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    Effect of pH on Electrodeposition of Ni–Cd Alloy Coatings and Their Anticorrosion Performance
    (Springer Nature, 2022) Gonsalves, C.N.; Sneha, I.M.; Hegde, A.C.
    Electroplating is a complex process controlled by bath composition and operating parameters. Among many operating parameters, the pH of the bath plays an important role in the process of deposition and properties of coatings. The present paper reports the effect of pH in the electrodeposition process of Ni–Cd alloy coatings from a low concentration bath of Ni–Cd alloy, using glycine as an additive. The experimental results revealed that change of pH over a wide range (from lower acidic to higher basic conditions) has a significant effect on the structure, morphology, and composition of the alloy electrodeposits. A considerable increase in the uniformity of coatings was found with an increase in bath pH. Electrochemical corrosion study carried out in 3.5% NaCl medium demonstrated higher corrosion resistance for Ni–Cd alloy coating, deposited at pH 8.0 compared to those deposited at lower pH. A change in the process of electro-crystallization was found with the change of pH, confirmed by the scanning electron microscopy (SEM) study. The improved corrosion resistance of alloy coatings was ascribed to the change of codeposition from anomalous to normal type, known by its Ni content confirmed by the energy dispersive X-ray spectroscopy analysis (EDAX). A change in phase structure was found with the change of pH, confirmed by the X-ray Diffraction (XRD) technique. Experimental results are analyzed in light of the theory of alloy deposition, and results are discussed. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.
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    Electrodeposited Metallic/ Nanocomposite Coatings
    (CRC Press, 2023) Elias, L.; Hegde, A.C.
    Magnesium (Mg) alloys have emerged as the lightest structural material with attractive mechanical properties in combination with other characteristics of good biocompatibility, easy recyclability, large hydrogen storage capacity, high theoretical specific capacity, etc. The ever-increasing trend in the number of publications on Mg and Mg alloys in the past two decades indicates that the research interest on Mg alloys is attaining more and more attention. However, the inferior corrosion resistance is still persisting as a major bottleneck towards their wide practical application. Although there are different strategies to improve the corrosion resistance of Mg alloys, surface coatings attract a lot of attention, since the coatings improve corrosion resistance along with enhancement of other characteristics such as wear resistance, antibacterial activity, hydrophobicity, decorative appeal, etc. Among the various methods available for the development of surface coatings, electrode position is known to be a simple and efficient method for the deposition of coatings at ambient temperature with tuned characteristics and great degree of reproducibility. The chapter presents a concise discussion on the different types of electrodeposited coatings for their corrosion protection. © 2024 selection and editorial matter, Viswanathan S. Saji.