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Mechanical Properties and Electrochemical Behavior of Electroless Ni–P-AlN Nanocomposite Coating
Mohammadhassan Badihehaghdam,Seyyed Mohammad Mousavi Khoie,Farzaneh Khast,Mobin Safarzadeh Khosrowshahi 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.6
Ni–P electroless coatings have already proven their ability to improve the tribological properties of various materials. Thisis possible due to their high hardness, good wear and corrosion resistance. However, the inclusion of AlN nanoparticlesinto Ni–P matrix can enormously enhance their properties. The aim of the present paper is to develop electroless Ni–P-AlNcomposite coatings as well as studying the effect of the incorporation of AlN particles on the structure, electrochemical, andmechanical properties of Ni–P alloy coating was studied. The morphology of the coatings were characterized using scanningelectron microscopy. In addition, X-ray diffraction was conducted to characterize the structure of the coatings. The microstructuralstudy showed that a uniform and fine-grained coating was accessible while using aluminum nitride. The additionof AlN particles resulted in higher hardness values and improved the wear resistance of the Ni–P coating. Another attainmentof this study was to investigate the effect of heat treatment on the attributes of Ni–P-AlN composite coating, which resultsshowed heat treating at 400 °C for 1 h led to the improvement of the chemical and mechanical properties on both the Ni–Pand the Ni–P-AlN coatings. The maximum hardness value obtained was 870 HV100after performing the heat treatment onthe nanocomposite coating. The same sample revealed a lower wear rate compared with that of the other samples. Also, thepresence of AlN nanoparticles as well as heat treatment resulted in the significant enhancement of the corrosion resistancecompared with that of the Ni–P coating.