Electroless nickel plated graphite fibers and surface behavior in Gr(Ni)/6061Al composite

The electroless nickel plated graphite fibers reinforced aluminum matrix composites (Goo/A1) were produced by squeeze casting, and the microstructure of GrashiAl composite and surface behavior of Ni-P coating were studied. The optimum process of electroless Ni-P plating included: burning to get rid of glue degreasing- > neutralization- > acidulating - > sensitizing-activation- > electroless plating. The surface analysis results show that the electroless nickel plating can diffuse into the graphite fiber surface during the squeeze casting, and the Ni-P coating and aluminum alloys can produce brittle phase NiAl3 or NiAl. The X-ray diffraction(XRD) results indicate that Al4C3 is so little that no Al4C3 peaks are found, and the harmful Al4C3 can be decreased by the electroless plating Ni-P coating. The coating improves the interfacial bonding of continuous graphite fibers reinforced aluminum matrix composites.