Inhibitive effect of 8-hydroxyquinoline on corrosion of gray cast iron in automotive braking systems

Motta, Michele; Zanocco, M.; Rondinella, A.; Iodice, V.; Sin, A.; Fedrizzi, L.; Andreatta, F.

doi:10.1016/j.electacta.2023.142221

Cited by 11 publications

(5 citation statements)

References 34 publications

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“…Electrochemical measurements can be carried out on single components of the braking system, including gray cast-iron rotors, aluminum calipers, and even the friction materials. Open-circuit potential (OCP) and potentiodynamic polarization (also referred to as linear-sweep voltammetry) measurements can provide information on the corrosion potential and corrosion rate of gray cast iron rotors and on the effect of alloying elements on the electrochemical behavior [51,64]. This can be done also for aluminum brake calipers [64].…”

Section: Electrochemical Methodsmentioning

confidence: 99%

“…As a result, the components of the braking systems might undergo corrosion during service. In particular, the brake discs are particularly exposed to corrosion due to the intrinsic low corrosion resistance of the gray cast iron in aggressive environments [ 50 , 51 ]. As discussed above, corrosion affecting the braking system of BEV, HEV, and PHEV vehicles is a critical aspect not only regarding the braking performance but also the emission of particulate matter.…”

Section: Corrosion-related Phenomena In Braking Systemsmentioning

confidence: 99%

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Corrosion Stiction in Automotive Braking Systems

2023

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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.

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Section: Electrochemical Methodsmentioning

confidence: 99%

Section: Corrosion-related Phenomena In Braking Systemsmentioning

confidence: 99%

Corrosion Stiction in Automotive Braking Systems

2023

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“…This renders the braking system of these vehicles more susceptible to stiction than in conventional combustion engine vehicles, which are not equipped with a regenerative braking system. The use of organic [ 17,18 ] and inorganic corrosion inhibitors, [ 19 ] based on different protection mechanisms, [ 20 ] is a common practice to reduce gray cast iron corrosion in automotive braking systems. This work explores how galvanic coupling, arising from the presence of a controlled amount of copper inside the friction material, may affect the onset of the stiction phenomenon.…”

Section: Introductionmentioning

confidence: 99%

Role of copper and zinc additives in the stiction phenomenon of automotive braking systems

Motta,

Iodice,

Xicola

et al. 2024

Materials & Corrosion

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The braking system of a motor vehicle is a multi‐material system, subjected to various aggressive conditions. Corrosion of the brake disc during stationary periods can determine the onset of a high adhesion force (stiction) capable of compromising the reliability of the braking system during vehicle motion. The purpose of this work is to study the effect of the introduction of Cu and Zn in the friction material composition. This effect was investigated through electrochemical measurements (electrochemical impedance spectroscopy, potentiodynamic polarization, and stiction tests), conducted using an electrochemical cell simulating the parking brake, complemented by the examination of the brake disc and pad surfaces and water absorption tests. The results suggest that porous components, like vermiculite, in the composite friction material led to high contact force. Moreover, 10 wt% of Cu in the friction material does not significantly affect its stiction behavior in our testing configuration. In contrast, 10 wt% Zn in the friction material significantly reduces the stiction propensity by acting with a complex synergistic mechanism combining physical and chemical shielding effects.

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“…Grey (lamellar graphite) cast irons (GCI) are the most commonly used cast materials for engineering purposes. They are widely used because they have many advantages, such as a high heat capacity, high thermal conductivity [8,9], a low melting point [10], high vibration damping, hardness, superior wear resistance [11] and good machinability [12]. These materials have a compressive strength, dimensional stability and tensile strength comparable to steel [11].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Mechanical Properties of Grey Cast Irons Reinforced with Carbon Titanium Nitride (TiNC)

Yakut

2023

Lubricants

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In this study, grey cast iron (GG25) was produced via reinforcement with carbon titanium nitride (TiNC) in different amounts (0%, 0.153%, 0.204% and 0.255%). Samples were made from this material according to the standards for hardness, compression and wear, and then experiments were conducted. The test conditions applied for the TiNC-reinforced samples were similarly applied to unreinforced samples. The TiNC-reinforced and unreinforced samples were compared regarding their compression, hardness, and wear properties. The results of the hardness tests showed the highest average hardness value of 215 HB for sample A (0% TiNC). For TiNC-reinforced specimens, the hardness values of the reinforced specimens increased with increasing reinforcement. Sample B (0.153% TiNC) had an average hardness value of 193 HB. For sample C (0.204% TiNC), an average hardness value of 200 HB was measured. For sample D (0.255% TiNC), an average hardness value of 204 HB was determined. Sample A’s highest compression strength value was 780 MPA (0% TiNC). Similar to the hardness test values, the compression strength of the reinforced samples increased with the increasing reinforcement rate. The compression test value was found to be 747 MPa for sample B (0.153% TiNC), 765 MPa for sample C (0.204% TiNC) and 778 MPa for sample D (0.255% TiNC). Wear tests were performed on all samples to examine changes in the wear volume loss, wear rate and friction coefficients. Scanning electron microscopy (SEM) was used to determine the wear mechanisms on the worn surfaces of the samples. When examining the wear condition of the samples with the same hardness value as a function of increasing load values, increases in the wear volume loss values were observed as the load value increased.

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Inhibitive effect of 8-hydroxyquinoline on corrosion of gray cast iron in automotive braking systems

Cited by 11 publications

References 34 publications

Corrosion Stiction in Automotive Braking Systems

Corrosion Stiction in Automotive Braking Systems

Role of copper and zinc additives in the stiction phenomenon of automotive braking systems

Investigation of Mechanical Properties of Grey Cast Irons Reinforced with Carbon Titanium Nitride (TiNC)

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