Cobalt ferrite nanoparticles (CFO-NPs) were used in electroless Ni-P solution to form a Ni-P-CoFe2O4 composite coating (CFO@Ni-P) on copper substrate. CFO-NPs with average size of 164 nm were synthetized using solution combustion method and the size of the particles was reduced to 105 nm and 78 nm, through mechanical milling. These nanoparticles were then added to Ni-P bath to form a composite coating. Investigation of morphology, corrosion resistance, the erosion-corrosion resistance, and magnetic properties of the samples conducted. It is revealed that, addition of nanoparticles with average size of 164 nm and concentration of 2 g/l, causes an increase corrosion and tribocorrosion properties of the coating. Cobalt ferrite nanoparticles participation in the coating causes appearance of a remnant magnetization in the composite coating, which reduces with decreasing CFO granular size. (C) 2019 The Society of Powder Technology Japan. Published by Elsevier B.V. and The Society of Powder Technology Japan. All rights reserved.