The Effect of Bath Ph on the Phase Formation of Ternary Co-Ni-Fe Nano-Coatings

Abstract:

This study describes how the control of bath pH allows different types of phase formation in the ternary Co-Ni-Fe nanocoating. The acidity of the plating bath has been known as a main factor to the properties of coatings. The Co-Ni-Fe coating was fabricated using a commercial electrodepostion process. Several pH solutions (3, 7 and 9) were employed to determine the optimum condition for Co-Ni-Fe synthesis. The bath pH was varied by using sodium hydroxide (NaOH) and sulphuric acid (H₂SO₄). Other parameters such as temperature, electrolyte composition, deposition time and current density were kept constant. The experiment was performed at 50°C. This temperature is commonly used in the industrial plating process. XRD analysis indicated the presence of both phases: body centred cubic (BCC) and face centred cubic (FCC) dependent on the pH value. Co-Ni-Fe nanocoatings obtained from the electrolyte of low pH showed the fine-grain morphology. The hardness of the Co-Ni-Fe nanocoatings was closely related to the obtained morphology.

• Periodical: Applied Mechanics and Materials (Volume 391)
• Pages: 9-13
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.391.9
• Online since: September 2013
• Authors: Nor Azrina Resali, Koay Mei Hyie, Wan Normimi Roslini Abdullah, M.A.A. Ghani, A. Kalam
• Keywords: Microhardness, Nanocoating, pH, Phase Formation, Ternary Co-Ni-Fe

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