(142aa) Hydrothermal Synthesis and Corrosion Resistance of Vanadium Zsm-5 Films
AIChE Annual Meeting
Monday, October 31, 2005 - 6:00pm to 8:30pm
ZSM-5 coatings have been shown to be remarkably corrosion resistant in acids, bases and pitting-aggressive solutions [1-2]. Vanadium compounds are versatile corrosion inhibitors which are used to protect engineering materials. In ferritic stainless steels, V additions have been observed to increase the pitting potential measured in 3.5% NaCl solution . In this study, we introduced vanadium into ZSM-5 coating synthesis and attempt to hence corrosion resistance and self-healing of as-synthesized V-ZSM-5 coatings. The coatings were characterized by XRD, SEM, EDX, polarization measurement, and shown to be highly corrosion resistant. The synthesis parameters (vanadium source, V/Si ratios, Na/Si ratios in the starting material) have been optimized in order to control the morphological characteristics and enhance their corrosion protection for aluminum alloys. Na/Si ratios were found to play a great role in the coating formation and their corrosion resistance. The V-ZSM coatings demonstrated good corrosion protection accompanied with released the vanadium. Under soaked in NaCl (0.856M) solution for some time (>12hrs), the scratched coatings showed much lower corrosion current than unscratched ones. The vanadium ZSM-5 films can potentially serve as an environmentally friendly, alternative corrosion-resistant coating for aluminum alloys.
 X. Cheng, Z. Wang, and Y. Yan, Electrochem. Solid-State Lett., 4, B23 (2001).
 A. Mitra, Z. Wang, T. Cao, H. Wang, L. Huang, and Y. Yan, J. Electrochem. Soc., 149 (10), B472 (2002).
 A. J. Sedricks, Corrosion of Stainless Steels (New York, NY: John Wiley & Sons), 118 (1996).