Czasopismo | OCHRONA PRZED KOROZJĄ | Rocznik 2013 - zeszyt 7

Protection of stainless steel by modifi cation with PEDOT/rhodanine anticorrosion coatings

LIDIA ADAMCZYK

nr katalogowy: 78085

This work summarizes the results of corrosion studies on the protective properties of composite coatings prepared on stainless steel. The coatings consisted of poly(3,4-ethylenodioxythiophene) (PEDOT) with rhodanine (R), which were electrodeposited by means of cyclic voltammetry. The protective properties of the composite fi lms were evaluated in acidifi ed sulphate solutions containing chloride ions. Keywords: conducting polymers, Poly(3,4-ethylenodioxythiophene), rhodanine, anticorrosion coating, stainless steel.Stainless steels are characterised by better corrosion resistance in non-oxidising environments compared to carbon and low-alloy steels. In particular, they are known to easily transfer into a passive state. A signifi cant drawback of stainless steels is the fact that despite the lack of visible corrosion products on the surface, stainless steel undergoes spontaneous and local dissolution in acidic, oxidizing environments, containing a selected few simple anions. In order to reduce the corrosion of stainless steel, different organic, metallic as well as combined organicmetallic coatings are often applied onto its surface [1.3]. There are coating materials available such as alkyd, epoxy and polyurethane binders, which are durable, resistant to radiation, temperature and chemicals. However, such coatings applied onto stainless steels have limited adhesion to the substrate and often fail in the presence of aggressive chloride ions. Conductive polymers, due to their wide range of applications, have found extensive use in engineering and are used in batteries [4, 5] as separator membranes, ion sensors and more recently in the corrosion protection of non-ferrous metals and steel [6.12]. Coatings made of conductive polymers are used in particular to protect passivating metals, such as Al, [11] Fe [13, 14], Zn, Mg, Ti or stainless steel [15.17]. The polymer coating maintains the corrosion potential of the protected [...]

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