▎ 摘　　要

NOVELTY - Automobile top cover aluminum alloy shell, comprises an aluminum alloy substrate. The surface of the aluminium alloy substrate is orderly provided with a transition layer, an intermediate layer and a corrosion resistant coating. The transition layer is an electro deposition silicon dioxide layer. The middle layer is formed by stacking two layers of modified silicon dioxide USE - Used as automobile top cover aluminum alloy shell. ADVANTAGE - The aluminum alloy shell: has excellent corrosion resistance and high practicability. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing the automobile top cover aluminum alloy shell comprising (i) taking an aluminum alloy substrate, polishing the surface, placing the aluminum alloy substrate into an acetone solution, carrying out ultrasonic cleaning, placing the aluminum alloy substrate into an ethanol solution, continuously cleaning, washing with deionized water and carrying out vacuum drying for later use, (ii) taking absolute ethyl alcohol and sodium nitrate, mixing and stirring, adding ethyl orthosilicate, adjusting pH, continuously stirring under a sealed condition, and then stirring in a water bath at 25-28degrees Celsius for 4-6 hours to obtain a solution A, placing the aluminum alloy substrate treated in the resultant step in the solution A, and electro depositing silicon dioxide on the surface of the aluminum alloy substrate to form a transition layer, (iii) taking iron oxyhydroxide, absolute ethyl alcohol and deionized water, uniformly mixing, adding ammonia water, stirring and dispersing, adding tetraethoxysilane, continuously stirring, sequentially washing by the absolute ethyl alcohol and the deionized water and drying in vacuum to obtain modified silicon dioxide, taking modified silicon dioxide and isopropanol and performing ultrasonic dispersion to obtain a solution B, placing the aluminum alloy substrate treated in the resultant step in a toluene solution of 3-aminopropyltrimethoxysilane, soaking, washing the toluene, sequentially cleaning the washed toluene by absolute ethyl alcohol and deionized water, then soaking the washed toluene in a hydrochloric acid solution, washing the washed deionized water, placing the washed deionized water in a solution B and soaking for 1-2 hours to form a first layer of modified silicon dioxide, (iv) repeating the resultant step and stacking a second layer of modified silicon dioxide on the surface of the aluminum alloy substrate to form an intermediate layer, (v) uniformly mixing polyurethane azide and dimethylacetamide to obtain a solution C, taking graphene oxide and dimethylacetamide, mixing uniformly, performing ultrasonic oscillation, adding the solution C, continuously stirring and placing under an oil bath at 150-160degrees Celsius, mixing and stirring uniformly modified graphene oxide, water-based epoxy resin, azide epoxy resin, a curing agent, a defoaming agent, a dispersing agent, a film-forming assistant and a flatting agent to prepare the corrosion-resistant coating and coating the corrosion-resistant coating on the surface of the aluminum alloy substrate treated in the resultant step and drying by hot air to obtain a final product.