Abstract
Zirconium coatings of different thicknesses have been deposited at 773 K on 9Cr-1Mo steel substrate using pulsed DC magnetron sputtering. These coatings were heat treated in vacuum at two different temperatures (1173 and 1273 K) for one hour. X-ray diffraction (XRD) analysis of Zr-coated samples revealed the formation of α-phase (HCP structure) of Zr. XRD analysis of heat-treated samples show the presence of Zr3Fe and Zr2Fe intermetallics. The lattice parameter of these coatings was calculated, and it matches with the bulk values when the thickness reached 2µm. In order to understand this, crystallite size and strain values of these coatings were calculated from XRD plots employing Williamson-Hall method. In order to assess the performance of the coatings, systematic corrosion tests were carried out. The corrosion current density calculated from the polarization behavior showed that the corrosion current density of the uncoated 9Cr-1Mo steel was higher than the coated sample before and after the heat treatment. Studies using electrochemical impedance spectroscopy confirmed that the coated steel has higher impedance than the uncoated steel. The corrosion resistance of 9Cr1Mo steel had improved after Zr coating. However, the corrosion resistance of the coating after heat treatment decreased when compared to the as-deposited coating. The microstructure and composition of the surface oxide film influence the corrosion resistance of the Zr-coated 9Cr1Mo steel.
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The authors thank Smt M.Jyothi, Foreman (A), MSSCD, IGCAR for support during experimental stages of the current studies. Further, we thank Dr. M. Vijayalakshmi, Associate Director, PMG, Dr. A. K. Bhaduri, Director, MMG and Dr. S.A.V. Satya Murty, Director, IGCAR for their continuous support and encouragement.
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Singh, A., Murugesan, S., Parameswaran, P. et al. Characterization and Performance of Magnetron-Sputtered Zirconium Coatings Deposited on 9Cr-1Mo Steel. J. of Materi Eng and Perform 25, 4666–4679 (2016). https://doi.org/10.1007/s11665-016-2318-7
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DOI: https://doi.org/10.1007/s11665-016-2318-7