Wear properties of as plated Ni-2.5P and Ni-5P-SiC on Al356

摘要

As plated Ni-2.5%P alloy and Ni-5%P-SiC composite coatings were prepared on Al356 surfaces, using two type electroless bath solution, alkaline bath for low P and basic for composite plating. The coatings were characterized by optical and scanning electron microscopy, XRD, microhardness, reciprocating wear testing and adhesion test (ASTM B571). The results show that a sound and homogeneous deposit can be produced using an optimum bath formulation. Maximum thickness was 50μm. Microhardness of Ni-2.5%P was near to Ni-5%p-SiC. Also, wear properties of composite coating better than Ni-2.5%P, but adhesion was poorer than Ni-2.5%P.