Corrosion Stiction in Automotive Braking Systems

• Published in: Materials Vol. 16; no. 10; p. 3710
• Main Authors: Motta, Michele, Fedrizzi, Lorenzo, Andreatta, Francesco
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 13.05.2023; MDPI
• Subjects: Additives; Adhesive strength; Asbestos; Brakes; Braking; braking system; Braking systems; Ceramic fibers; Complexity; Composite materials; Corrosion; Corrosion and anti-corrosives; Decomposition; Electrochemical impedance spectroscopy; Electrode polarization; Friction; friction material; Gray iron; Heat resistance; Iron constituents; Lubricants & lubrication; Moisture absorption; Phenols; Physical properties; Resins; Review; Stiction; Surface treatment; Temperature; corrosion; braking system; friction material; stiction
• ISSN: 1996-1944; 1996-1944
• DOI: 10.3390/ma16103710

This review paper targets the corrosion-stiction phenomenon that can occur in automotive braking systems under static conditions in aggressive environments. The corrosion of gray cast iron discs can lead to a strong adhesion of the brake pad at the pad/disc interface that can impair the reliability and performance of the braking system. The main constituents of friction materials are initially reviewed in order to highlight the complexity of a brake pad. Corrosion-related phenomena, including stiction and stick-slip, are considered in detail to discuss the complex effect of the chemical and physical properties of friction materials on these phenomena. In addition, testing methods to evaluate the susceptibility to corrosion stiction are reviewed in this work. Electrochemical methods, including potentiodynamic polarization and electrochemical impedance spectroscopy, are useful tools for a better understanding of corrosion stiction. The development of friction materials with low susceptibility to stiction should follow a complementary approach targeting an accurate selection of the constituents, control of local conditions at the pad-disc interface, and the use of specific additives or surface treatments to reduce the corrosion susceptibility of gray cast-iron rotors.