Electrochemical deposition of a carbon nanotube-poly(o-phenylenediamine) composite on a stainless steel surface

▶ Deposited nano-composite layers made of carbon nanotubes and poly(o-phenylenediamine) keep the stainless steel in a passive state in acidic solution. The oxide film underneath the nano-composite layer is chromium enrichment and has high corrosion resistance in concentrated chloride solutions. The CNTs indirectly assist the passivation of the stainless steel by catalyic oxygen reduction and polymer oxidation process.