Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1470314 | Corrosion Science | 2010 | 9 Pages |
Abstract
This study investigates the electrochemical passive properties of AlxCoCrFeNi alloys in H2SO4 by potentiodynamic polarization, EIS, and weight loss tests from 20 to 65 °C. Experimental results indicate that Al harms the corrosion resistance in H2SO4 at temperatures exceeding 27 °C owing to the porous and inferior nature of the protection oxide film of Al in these alloys. Closely examining the Arrhenius plots of corrosion current density reveals that both pre-exponential factor A and activation energy Ea increase with Al content. However, A affects corrosion current density more significantly than Ea at higher temperatures and, conversely, at lower temperatures.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Yih-Farn Kao, Tsung-Dar Lee, Swe-Kai Chen, Yee-Shyi Chang,