The results indicate that the cerium film formed on the zinc surfaces markedly suppressed the cathodic process.
The behaviour of untreated zinc surfaces in de-aerated 0.01 M NaCl solutions containing different concentrations of dichromate was also studied.
The corrosion behaviour of pretreated zinc surfaces under immersion in sodium chloride was investigated by potentiodynamic polarization to evaluate the effect of cerium on the oxygen reduction reaction.
The corrosion protective properties of these layer systems lead to a significant increase in the corrosion resistance of zinc surfaces, clearly exceeding that of chromate conversion coatings.
The electrochemical studies revealed that the corrosion kinetics at the metal cut-edges decreases during immersion, which could be due to formation of corrosion products on both steel and zinc surfaces.
For the example of pure zinc surfaces, the characterization of the integrated spectroscopic system is presented with a Zn2+ detection limit below 0.1 μmol l−1 using Zincon as complexing agent.
