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Brake Pads: Effect Of Galvanic Current On The Corrodibility Of Friction Materials And Backplates

The brake system is a core component of cars, motorbikes, bikes, airplanes etc.. Its main task is to modulate the speed of moving vehicles by converting the kinetic energy into heat.1,2 In the case of modern cars or motorbikes, the speed modulation can be performed by using the so-called disc-brake system.1,2,3,4,5,6 This generates the braking torque by forcing two brake pads against a disc by the means of a caliper.2,3,5,6 In the case of cars, the disc and the caliper are enclosed within each wheel and, as a consequence, can be exposed to corrosion phenomena, mostly related with atmospheric or environmental conditions.1,3,7,8 

Product Number: 51322-17926-SG
Author: Marco Bandiera, Arianna Pavesi, Fabio Manzoni, Bozhena Tsyupa, Andrea Bonfanti, Alessandro Mancini, Federico Bertasi
Publication Date: 2022
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The work reports for the first time galvanic current measurements for the friction material – backplate couple. In particular, two configurations including different friction materials and a steel-based backplate are considered. Measurements are performed using Linear Sweep Voltammetry (LSV) and Zero Resistance Ammeter (ZRA) –based techniques and allow to: 1) investigate the interplay between galvanic currents and localized corrosion events at the interface between each investigated friction material and the corresponding backplate; 2) correlate the corrosion potential of stand-alone materials with that of multilayered specimens; and 3) identify friction materials which show a sacrificial anode behavior with respect to the backplate. 

The work reports for the first time galvanic current measurements for the friction material – backplate couple. In particular, two configurations including different friction materials and a steel-based backplate are considered. Measurements are performed using Linear Sweep Voltammetry (LSV) and Zero Resistance Ammeter (ZRA) –based techniques and allow to: 1) investigate the interplay between galvanic currents and localized corrosion events at the interface between each investigated friction material and the corresponding backplate; 2) correlate the corrosion potential of stand-alone materials with that of multilayered specimens; and 3) identify friction materials which show a sacrificial anode behavior with respect to the backplate. 

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