Polyaniline (PAni) and poly(1,5-diaminonaphthalene) (poly1,5-DAN) films can
be deposited on mild steel from aqueous HClO4. This medium allows passivat
ion of the substrate without preventing monomer oxidation. The films are un
iform, with controlled thickness and exhibit electroactive properties betwe
en 0.3 V and 1.0 V SCE which are similar to: those of PAni and poly(1,5-DAN
) generated on platinum. Electrosynthesis performed in the presence of two
monomers leads to a. composite film which presents excellent adhesion prope
rties on mild steel.