The manuscript proposes an advanced study of the corrosion resistance of anodic layers obtained by anodizing different Aluminum/Silicon (AlSi) alloys, typically used in the manufacturing of braking systems. Metallography, scanning electrochemical microscopy (SECM) measurements and electrochemical noise (EN) -based methods allow to depict the complex interplay between the microstructure of each investigated alloy and their corrosion resistance after anodizing. It is demonstrated that a high Silicon concentration in pristine alloys can: a) modulate the impedance of the obtained anodic layers; and b) generate local thickness variations of the coatings with an associated reduction of the corrosion resistance. In addition, electrochemical noise measurements (ENM) demonstrate that the corrosion resistance and anodizability of the proposed materials follow the order EN AW-6082 > EN AC-42200 > EN AC-43200.
Daga, M., Valota, G., Abello, M., Bonfanti, A., Pavesi, A., Mancini, A., et al. (2024). Recent Progress in Corrosion Protection of Braking Systems. In AMPP Annual Conference and Expo 2024. Association for Materials Protection and Performance.
Recent Progress in Corrosion Protection of Braking Systems
Mancini A.;
2024
Abstract
The manuscript proposes an advanced study of the corrosion resistance of anodic layers obtained by anodizing different Aluminum/Silicon (AlSi) alloys, typically used in the manufacturing of braking systems. Metallography, scanning electrochemical microscopy (SECM) measurements and electrochemical noise (EN) -based methods allow to depict the complex interplay between the microstructure of each investigated alloy and their corrosion resistance after anodizing. It is demonstrated that a high Silicon concentration in pristine alloys can: a) modulate the impedance of the obtained anodic layers; and b) generate local thickness variations of the coatings with an associated reduction of the corrosion resistance. In addition, electrochemical noise measurements (ENM) demonstrate that the corrosion resistance and anodizability of the proposed materials follow the order EN AW-6082 > EN AC-42200 > EN AC-43200.
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