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

: Schneider, Michael; Kremmer, Kerstin; Tabatabai, Dominik; Fürbeth, Wolfram


Materials and corrosion 69 (2018), No.8, pp.971-977
ISSN: 0947-5117
ISSN: 0043-2822
ISSN: 1521-4176
Bundesministerium für Wirtschaft und Technologie BMWi
IGF; 472 ZBG
Journal Article
Fraunhofer IKTS ()

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 amt. 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 oxidn. 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.