Multi-stage AC silver foil band corrosion device

The utility model relates to a multi-stage AC aluminium foil band corrosion device, which belongs to a surface treatment device for aluminium foil bands. A machine frame is orderly provided with corrosion slot bodies 5, 6, 7 which are filled with spirit of salt 3. Four graphite pole plates 4 are formed into the first group, eight graphite pole plates are formed into the second group, and twelve graphite pole plates are formed into the third group. Three groups are parallelly inserted into the spirit of salt 3 in the corrosion slot bodies 5, 6, 7. The adjacent two graphite pole plates 4 in the middle of each group are connected in parallel with each other to form one pole, and the two graphite pole plates separated to both sides are connected in parallel with others to form the other pole which is connected with a single-phase AC power source 8. The utility model has the advantages of less investment, good quality, and high yield.