The electrosynthesis of PPy films onto 316L stainless steel from nearly
neutral and alkaline solutions containing molybdate and salicylate is
reported. The corrosion behaviour of the coatings constituted by hollow
rectangular microtubes was monitored in Ringer solution using open circuit
potential measurements, polarization techniques and electrochemical
impedance spectroscopy. The polymer formed in a solution of pH 8 was the
most efficient in terms of corrosion protection. The coating significantly
reduced the pitting corrosion of the substrate. The results were interpreted
taking into consideration the polymer electroactivity, the galvanic
interaction polypyrrole/substrate and the nature of dopants. Silver species
were effectively immobilized onto the hollow rectangular-sectioned
microtubes of PPy. The modified coatings demonstrated that they have a good
bactericidal activity against Escherichia coli and they were also able to
protect the substrate against corrosion in Ringer solution.
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