The technological conditions for preparing Ni-P-Al2O3composite coating on the surface of Q 235steel were studied,and the properties of the coating,such as composition,surface morphology,hardness,corrosion resistance,etc.were also characterized.Through experiment,the optimal process conditions were obtained：temperature 85℃,pH value 4.6,Al2O330 g/L.The results of SEM and EDS analyses show that Al2O3particles can be activated in the bath,and will be covered an even nickel deposit in the process entering the composite coating.The performance tests indicate that the Ni-P-Al2O3composite coating is obviously superior to Ni-P coating in both hardness and corrosion resistance.
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