The rate of corrosion of 7075 aluminium alloy in 0.1M sodium chloride solution, is decreased by the addition of 1000 ppm of FeCl2, CoCl2, NiCl2, YCl3, LaCl3, NdCl3, PrCl3 or CeCl3. In each case the protective cation is slowly incorporated into the oxide film which develops on the alloy surface during exposure to the solution. The most protective of the cation additions examined (i.e. Ce3+, La3+, Pr3+, Nd3+ and Ni2+) each developed surface films which modified the susceptibility to corrosion by suppressing the kinetics of the oxygen reduction reaction at cathodic sites on the surface.

Subject
Corrosion rate, Metal surfaces, Aluminum, Sodium chloride, Oxide films, Sodium chloride solution, Film formation, Pitting, Oxygen, Risk reduction, Aluminum alloys, Cations, Corrosion potential
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1986
Association for Materials Protection and Performance (AMPP)
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