Investigation of the corrosion performance of friction materials (FMs) plays a central role in: a) evaluating the corrosion resistance of braking pads [1]; b) elucidating galvanic couplings among different braking system components [2]; c) designing FMs with a negligible sticking effect upon coupling with a cast iron brake disc [3]. Corrosion performance can be evaluated by measuring proper electrochemical figures of merit [4] such as the: 1) corrosion potential (Ecorr); 2) corrosion current (Icorr); and 3) galvanic current (Igc); in agreement with a suitable test specification. Nevertheless, particular attention should be paid when measuring these quantities since several experimental details can lead to inaccurate or misleading results. At this regard, the work clarifies the effect of several test parameters (e.g. scan rate, stabilization time, potential ranges, etc.) on the measure of the corrodibility of a reference friction material. Most common errors and their effect on the electrochemical figures of merit are discussed, with the final aim of providing a solid guideline for designing braking pads with a reduced corrodibility. References:[1] Bertasi, F., Mancini, A., Bandiera, M., Pin, S., Casini, A., Bonfanti, A., “Interplay between Composition and Electrochemical Performance at the Pad-Disc Interface”, EUROBRAKE, Manuscript no. EB2019-MDS-018 (Stansted, UK: FISITA, 2019), p. 1.[2] Bertasi, F., Bandiera, M., Bonfanti, A., “Toward a Corrosion Proof Braking System”, SAE Technical Paper, Manuscript no. 2020-01-1625, 2020.[3] Bandiera, M., Mancini, A., Bonfanti A., Pavesi, A., Pin S., Bertasi, F. “Sticking Phenomena at the Brake Pad – Disc Interface: An Open Call for Electrochemists”, CORROSION/21, Manuscript no. C2021-16429, 2021. (under review).[4] Bandiera, M., Pin, S., Bonfanti, A., Bertasi, F., Mancini, A., “Physico-Chemical Characterization of Corrosion Scales in Braking Systems”, CORROSION/20, Manuscript no. C2020-14687, 2020.
"Top-notch disc brake systems typically include components which are designed using aluminium/silicon alloys. The corrosion resistance of such materials, while immersed in brake fluids, is only barely investigated in the literature, and regards only very few and case-specific examples. Following this, the manuscript investigates the corrosion resistance of a 42200 aluminium/silicon alloy in different brake fluids (BFs). In particular, five brake fluids comprising an increasing amount of water are investigated. Results are discussed in terms of corrosion potential (Ecorr) and corrosion current (Icorr) values of the alloy, as obtained from linear sweep voltammetry measurements. The suggested lab-scale approach is aimed at: a) proposing a preliminary investigation regarding the corrosivity of different BFs; and b) simulating the effect of the brake fluid ageing (e.g., increasing amount of water) on the corrosion resistance of the investigated 42200 alloy. It is demonstrated that the corrosion resistance of 42200 is strongly modulated by: a) the nature of the brake fluid in which it is immersed; and b) the amount of water comprised in each BF. Insights regarding the minimum amount of water which is necessary to modulate the electrochemical performance of each BF are proposed as well. "
<div class="section abstract"><div class="htmlview paragraph">The work investigates the use of cathodic protection -based strategies (e.g. sacrificial anodes) with the aim of extending the corrosion resistance of Aluminum components to be used in disc brake systems. Lab-scale electrochemical measurements, including voltammetry and zero resistance ammetry (ZRA), are used to: a) define the requirements of a cathodic protection system for a 42200 Aluminum alloy; b) evaluate the protection capability of a Zn-based sacrificial anode; and c) demonstrate an extended corrosion resistance of the protected part even in the presence of a galvanic coupling, with respect to the unprotected condition.</div></div>
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