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- Title
A Comparative Study of the Electrochemical and Microstructural Characteristics of Optimized Electroless Ni-P-SiO<sub>2</sub> Nanocomposite Coatings Using a Sulphamate Bath on Brass Alloy.
- Authors
Mahdavi, Narges; Sarabi Dariani, Ali Asghar
- Abstract
In this study, the anti-corrosion behaviour of coated samples from nickel sulphamate bath with different amounts of SiO2 nanoparticles (NPs) was investigated using potentiodynamic (DC) polarization and electrochemical impedance spectroscopy (EIS) test in a 3.5 wt.% NaCl solution. Next, the coating morphology and distribution of SiO2 NPs were evaluated using field emission scanning electron microscopy (FESEM). Also, the coatings' structure and chemical composition were obtained using x-ray diffraction (XRD) and energy-dispersive spectroscopy (EDS), respectively. Finally, the microhardness of the nanocomposite coatings was measured using the Vickers microhardness test, and the topography of optimum Ni-P and Ni-P-SiO2 coatings was evaluated by atomic force microscopy (AFM). According to results, the microhardness of the nanocomposite coatings was increased compared to the bare sample. In contrast, the roughness of the optimized Ni-P-SiO2 (1 g/L) nanocomposite coating was decreased compared to optimized Ni-P coating. The SiO2 NPs amount affected the phosphorus content (9–15 wt.% P) and created coatings with semi-crystalline and fully amorphous structures. Overall, the best anti-corrosion behaviour was obtained in optimized Ni-P-SiO2 (1 g/L) nanocomposite coating (Rp = 50,709 Ω cm2 and icorr = 0.45 μA/cm2), which significantly improved compared to the bare sample (Rp = 3687 Ω cm2 and icorr = 2.72 μA/cm2).
- Subjects
FIELD emission electron microscopy; CHEMICAL structure; NANOCOMPOSITE materials; SURFACE coatings; ATOMIC force microscopy
- Publication
JOM: The Journal of The Minerals, Metals & Materials Society (TMS), 2023, Vol 75, Issue 12, p5103
- ISSN
1047-4838
- Publication type
Article
- DOI
10.1007/s11837-023-06014-y