Electrochemical behavior of zirconia based coatings on mild steel prepared by sol–gel method

► Sol–gel zirconia based coatings deposited on MS with a prior conversion coating. ► Conversion coating comprised of composite oxides of iron and aluminum. ► It provided temporary protection to MS and suitable template for sol–gel coating. ► Sol–gel zirconia based coatings provided barrier type prot...

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Bibliographic Details
Published in:Corrosion science 2012-10, Vol.63, p.334-341
Main Authors: Tiwari, S.K., Tripathi, Manju, Singh, Raghuvir
Format: Article
Language:English
Subjects:
A. Mild steel
Applied sciences
B. EIS
B. SEM
B. X-ray diffraction
C. Oxide coatings
Carbon steels
Coatings
Conversion coating
Corrosion
Corrosion environments
Corrosion prevention
Exact sciences and technology
Metals. Metallurgy
Nonmetallic coatings
Production techniques
Scanning electron microscopy
Sol gel process
Surface treatment
Yttria stabilized zirconia
Zirconium dioxide
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Summary:► Sol–gel zirconia based coatings deposited on MS with a prior conversion coating. ► Conversion coating comprised of composite oxides of iron and aluminum. ► It provided temporary protection to MS and suitable template for sol–gel coating. ► Sol–gel zirconia based coatings provided barrier type protection to MS. ► Sol–gel coatings reduced icorr of MS in 3.5wt.% NaCl by 4 orders of magnitude. Sol–gel zirconia, yttria stabilized zirconia (YSZ) and alumina stabilized zirconia (AlSZ) coatings were deposited on mild steel to improve its corrosion resistance properties. A suitable conversion coating, prior to the sol–gel zirconia based coating was applied to minimize the interference of non-protective rust. X-ray diffraction (XRD), Fourier Transform Infrared (FT-IR) and scanning electron microscopy (SEM) were used to characterize the coatings. The electrochemical corrosion behavior of the coatings was evaluated in 3.5wt.% NaCl by potentiodynamic polarization and electrochemical impedance techniques. The sol–gel coatings exhibited barrier type protection of the substrate.
ISSN:0010-938X
1879-0496
DOI:10.1016/j.corsci.2012.06.026