Characterisations of low phosphorus electroless Ni and composite electroless Ni P SiC coatings on A356 aluminium alloy
ABSTRACT A low phosphorus electroless nickel coating of Ni 2.5 wt %P alloy and a composite coating of Ni 5 wt %P SiC were prepared on A356 aluminium alloy substrates using two types of electroless bath solutions, an alkaline bath for low phosphorus and acidic for composite plating. The coatings morphologies have been characterised using optical and scanning electron microscopy. In addition, X ray diffraction, microhardness, reciprocating wear testing and adhesion tests have been conducted to characterise structure and mechanical properties of the resulting coatings. The results obtained revealed that a crack free and homogeneous coating could be produced using an optimum bath formulation. The maximum thickness of the composite coatings was 50 um, the thickness of coatings tested. The composite coating was more resistant to wear in comparison to the low phosphorus nickel one, but had lower adhesion.