Abstract
The addition of silicon carbide (SiC) nanoparticles into electroless nickel (Ni)-based coatings improves both corrosion resistance and mechanical properties of the resulting Ni-P/SiC nanocomposite coatings, making them potential candidate as protective coatings in aggressive environments. Ni-P/SiC nanocomposite coatings were produced from precursor bath with small SiC loading levels (0.25 or 1.0 g/L) and characterized for morphology, corrosion resistance, and hardness. Microstructural examination using FE-SEM and AFM revealed that incorporation of uniformly dispersed SiC nanoparticles leads to smaller nodule size with fine-grain structure and low surface roughness. Electrochemical impedance spectroscopy studies in 4 wt.% NaCl solution showed that the nanocomposite coatings exhibit excellent corrosion resistance, as indicated by high charge-transfer resistance and low double-layer capacitance values of ~137 kΩ cm2 and 19 µF cm−2, respectively. The coatings maintained their structural integrity even after 5 days of saline bath immersion, as there was no cracking in the deposit microstructure besides formation of shallow pits and submicron-sized pores. A two-fold increase in the average hardness value was noticed from 4.5 (pure Ni-P) to 8.5 GPa (Ni-P/SiC coating) which can be ascribed to modified deposit morphology and uniformly dispersed SiC nanoparticles that act as obstacles to plastic deformation.
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The authors gratefully acknowledge the technical and financial support of the Research Center of College of Engineering, Deanship of Scientific Research, King Saud University.
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Islam, M., Azhar, M.R., Khalid, Y. et al. Electroless Ni-P/SiC Nanocomposite Coatings With Small Amounts of SiC Nanoparticles for Superior Corrosion Resistance and Hardness. J. of Materi Eng and Perform 24, 4835–4843 (2015). https://doi.org/10.1007/s11665-015-1801-x
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DOI: https://doi.org/10.1007/s11665-015-1801-x