org/10.1007/s10008-016-3210-y |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/67495 |
| Appears in Collections: | 総合化学院 (Graduate School of Chemical Sciences and Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 瀬尾 眞浩
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