Cobalt and Nickel Cations as Corrosion Inhibitors for Galvanized Steel

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Abstract
Gravimetric measurements on galvanized steel and cathodic polarization curves indicate that corrosion of zinc in 3% is inhibited by a low concentration of cobalt ions in solution or by simple predipping of the zinc in 0.05 or 0.1M solutions of . Corrosion inhibition is also obtained when zinc is predipped in a nickel acetate solution and nickel ions are present in the solution. The corrosion inhibition is attributed to the introduction of electron traps (cobalt or nickel atoms) in the oxide on the surface of zinc which lead to inhibition of the cathodic reaction, . When the concentration of elemental cobalt or nickel in or on the oxide becomes too great, the cathodic reaction, , is catalyzed and corrosion activation occurs.

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