Browse Publications Technical Papers 2020-01-1625

Toward a Corrosion Proof Braking System 2020-01-1625

As of today, the corrosion resistance of a braking system is considered as important as the braking performance. This is particularly true when considering the emergent electrification of road transports which requires braking systems with a service life as long as the whole vehicle life [1]. Following this, among brake system manufacturers, the research for corrosion protection strategies is driving the development of new discs and calipers aiming at improving their performance during corrosion (e.g. Neutral Salt Spray Tests) and/or tribo-corrosion tests (e.g. bench testing in corrosive environments). It has been demonstrated [2] that depending on: a) the design of the brake caliper; b) the chosen materials; and c) the adopted protection strategies (painting, anodization, etc.), several galvanic couplings are present within a braking system and could lead to severe corrosive phenomena including pitting and surface diffuse corrosion. In this work, a collection of the electrochemical performance of braking system components is presented and discussed. It will be demonstrated that depending on: a) electrochemical figures of merit (e.g. corrosion potential and corrosion current); b) distance; and c) area of each selected component, it is possible to tune and boost the corrosion resistance of a braking system. The outcome of this work allows to identify key points and guidelines to for the design of future braking systems with an improved corrosion resistance. References: [1] F. Bertasi, A. Mancini, M. Bandiera, S. Pin, A. Casini, A. Bonfanti, “Interplay between Composition and Electrochemical Performance at the Pad-Disc Interface”, EUROBRAKE, paper no. EB2019-MDS-018 (Stansted, UK: FISITA, 2019) [2] M. Bandiera, A. Bonfanti, A. Mauri, A. Mancini, M. Bestetti, F. Bertasi, “Corrosion Phenomena in Braking Systems”, CORROSION/20, paper no. 14680 (Houston, TX: NACE, 2020)


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