A Case Study of Thermodynamics and Electrochemical Corrosion Behaviorof Al 6061-T6
Main Article Content
Abstract
Aluminum alloy 6061-T6 is now gaining interest from industries. It is known that T6 heat treatment process induced the presence of Mg2Si particles. The uniform distribution and size of these particles are responsible for the improved mechanical properties. However, the presence of these particles may also produce the local galvanic corrosion between the particles and aluminum matrix. Thus, the electrochemical corrosion behavior of this aluminum alloy is of great interest for industries, particularly marine industries. This case study provides insight in the thermodynamics corrosion of pure aluminum and then offers the preliminary study on the electrochemical corrosion of aluminum in the artificial marine solution using a polarization curve technic and an electrochemical impedance spectroscopy (EIS). The study shows that the passive film mainly composed of Al(OH)3 can be formed on the substrate of aluminum, enhancing the corrosion resistance in a pH range of 5.7-8.5. Polarization curve results show that the presence of chloride ions attacks the passive film, promoting the pitting corrosion. EIS results display that the destruction of passive film can lead to a significantly increased corrosion rate of aluminum 6061-T6. The calculation based on Gibbs free energy pointed out that the localized corrosion of aluminum 6061-T6 can be initiated from the electrochemical potential difference between Mg2Si particles and aluminum matrix. Mg can be dissolved, leading to the onset of the localized corrosion.
Article Details
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
The content and information in articles published in the Journal of Advanced Development in Engineering and Science are the opinions and responsibility of the article's author. The journal editors do not need to agree or share any responsibility.
Articles, information, content, etc. that are published in the Journal of Advanced Development in Engineering and Science are copyrighted by the Journal of Advanced Development in Engineering and Science. If any person or organization wishes to publish all or any part of it or to do anything. Only prior written permission from the Journal of Advanced Development in Engineering and Science is required.
References
Aruri, D., et al (2013). Wear and mechanical properties of 6061-T6 aluminum alloy surface hybrid composites [(SiC + Gr) and (SiC + Al2O3)] fabricated by friction stir processing. Journal of Materials Research and Technology, 2(4), 362-369.
Phiphathatthakul, M., et al (2023). A Study of Heat Transfer Characteristics of Double Pipe Heat Exchanger with Twisted Tape Inserts. Journal of Advanced Development in Engineering and Science, 3(6), 1-10. (in Thai)
Chowwanonthapunya, T., et al (2018). Predictive approach for corrosion study of low alloy steel in a simulated coastal atmosphere. Journal of Science and Technology Mahasarakham University, 37(1), 108-112. (in Thai)
Peeratatsuwan, C., et al. (2022). A Thermodynamic Investigation on Corrosion of Cu-bearing Steel in Aqueous Solutions. Journal of Advanced Development in Engineering and Science, 12(33), 16-26.
Sekularac, G., et al. (2018). Corrosion of aluminum alloy AlSi7Mg0.3 in artificial sea water with added sodium sulphide. Corrosion Science, 144, 54-73.
Yang, X. K., et al. (2017). Properties degradation and atmosphericcorrosion mechanism of 6061 aluminum alloy in industrial and marine atmosphere environments. Materials and Corrosion, 68(5), 529-535.
Luo, D., et al. (2022). Corrosion resistance of 6061-T6 aluminum alloy and its feasibility of near-surface reinforcements in concrete structure. Reviews on Advanced Materials Science, 61, 638-653.
Liang, M., et al. (2018). Corrosion and pitting of 6060 series aluminum after 2 years
exposure in seawater splash,tidal and immersion zones. Corrosion Science, 140, 286-296.
Chowwanonthapunya, T., et al ( 2015). Review of Corrosion of Carbon Steel in CO2 –
Containing Environment of the Oil and Gas Industry: Mechanism Understanding to
Prediction Model. Journal of Advanced Development in Engineering and Science, 5(14), 31-41. (in Thai)
Pourbaix, M. (1990). Thermodynamics and Corrosion. Corrosion Science, 30(10), 963-988.
Chowwanonthapunya, T. (2022). Fundamentals of Corrosion Engineering. Chiangmai: Chiang Mai University Press. (in Thai)
McCafferty, E. (2010). Introduction to Corrosion science. New York: Springer.
Pourbaix, M.(1973). Lectures on Electrochemical Corrosion. New York: Plenum Press.
Can, P., et al. (2022). The corrosion behavior of the 6061 Al alloy in simulated Nansha marine atmosphere. Journal of Materials Research and Technology, 19, 709-721.