Preparation and characterization of sol–gel derived yttria doped zirconia coatings on AISI 316L

Tiwari, S K and Adhikary, Jhuma and Singh, T B and Singh, Raghuvir (2009) Preparation and characterization of sol–gel derived yttria doped zirconia coatings on AISI 316L. Thin Solid Films, 517 (16). pp. 4502-4508.

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A stable 4 mol% yttria-stabilized zirconia (YSZ) sol has been synthesized for coating stainless steel AISI 316L for biomedical applications. The sol was prepared by controlled hydrolysis of zirconium n-butoxide using acetylacetone and nitric acid as chelating agent and catalyst, respectively. X-ray diffractograms of calcined YSZ xerogel indicated a tetragonal structure at temperature as low as 400 °C. Stainless steel was dip-coated in transparent yellow YSZ sol followed by heat treatment between 400 and 600 °C for 2 h in air. A homogeneous and crack-free YSZ film was, thus, obtained on the stainless steel surface. Adhesion strength, measured by scratch test in progressive loading sequence on coated AISI 316L, showed 27 ± 3 N critical load. Corrosion performance of the surface coating was evaluated through open-circuit potential (OCP) measurement, impedance, polarization and chronoamperometry in Ringer's solution at 37 °C. The coating enhanced the pitting potential of the substrate. The metal ions released from AISI 316L was effectively controlled by the coating.

Item Type:Article
Official URL/DOI:
Uncontrolled Keywords:Stainless steel; Coating; Sol–gel; Zirconia; Corrosion resistance; Bioimplant; Yttria stabilized zirconia; Annealing; X-ray diffraction; Electrochemical impedance spectroscopy; Scanning electron microscopy
Divisions:Corrosion and Surface Engineering
ID Code:669
Deposited By:Sahu A K
Deposited On:02 Jun 2010 12:18
Last Modified:17 Feb 2012 16:50
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