The Exploration of The Conductive Oxidation Process for Casting Aluminum Alloy ZAlSi7Mg1A
ZAlSi7Mg1A(ZL114A)cast aluminum alloy is a widely used cast Al-Si alloy material,which is suitable for aviation,aerospace and weapons industry and other fields.This study focuses on investigating the Natural color conductive anodizing process of ZAlSi7Mg1A(ZL114A)cast aluminum alloy and conducts numerous experiments to optimize pretreatment and reaction processes.After alkaline drop test,copper sulfate drop test and salt spray test,the Natural color conductive anodizing film with good wear resistance and corrosion resistance was finally obtained.At the same time,the conditions affecting the formation and corrosion resistance of ZAlSi7Mg1A(ZL114A)cast aluminum alloy Natural color conductive anodized were also explored.The effects of temperature,tracheal opening,deionized water,phosphoric acid,chromate anhydride,sodium fluoride,repeated oxidation and aging on the formation and corrosion resistance were discussed.And the corrosion resistance of the more mature conductive oxidation process(chromate film)was compared.The following conclusions were drawn after analysis:(1)The ash and poor performance of the Natural color conductive anodized film are mainly the problem of the light extraction step;(2)Under the condition of 28～30° C,a certain concentration of phosphate-chromate solution,pH is 1.8～2.1,and the reaction time is 4min,the corrosion resistance reaches the best.
casting aluminum alloynatural color conductive anodizingcorrosion resistance
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