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Electrochemical and morphological analysis of corrosion behavior of the brake pad/disc system for automotive applications.

Ludovico Albanese

Electrochemical and morphological analysis of corrosion behavior of the brake pad/disc system for automotive applications.

Rel. Marco Actis Grande, Mario Rosso. Politecnico di Torino, Corso di laurea magistrale in Ingegneria Dei Materiali, 2019


Corrosion has always been one of the biggest problems related to the automotive sector as well as one of the most difficult to approach. The braking system is also affected by corrosive phenomena, not so much during the running rather during the long exposure to atmospheric agents with the vehicle stopped. In this situation the corrosion products of the disk tend to fill the porosity of the pad making it adhere to the surface of the cast iron. In this case the braking system must be completely replaced. In order to avoid these drawbacks, in this thesis a experimental method, in an electrochemical cell, has been perfected. This test allow us to predict the stiction behavior of various types of pads reducing considerably the evaluation time from three weeks to 24 hours, of which only five hours in the electrochemical cell. In particular, in order to improve the test, three known stiction behavior compounds were tested. The results, following numerous improvements, were immediately satisfactory with a considerable increase in the reproducibility of the breakaway values. Subsequently, numerous characterization tests were carried out on the pads and discs used, both at the beginning and at the end of the test, such as: optical microscope analysis, SEM, XRD, laser profilometry, corrosion rate test, tests in climatic chambers, etc. These analysis have led to the formulation of new and original hypotheses on the causes and mechanisms that regulate the phenomenon of stiction but in the same way they have refuted previously formulated hypotheses. This allowed the identification of new possible strategies in order to reduce the risk of stiction.

Relators: Marco Actis Grande, Mario Rosso
Academic year: 2019/20
Publication type: Electronic
Number of Pages: 121
Additional Information: Tesi secretata. Fulltext non presente
Corso di laurea: Corso di laurea magistrale in Ingegneria Dei Materiali
Classe di laurea: New organization > Master science > LM-53 - MATERIALS ENGINEERING
Aziende collaboratrici: ITT ITALIA SRL
URI: http://webthesis.biblio.polito.it/id/eprint/13008
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