Corrosion resistant high-silica-zeolite MFI coatings

Metal corrosion is a ubiquitous problem and generally costs an industrialized country several percent of its gross domestic product. The development of satisfactory protective finishes continues to be of great importance. Many of the protective finishes used today utilize chromium, which in its hexavalent state is a known human carcinogen. We have been investigating the application of zeolite films as chromium-free protective coatings on aluminum alloys and steels [1-4]. In this paper we summarize our most recent works that experimentally demonstrates that high-silica-zeolite (HSZ) coating on metal and metal alloys is a viable replacement technology for corrosion protection of metals.