Al-Mg-Si alloys have great potential as mechanical and electrical components for micromechanical systems. Hence, surface durability is a major factor for an efficient service lifespan of these component. However, the service life of the alloy can be deteriorated by wear, depending on the aggressive environment which may result in failure during service. Therefore, the development and design of coatings as mechanical defense mechanisms to withstand the demanding service requirements is an essential aspect for advanced industrial product realization for automotive applications. In this study, Ni-Cu alloy binary and Ni-Cu/In ternary alloy coatings were electrodeposited on an Al-Mg-Si substrate. The effect of Cu and In on the microstructural evolution, nanomechanical and tribological performance of the advanced coatings were investigated. The results showed that at Ni5Cu and Ni5Cu3In binary and ternary coatings respectively, had improved nano-mechanical and tribological properties compared to other compositions. Hence, concluding that 5 wt.% Cu and 3 wt.% In for Ni-Cu/In structural composite coating on Al-Mg-Si alloy via electrodeposition are the optimized compositions which can be used in improving the mechanical properties of the Al-Mg-Si alloy for automotive applications.
Zn-Al2O3 composite coating electrodeposits have been produced from chloride bath in the presence of Triethanolamine (TEA) and Monoethanolamine (MEA). The plating effect of TEA and MEA as addition agent on the Zn-Al2O3 alloy is investigated using SEM/EDS, x-ray diffraction (XRD) and atomic force microscope (AFM). The mechanical properties were examined through micro-hardness tester. The presence of TEA and MEA as a surface-active additive is also felt to accompany the performance of the fabricated coating. The SEM results for Zn-Al2O3 deposits in the presence of TEA/MEA indicate that surface-active additive have a strong influence on the deposit surface morphology and improved micro-hardness behavior which is assisted by the change in the deposition process parameter.
A saturated solution of PbCrO4 has been proposed as a Calibration Reference Material for Cr(VI). Statistically evaluated results of Cr(VI) determination in a saturated solution of PbCrO4 by electrothermal atomization atomic absorption spectrometry (ETAAS) confirm that the found concentration of Cr(VI), (6.99 ± 0.34 μg l−1) is in complete agreement with the calculated value of Cr(VI) in that solution—7.0 μg l−1. The advantage of such a Calibration Reference Material is that the concentration of Cr(VI) is theoretically predictable on the base of solubility product constant and does not require independent determination.
-3 NaCl solutions by cyclic potentiodynamic and open circuit polarization. Characterizations of the electrodeposited coatings were carried out using scanning electron microscopy equipped with energy dispersive spectrometer (SEM/EDS) and X-ray analysis diffraction (XRD). The experimental results show that significant change in the presence of the additives influences the crystal orientations, resulting into precipitation of ZnAl3.Si and Zn2Al5 phases. The change in structure can also be linked to a robust blocking effect of the cationic surfactant of solanum tuberosum juice and Al dispatched oxide films which might influence nuclei replenishment and impact smaller grain size.
'%3e%3cpath fill='%23001489' d='M0 0v6h9V0z'/%3e%3cpath fill='%23e03c31' d='M0 0v3h9V0z'/%3e%3cg stroke='%23fff' stroke-width='2'%3e%3cpath id='d' d='m0 0 4.5 3L0 6m4.5-3H9'/%3e%3cuse xlink:href='%23b' stroke='%23ffb81c' clip-path='url(%23c)'/%3e%3c/g%3e%3cuse xlink:href='%23d' fill='none' stroke='%23007749' stroke-width='1.2'/%3e%3c/g%3e%3c/svg%3e)
