Electrochemical passive properties of AlxCoCrFeNi (x = 0, 0.25, 0.50, 1.00) alloys in sulfuric acids |
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| Authors: | Yih-Farn Kao Swe-Kai Chen Yee-Shyi Chang |
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| Affiliation: | a Department of Materials Science and Engineering, National Tsing Hua University, 101 Kuang Fu Road, Sec. 2, Hsinchu 30013, Taiwan, ROC
b Center for Nanotechnology, Materials Science, and Microsystems, National Tsing Hua University, 101 Kuang Fu Road, Sec. 2, Hsinchu 30013, Taiwan, ROC |
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| 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. |
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| Keywords: | A Alloy B EIS B Polarization B Weight loss C Passive films |
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