Experimental Investigations on the Effect of Reinforcement Coating on Magnesium Composites for Automotive Brake Pad

Abstract

The braking system is an important component in the automobile sector for transportation. To stop or slow down the vehicle safely, the friction brakes are employed by converting the kinetic energy to heat energy by friction. The interaction of surface materials such as rotor and pad produces heat due to friction and those materials should have a thermally stable tendency to deal with the heat than wear resistance. In this study, for the first time, an attempt is made to check the possibilities of introducing the Mg composite into brake pad applications. The inorganic type friction materials with various components of materials are constantly growing to get the high-performance and low-cost brake pad for commercial vehicles. The Mg composite is reinforced with electroless Ni-P-coated alumina and silicon carbide microparticles using the parameter optimized stir-squeeze method. The particles are coated by using the electroless method and various Mg composites such as Mg alloy, Mg + coated Al2O3, Mg + coated Al2O3, Mg + coated Al2O3, and SiC are prepared. The tribological properties of the newly formulated magnesium composite are premeditated using a tribometer. The brake pad (Mg composite) material is used as a pin, and the disc material (stainless steel) is used as a plate for the experiments. Characterization of the composites is done using a FESEM machine with the attachment of EDAX to measure the elements present in the composite. The results revealed that porosity reduced significantly for the composite which has coated reinforcements. The hardness and compression strength of the composite are also enhanced for the composite which has coated reinforcements. The wear resistance of the prepared Mg composite is closer to other brake pad data, and thus, the material can be used as friction material for automotive brake pad applications.

Novel Phosphate Conversion Coating with Superior Corrosion Resistance on the Mg-Al-RE Alloy Based on the Introduction of Silane

“…Then, at a scan rate of 1.0 mV/s, the potentiodynamic polarization scans were performed to scan the −250.0 to +500.0 mV concerning OCP. A sine wave with an amplitude of 5.0 mV and a frequency of 10.0 −2 to 10.0 5 Hz was used for EIS measurements. ZView software was used to analyze and fit the most recent EIS spectra.…”

“…In addition, they have specific stiffness, good castability, high thermal conductivity, low sensitivity to intergranular corrosion and stress corrosion, and low environmental pollution . As a result, Mg alloys are widely used in engineering applications, such as those in aerospace, automotive manufacturing, electronic products, and defense industries. , …”

“…3 As a result, Mg alloys are widely used in engineering applications, such as those in aerospace, automotive manufacturing, electronic products, and defense industries. 4,5 Rare earth elements have been added to Mg alloys to promote their various properties and expand their applications. 6−8 However, the standard electrode potential of Mg (−2.363 V) is relatively lower than that of other commonly used metals, 9 which makes it susceptible to galvanic corrosion.…”

“… 3 As a result, Mg alloys are widely used in engineering applications, such as those in aerospace, automotive manufacturing, electronic products, and defense industries. 4 , 5 …”