Improving Corrosion Resistance of 316L Austenitic Stainless Steel Using ZrO{sub 2} Sol-Gel Coating in Nitric Acid Solution
- Malayer University, Department of Materials Engineering, Faculty of Engineering (Iran, Islamic Republic of)
In this study, thin-film coating of zirconium oxide (ZrO{sub 2}) was prepared by sol-gel method and subsequent heat treatment process. The sol was prepared by controlled hydrolysis of zirconium tetrapropoxide using acetic acid and ethanol/acetylacetone mixture as catalyst and chelating agent, respectively, and finally deposited onto the 316L austenitic stainless steel (316L SS) using dip coating method in order to improve its corrosion resistance in nitric acid medium. The composition, structure, and morphology of the coated surface were investigated by x-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and atomic force microscopy (AFM). The obtained results from XRD and FTIR state the formation of tetragonal and monoclinic ZrO{sub 2} phase. Also, the obtained results from surface morphology investigation by SEM and AFM indicate the formation of smooth, homogeneous and uniform coatings on the steel substrate. Then, the corrosion behavior of stainless steel was investigated in a 1 and 10 M nitric acid solutions using electrochemical impedance spectroscopy and linear polarization test. The obtained results from these tests for ZrO{sub 2}-coated specimens indicated a considerable improvement in the corrosion resistance of 316L stainless steel by an increase in corrosion potential and transpassive potential, and a decrease in passive current density and corrosion current density. The decrease in passive current density in both the concentration of solutions was two orders of magnitude from bare to coated specimens.
- OSTI ID:
- 22858035
- Journal Information:
- Journal of Materials Engineering and Performance, Vol. 27, Issue 3; Other Information: Copyright (c) 2018 ASM International; http://www.springer-ny.com; Country of input: International Atomic Energy Agency (IAEA); ISSN 1059-9495
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ATOMIC FORCE MICROSCOPY
CATALYSTS
CORROSION RESISTANCE
CURRENT DENSITY
DIP COATING
ELECTROCHEMISTRY
FOURIER TRANSFORM SPECTROMETERS
FOURIER TRANSFORMATION
HEAT TREATMENTS
INFRARED SPECTRA
MONOCLINIC LATTICES
SCANNING ELECTRON MICROSCOPY
SOL-GEL PROCESS
SPECTROSCOPY
STAINLESS STEEL-316L
SUBSTRATES
THIN FILMS
X-RAY DIFFRACTION
ZIRCONIUM OXIDES