Electrodeposition of Polypyrrole on Aluminum Alloy 2024: Assessment of the Influence of the Deposition Current
Abstract
One of the main factors that make aluminum 2024 alloys attractive to the aerospace industry is their mechanical strength, which makes them suitable for withstanding significant load demands, such as aircraft structural components. In addition to its mechanical strength, despite being categorized as high-strength, Alloy 2024 is remarkably lightweight compared to other metals, which enhances its use in the automotive and aerospace industries. On the other hand, to utilize this alloy, it is necessary to undergo a chromate process, a surface treatment involving the use of chemical compounds containing chromium in the form of hexavalent ions (Cr6+). While this process effectively improves corrosion resistance and the adherence of coatings on metals, including aluminum alloys, it poses risks to health and the environment, such as toxicity, environmental impact, and regulations and restrictions on its use. Therefore, the importance of studying the electrodeposition of inherently conductive polymers, such as polypyrrole, as an alternative for corrosion protection has been recognized, supported by the results of Tafel curve analyses. The morphological characterization of the coated discs was obtained by Scanning Electron Microscopy and Fourier Transform Infrared Spectroscopy.
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