Sol-Gel Coatings for Chemical Protection of Stainless Steel
Summary:
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. Sol-gel
methods are now widely used for the preparation of films
of oxide materials from solutions and offer
potential advantages over traditional techniques [ 1]
[2] [3] [4]. The chemical processing [5] and the technical
applications [6], which encompass optical,electronic,
optoelectronic, photonic, biotechnology, chemical and
mechanical fields have been reviewed recently.
Format:
Pages :6
Size: 563 kb
Author :PEDRO DE LIMA NETO, MOHAMED ATIK, LUIS A. AVACA
AND MICHEL A. AEGERTER
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