Discussion on the Behavior of a Porous Anodic Film on Aluminum in H3PO4 Studied by Electrochemical Techniques

摘要: Abstract The dissolution behavior of anodic oxide films formed on aluminum in phosphoric acid solutions has been studied by impedance and potential measurements. follows a first order mechanism. Results indicate that the film is duplex nature. Changes current density (CD) during anodizing apparently affect thickness outer layer only. increases with increasing concentration, while inner not affected same degree changes concentration. influence some anions rate indicates among PO43−, SO42−, NO3−, l−, Br−, ClO4−, last two are most aggressive. presence different related to resulting field strength it induces each across as well its adsorption properties.