A novel chromium-free protective coating films based
on a zeolite coating was growing onto a FeCrAlloy metal using in –
situ hydrothermal method. The zeolite film was obtained using in-situ
crystallization process that is capable of coating large surfaces with
complex shape and in confined spaces has been developed. The
zeolite coating offers an advantage of a high mechanical stability and
thermal stability. The physicochemical properties were investigated
using X-ray diffraction (XRD), Electron Microscopy (SEM), Energy
Dispersive X–ray Analysis (EDX) and Thermogravimetric Analysis
(TGA). The transition from oxide-on-alloy wires to hydrothermally
synthesised uniformly zeolite coated surfaces was followed using
SEM and XRD. In addition, the robustness of the prepared coating
was confirmed by subjecting these to thermal cycling (ambient to
 Yan, Y. and A.Richards, Zeolite Coatings by In-Situ Crystallization as
an Environmentally Benign Alternative to Chromate Conversion and
Anodization Coatings, University of California - Riverside, 2004
 Yan, Y. Zeolite coating system for Corrosion to Eliminate Hexavalent
Chromium from DOD Applications, Serdp project WP-1342, 2009: p.4-
 Zamaro, J.M . and E.E. Miro, Novel binderless zeolite-coated monolith
reactor for environmental applications, Chemical Engineering
 Meille, V., Review on methods to deposit catalysts on structured
surfaces. Applied Catalysis A: General, 2006. 315: p. 1-17.
 Munoz, R., et al., Zeolite Y coatings on Al-2024-T3 substrate by a threestep
synthesis method. Microporous and Mesoporous Materials, 2005.
86(1): p. 243-248.
 Wang, Z., J. Hedlund, and J. Sterte, Synthesis of thin silicalite-1 films on
steel supports using a seeding method. Microporous and Mesoporous
Materials, 2002. 52(3): p. 191-197.
 Mies, M., et al., Hydrothermal synthesis and characterization of ZSM-5
coatings on a molybdenum support and scale-up for application in micro
reactors. Catalysis today, 2005. 110(1): p. 38-46.
 Chou, Y.H., et al., Mesoporous ZSM-5 catalysts: Preparation,
characterisation and catalytic properties. Part I: Comparison of different
synthesis routes. Microporous and Mesoporous Materials, 2006. 89(1):
 Vassilakis, J.G. and D.F. Best, Novel zeolite compositions derived from
zeolite Y. US Patent 5,013,699, 1991 - 1991, Google Patents.16.
Danilatos, G., Review and outline of environmental SEM at present.
Journal of Microscopy, 2011. 162(3): p. 391-402.