| Autor: |
ZHANG Liu-yan, MA Ai-bin, JIANG Jing-hua, YU Hai-bin, WU Hui-shu |
| Jazyk: |
čínština |
| Rok vydání: |
2016 |
| Předmět: |
|
| Zdroj: |
Cailiao gongcheng, Vol 44, Iss 11, Pp 66-72 (2016) |
| Druh dokumentu: |
article |
| ISSN: |
1001-4381 |
| DOI: |
10.11868/j.issn.1001-4381.2016.11.011 |
| Popis: |
In order to guide a reasonable application of the bulk ultrafine-grained industrial pure iron, a serious of ultrafine-grained pure iron samples with different microstructures were fabricated by multi-passes ECAP and heat-treatment, and their microstructures and pitting corrosion behaviour were investigated by transmission electron microscopy (TEM), electrochemical polarization and impedance spectroscopy (EIS) techniques, respectively. Results show that:with the increase of ECAP passes, lath-shaped structure with high dislocation density transforms into equiaxed grains with low dislocation density; the dislocation density decreases and the high-angle grain boundaries increase, after the annealing treatment. ECAP passes have less effect on the self-passivation of pure iron, and its open circuit potential (OCP) and polarization resistance are less changed; the pitting corrosion resistance of the ECAPed pure iron is related to the ECAP passes:the pitting potential first decreases and then increases with the increase of ECAP passes; the self-passivation property and pitting corrosion resistance of the ECAPed pure iron are improved after the annealing heat-treatment, the OCP, polarization resistance and pitting potential values increase obviously. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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