HOT-DIP CAST ALUMINUM ALLOY CONTAINING AL-ZN-SI-MG-RE-TI-NI AND PREPARATION METHOD THEREOF

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The invention relates to a hot-dip cast aluminum alloy for anticorrosion treatment on engineering parts resistant to marine climate and a preparation method thereof, wherein said cast aluminum alloy contains Al, Zn, Si, Mg, RE, Ti, Ni and a nanometer oxide particle reinforcing agent, said nanometer oxide particle reinforcing agent is selected from one or two of TiO 2 and CeO 2 , the mass percentage of the components is as follows : Zn : 35-58 %, Si : 0.3-4.0 %, Mg : 0.1-5.0 %, RE : 0.02-1.0 %, Ti : 0.01-0.5 %, Ni : 0.1-3.0 %, and the total content of the nanometer oxide particle reinforcing agent : 0.01-1.0 %; and the balance consists of Al and inavoidable impurities. A coating using a cast aluminum alloy prepared by the invention has sufficient corrosion resistance and scour resistance in marine climate.