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| PERFORMANCE OF EROSION-RESISTANT CERAMIC COATINGS DEPOSITED BY PLASMA SPRAYING |
| LI Shoubiao1,2, XU Likun2, SHEN Chengjin1, LI Xiangbo2 |
1. School of Materials Science and Engineering, China University of Mining & Technology, Xuzhou 221116
2. State key Laboratory for Marine Corrosion and Protection, Luoyang Ship Materials Research Institute,Qingdao 266101 |
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Abstract Al2O3-13%TiO2 and Cr2O3•5SiO2•3TiO2 erosion-resistant ceramic coatings were deposited on Al-bronze alloy using plasma spraying process. The morphologies of the two coatings were investigated by means of scanning electron microscope (SEM) and laser scanning microscope (LSM). Microhardness and adhesion strength have been evaluated, respectively. The corrosion behavior of two coatings in 3.5% NaCl solution were characterized by potentiodynamic polarization and electrochemical impedance spectroscopy. SEM analysis of corroded surface and weight loss technique were used to study the erosion-corrosion of coated samples and uncoated sample in flowing seawater. The results indicated that Cr2O3•5SiO2•3TiO2 coating has a much dense microstructure and the laminar microstructure was not obviously observed. The corrosion behavior of ceramic coatings was mainly related to the porosity of the coatings. Due to higher microhardness and adhesion strength, the weight loss of Cr2O3•5SiO2•3TiO2 coated sample was nearly 1/9 of that of uncoated one, indicating better resistance to erosion-corrosion in flowing seawater than Al2O3-13%TiO2 coating.
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Received: 09 October 2010
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Corresponding Authors:
XU Likun
E-mail: xulk@sunrui.net
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