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Aluminium and its alloys have been widely used in electric power fields while contamination can cause serious problems to their functionality.Many researches about superhydrophobic coating have been done in order to solve this problem,but the challenge is to achieve the design principle(i.e.their requirement for micro-and nano-structures)and the need for coating strength simultaneously.Here,a superhydrophobic aluminium alloy was prepared by one-step spray coating of an alcohol solution consisting of hydrophobic silica nanoparticles and bonding agents.The water contact angle and sliding angle on the superhydrophobic aluminium alloy were 160±1° and 2°,respectively.In addition,the superhydrophobic aluminium alloy showed excellent self-cleaning property.Moreover,this kind of superhydrophobic aluminium alloy maintained their performances after the damage of knife-scratch.