The corrosion protective performance of hybrid inorganic/organic coatings on hot dip galvanized steel (HDGS) substrates was assessed by electrochemical methods and exposure in a salt spray chamber. Characterization of the coatings by transmission electron microscopy analysis indicated that they were composed of a zirconium oxide inorganic matrix containing organic polymer beads. It was found that the hybrid coatings effectively prevented the underlying HDGS substrates from corrosion in 0.5 M NaCl solution. The hybrid coating with incorporation of a cyclic-amine-containing polymer and vanadium pentoxide showed the best corrosion protective performance among the hybrid coatings. This protection was shown to occur via a controlled release of vanadium.

Subject
Scanning electron microscopy, Primers, Coating performance, Zinc rich coatings, Coatings, Substrates, Spray coating, Beads, Galvanized coatings, Sodium chloride solution, Polymers, Salt spray corrosion testing, Corrosion protection
Keywords:
corrosion inhibition, cyclic-amine-containing polymer, hybrid coating, vanadium
© 2017, NACE International
2017
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