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Growth and passivation of tunnels within Al foil by on-off controlling DC etching in 6 wt.% HCl solution has been investigated. It was found that, in a given etchant solution at a special temperature, the longest tunnel length was only a function of the turn-on interval of DC. The potential of Al foil broke at on-off controlling DC by the result from anode polarization curves and potential-time (E-t)...
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