Electrochemical behavior of Yttria stabilized thermal barrier. | [Proceedings of Pakistan Academy of Sciences • 2012]

Author(s):

1. M. Farooq: Institute of Chemical Engineering & Technology, University of the Punjab, Lahore 54590, Pakistan

2. K. M. Deen: Department of Metallurgy and Materials Engineering, CEET, University of the Punjab, Lahore 54590, Pakistan

3. S. Naseem: Center of Solid State Physics, University of the Punjab, Lahore 54590, Pakistan

4. S. Alam: Pakistan Council of Scientific & Indstrial Research (PCSIR), Lahore, Pakistan

5. R. Ahmad: Department of Metallurgy and Materials Engineering, CEET, University of the Punjab, Lahore 54590, Pakistan

6. A. Imran: Pakistan Council of Scientific & Indstrial Research (PCSIR), Lahore, Pakistan

Abstract:

The plasma sprayed Yttria stabilized thermal barrier coating electrochemical behavior was Electrochemical Impedance Spectroscopy (EIS) methods at room temperature. Thermal properties of applied coating after 600 hours exposure in 3.5% NaCl solution demonstrated 0.5% weight loss at about constant analysis revealed that the open circuit potential became positive after 600 hours compared to 0 hour with decrease in polarization resistance. The 28% decrease in charge density after 600 hours exposure in 3.5% NaCl solution was in support to decrease in polarization resistance. The decrease in charge transfer resistance was attributed to the ingress of chloride ions at the coating metal interface and localized corrosion reactions.

Page(s): 235-240

DOI: DOI not available

Published: Journal: Proceedings of Pakistan Academy of Sciences, Volume: 49, Issue: 4, Year: 2012

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