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Phthalocyanine and Polyphthalocyanine Coatings for Corrosion Protection of Metals

Published online by Cambridge University Press:  21 February 2011

S. Hettiarachchi ,
Y.W. Chan ,
R.B. Wilson  and
V.S. Agarwala
S. Hettiarachchi
Affiliation:
SRI International, 333 Ravenswood Avenue, Menlo Park, CA 94025
Y.W. Chan
Affiliation:
SRI International, 333 Ravenswood Avenue, Menlo Park, CA 94025
R.B. Wilson
Affiliation:
SRI International, 333 Ravenswood Avenue, Menlo Park, CA 94025
V.S. Agarwala
Affiliation:
Naval Air Development Center, Warminster, PA 18974–5000
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Abstract

The effectiveness of phthalocyanines and polyphthalocyanines as corrosion inhibiting coatings for protection of steel have been studied. The metallo-phthalocyanines studied included phthalocyanine tetracarboxylates of Fe(III), Co(II), VO(IV), Cr(III), Si(IV) and Zn(II). Polymeric phthalocyanine coatings based on Fe(III) polyphthalocyanines gave the highest inhibitor efficiency of 82%, as confirmed by AC impedance analysis. The polymerization was achieved by simple dip coating followed by heat treatment of the coated surface at 450°C in an inert atmosphere. The resulting coating is adherent and electrically conducting when appropriately doped. Our recent findings indicate that the inhibition efficiencies can be further improved by introducing a long alkyl chain into the phthalocyanine molecule.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 125: Symposium N – Materials Stability and Environmental Degradation , 1988 , 321
Copyright
Copyright © Materials Research Society 1988

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