Microstructure, friction and corrosion resistance properties of a Ni-Co-Al2O3 composite coating

Ni-Co-Al 2 O 3 composite coatings were prepared by pulsed electrodeposition and electrophoresis-electrodeposition on aluminum alloy. The content of Al 2 O 3 particles of the Ni-Co-Al 2 O 3 composite coating prepared by electrophoresis-electrodeposition was significantly higher than the composite coating prepared by pulsed electrodeposition. The composite coating prepared by electrophoresis-electrodeposition exhibited a better anti-wear performance than that prepared by pulsed electrodeposition. The morphology, composition and microstructure of the composite coatings were determined by means of X-ray diffractometer (XRD) and scanning electron microscopy (SEM). The hardness and friction properties of the samples were tested on the microhardness tester and the friction and wear loss tester respectively. Ni-Co-Al 2 O 3 composite coatings were prepared by pulsed electrodeposition and electrophoresis-electrodeposition on aluminum alloy.