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Sticking Phenomena at the Brake Pad – Disc Interface: An Open Call for Electrochemists

Picture for Sticking Phenomena at the Brake Pad – Disc Interface: An Open Call for Electrochemists
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Product Number: 51321-16429-SG
Author: Marco Bandiera
Publication Date: 2021
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The work reports for the first time galvanic current measurements for the friction material - cast iron couple. In particular, three friction materials are investigated with respect to a reference grey cast iron. Measurements are performed using Zero Resistance Ammeter (ZRA) –based techniques and voltammetry methods. Discussion of the results allows to investigate the interplay existing between galvanic couplings and growth of corrosion products at the interface between braking pad and cast iron disc. The effects of several physico-chemical properties of friction materials, such as their composition and wettability, are discussed as well. It is demonstrated that the presence of selected elements in the composition of friction materials (e.g. Zn, Fe and Cu) and the pad wettability are strongly modulating the galvanic current trend over time and play a major role on the corrosion scale growth at the pad-disc interface and the associated sticking effect.

Key words: Braking system, Friction material, Cast iron, Galvanic current, ZRA methods

The work reports for the first time galvanic current measurements for the friction material - cast iron couple. In particular, three friction materials are investigated with respect to a reference grey cast iron. Measurements are performed using Zero Resistance Ammeter (ZRA) –based techniques and voltammetry methods. Discussion of the results allows to investigate the interplay existing between galvanic couplings and growth of corrosion products at the interface between braking pad and cast iron disc. The effects of several physico-chemical properties of friction materials, such as their composition and wettability, are discussed as well. It is demonstrated that the presence of selected elements in the composition of friction materials (e.g. Zn, Fe and Cu) and the pad wettability are strongly modulating the galvanic current trend over time and play a major role on the corrosion scale growth at the pad-disc interface and the associated sticking effect.

Key words: Braking system, Friction material, Cast iron, Galvanic current, ZRA methods

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