Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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Investigation of Functional 6061 Aluminum Alloy Oxide Film with Anodization Voltage and its Corrosion Resistance

  • Jisoo Kim (Department of Advanced Materials Engineering, Dong-eui University) ;
  • Chanyoung Jeong (Department of Advanced Materials Engineering, Dong-eui University)
  • Received : 2023.10.14
  • Accepted : 2023.11.11
  • Published : 2023.12.29
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Abstract

This study investigated the formation of oxide films on 6061 aluminum (Al) alloy and their impacts on corrosion resistance efficiency by regulating anodization voltage. Despite advantageous properties inherent to Al alloys, their susceptibility to corrosion remains a significant limitation. Thus, enhancing corrosion resistance through developing protective oxide films on alloy surfaces is paramount. The first anodization was performed for 6 h with an applied voltage of 30, 50, or 70 V on the 6061 Al alloy. The second anodization was performed for 0.5 h by applying 40 V after removing the existing oxide film. Resulting oxide film's shape and roughness were analyzed using field emission-scanning electron microscopy (FE-SEM) and atomic force microscopy (AFM). Wettability and corrosion resistance were compared before and after a self-assembled monolayer (SAM) using an FDTS (1H, 1H, 2H, 2H-Perfluorodecyltrichlorosilane) solution. As the first anodization voltage increased, the final oxide film's thickness and pore diameter also increased, resulting in higher surface roughness. Consequently, all samples exhibited superhydrophilic behavior before coating. However, contact angle after coating increased as the first anodization voltage increased. Notably, the sample anodized at 70 V with superhydrophobic characteristics after coating demonstrated the highest corrosion resistance performance.

Keywords

Acknowledgement

The authors thank Subin Park, a student at Dong-eui University, for helping with the experiment.

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