Changes in the Structure and Corrosion Protection Ability of Porous Anodic Oxide Films on Pure Al and Al Alloys by Pore Sealing Treatment
Abstract
:1. Introduction
2. Experimental
3. Results
3.1. Growth of Anodic Oxide Films on Pure Al and Al Alloys during Anodizing
3.2. Surface Morphology Change of Pure Al and Al Alloys by Pore Sealing
3.3. Corrosion Protection of Pure Al and Al Alloys after Anodizing and Pore Sealing
4. Discussion
4.1. Mechanism on the Growth of Anodic Oxide Films during Anodizing of Pure Al and Al Alloys
4.2. Structural Change of Anodic Oxide Films during Pore Sealing
4.3. Corrosion Protection Change by Pore Sealing
5. Conclusions
- (1)
- Pure Al after anodizing for 1800 and 3600 s has uniform porous oxide films with a smooth surface, but 1050-, 3003- and 5052-Al alloys have porous oxide films with imperfections, including pits and cavities.
- (2)
- Pore sealing in boiling water leads to the formation of hydro-oxy-oxides in nano-pores of the porous oxide film uniformly on pure Al, and leads to the formation of cracks on the Al alloys.
- (3)
- The total areas of cracks exposed increases with anodizing time on all Al alloys, and this is more remarkable in the order of 3003-Al alloy > 5052-Al alloy > 1050-Al alloy.
- (4)
- The value of Rc, evaluated by electrochemical impedance spectroscopy in 2 kmol m−3 -NaCl solution, increases with anodizing time on pure Al, and only slightly increases on Al alloys.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
Appendix A
References
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Thickness of Specimen/mm | Components | |||||||||
---|---|---|---|---|---|---|---|---|---|---|
Si | Fe | Cu | Mn | Mg | Zn | Cr | Ti | Al | ||
Pure Al | 0.50 | 0.01 | 0.00 | 0.01 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | Balance |
1050-Al | 0.30 | 0.10 | 0.36 | 0.02 | 0.00 | 0.00 | 0.01 | 0.00 | 0.00 | Balance |
3003-Al | 0.28 | 0.27 | 0.57 | 0.14 | 1.19 | 0.00 | 0.03 | 0.00 | 0.00 | Balance |
5052-Al | 0.97 | 0.10 | 0.10 | 0.02 | 0.04 | 2.59 | 0.01 | 0.20 | 0.01 | Balance |
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Yanagimoto, H.; Saito, K.; Takahashi, H.; Chiba, M. Changes in the Structure and Corrosion Protection Ability of Porous Anodic Oxide Films on Pure Al and Al Alloys by Pore Sealing Treatment. Materials 2022, 15, 8544. https://doi.org/10.3390/ma15238544
Yanagimoto H, Saito K, Takahashi H, Chiba M. Changes in the Structure and Corrosion Protection Ability of Porous Anodic Oxide Films on Pure Al and Al Alloys by Pore Sealing Treatment. Materials. 2022; 15(23):8544. https://doi.org/10.3390/ma15238544
Chicago/Turabian StyleYanagimoto, Haruno, Koki Saito, Hideaki Takahashi, and Makoto Chiba. 2022. "Changes in the Structure and Corrosion Protection Ability of Porous Anodic Oxide Films on Pure Al and Al Alloys by Pore Sealing Treatment" Materials 15, no. 23: 8544. https://doi.org/10.3390/ma15238544