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1994 Kluwer Academic Publishers, Boston. (1994年Kluwer学术出版商,波士顿。)
Journal of Sol-Gel Science and Technology, 2, 529-534 (1994)
© 1994 Kluwer Academic Publishers, Boston. Manufactured in The Netherlands.
Sol-Gel Coatings for Chemical Protection of Stainless Steel
Code: EP7
PEDRO DE LIMA NETO, MOHAMED ATIK, LUIS A. AVACAAND MICHEL A. AEGERTER
Institute of Physics and Chemistry of S~o Carlos, University of S~o Paulo, Cx. Postal 369 - 13560-970 - Sdo Carlos (SP), Brazil
Abstract. Sol-gel thin coatings of ZrO2, SiO2, 70SiO2-30TiO2 and 88SiO2-12A12Oa compositions (mole %) have
been prepared from sonocatalyzed sols and deposited by dip-coating technique on 316L stainless steel foils. The
influence of the coatings on the chemical corrosion of the substrate has been measured through potentiodynamic
polarization curves in aqueous 15% H2SO4 solution between 25 and 50°C. The values of the corrosion potential,
polarization resistance and corrosion rate have been determined. Analysis of the data combined with scanning
electron microscopy studies indicate that the films act as a geometric blocking against exposure to the corrosive
media and increase the lifetime of the substrate up to a factor 8.5.
Keywords: thin film, ZrO2, SiO~, SiO2 TiO2, SIO2-A1203, corrosion protection, stainless steel 316L
1. Introduction prevention for stainless steel has been so far reported
by our group using sol-gel film of ZrO2, SiO2-TiO2,
Sol-gel methods are now widely used for the prepara- SIO2-A1
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