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Rust is not a Must. Improvement of Discs Corrosion Resistance by Tuning of Cast Iron Alloying Elements and Microstructure.
ISSN: 0148-7191, e-ISSN: 2688-3627
To be published on October 05, 2020 by SAE International in United States
In the last decade, the increasing electrification of road transports has stimulated the look for new braking systems with a high corrosion resistance. This resulted in a fervent research activity behind the development of disc brakes with a reduced corrodibility under demanding tribocorrosive environments. Despite of this, a significant reduction of the cast iron disc corrodibility can be achieved not only by developing variously coated rotors, but also by modulating the intrinsic corrodibility of iron. This can be done by and ad-hoc refining of the cast iron: a) alloying elements concentration; b) microstructure; and c) carbon content and morphology. At this regard, in this contribution, the corrosion properties of a representative ensemble of cast iron specimens are reviewed. Voltammetry, elemental and metallographic techniques are used in order to elucidate the interplay existing between electrochemical and metallurgical properties, with particular reference to corrodibility, alloying elements and microstructures. Key points regarding the corrodibility of cast irons are identified, thus paving the way for the development of future rotors with enhanced electrochemical performance and prolonged life.