Journal
CORROSION SCIENCE
Volume 52, Issue 3, Pages 1026-1034Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2009.11.028
Keywords
Alloy; EIS; Polarization; Weight loss; Passive films
Funding
- National Science Council of the Republic of China, Taiwan [NSC96-2221-E007-066-MY3]
- CSC Group Education Foundation of China Steel Corporation
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This study investigates the electrochemical passive properties of AlxCoCrFeNi alloys in H2SO4 by potentiodynamic polarization, EIS, and weight loss tests from 20 to 65 degrees C. Experimental results indicate that Al harms the corrosion resistance in H2SO4 at temperatures exceeding 27 degrees 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 E-a increase with Al content. However, A affects corrosion current density more significantly than E-a at higher temperatures and, conversely, at lower temperatures. (C) 2009 Elsevier Ltd. All rights reserved.
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