Nano-sized zeolite particles as inhibitor carrier in plasma electrolytic oxide layers on AZ31

M. Schneider, K. Kremmer, D. Tabatabai, W. Fürbeth

Materials and Corrosion, 69, 8 (2018) 971-977


Plasma electrolytic layers on AZ31 provide an efficient corrosion protection. However, the process-related pores and holes are weak points in view of risk of corrosion. The incorporation of a small amount of nano-sized inhibitor-loaded zeolite particles leads to a significant improvement of the corrosion resistance. The study shows that the inhibitor-loaded particles can be incorporated directly during plasmaelectrolytic oxidation in a one-step-process. The risk of pitting corrosion decreases in comparison with inhibitor free anodized layers and the cerium inhibitor was found to deposit directly inside pits.


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