在铝及其合金上进行电镀是比较困难的。因为铝对氧有高度的亲合力,在空气中极易被氧化,即使在刚处理完的表面上也会迅速形成一层氧化膜,使镀层与基体金属不能牢固的结合。铝及其合金表面生成的氧化膜均为两性性质的氧化膜,在镀前的表面预处理过程中,都要产生复杂的化学和电化学反应。铝的电极电位很负,很活泼,很易失去电子,在各种镀液中都易生成相对应的接 Plating on aluminum and its alloys is more difficult. Because aluminum has a high affinity for oxygen, it is easily oxidized in the air, and an oxide film is rapidly formed even on the surface just finished, so that the coating can not be firmly combined with the base metal. Oxide films formed on the surface of aluminum and its alloys are all amphoteric oxide films. Complex chemical and electrochemical reactions must be generated during the surface pretreatment before plating. Aluminum electrode potential is very negative, very lively, easy to lose the electronic, in a variety of bath are easy to generate the corresponding connection