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11249 Electrochemical and Microstructural Response of Metal Matrix Composites at Different Erosion-Corrosion Conditions

Picture for 11249 Electrochemical and Microstructural Response of Metal Matrix Composites
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Product Number: 51300-11249-SG
ISBN: 2011 11249 CP
Author: Juan. F. Flores, A. Neville, N. Kapur, A. Gnanavelu
Publication Date: 2011
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The electrochemical and microstructural response of metal matrix composites (MMCs) under different erosion-corrosion conditions is assessed in this paper. The MMCs are plasma transferred arc (PTA) overlays, produced by reinforcing two iron base and two nickel base hardfacing matrices with tungsten carbide (WC) particles. The microstructures are examined using scanning electron microscopy (SEM) and stereology techniques. The electrochemical response under erosioncorrosion conditions, assessed by in-situ potentiodynamic techniques, is analyzed as a function of sand content (10 and 50 g/l) and slurry temperature (20 and 65°C). The degradation mechanisms of the MMCs microstructural components are analyzed by SEM. The microstructural analysis showed that WC grains were partially dissolved in the molten matrix, promoting the formation of secondary phases in the matrix phase. The in-situ electrochemical results show that there is a correlation between the MMCs microstructural characteristics and their electrochemical response and that the nickel base MMC, shows significantly lower current density values at all sand content. On the other hand, the iron base MMC showed a fully active behavior at all erosion-corrosion conditions. Finally the erosion-corrosion tests in conjunction with post-test surface analysis demonstrates that as the sand content and temperature increases under erosion-corrosion conditions, every microstructural component is significantly affected and the corrosion of the matrix undermined the WC grains and the integrity of the secondary phases.

Keywords: Erosion-corrosion, metal matrix composites, microstructure, tungsten carbide.
The electrochemical and microstructural response of metal matrix composites (MMCs) under different erosion-corrosion conditions is assessed in this paper. The MMCs are plasma transferred arc (PTA) overlays, produced by reinforcing two iron base and two nickel base hardfacing matrices with tungsten carbide (WC) particles. The microstructures are examined using scanning electron microscopy (SEM) and stereology techniques. The electrochemical response under erosioncorrosion conditions, assessed by in-situ potentiodynamic techniques, is analyzed as a function of sand content (10 and 50 g/l) and slurry temperature (20 and 65°C). The degradation mechanisms of the MMCs microstructural components are analyzed by SEM. The microstructural analysis showed that WC grains were partially dissolved in the molten matrix, promoting the formation of secondary phases in the matrix phase. The in-situ electrochemical results show that there is a correlation between the MMCs microstructural characteristics and their electrochemical response and that the nickel base MMC, shows significantly lower current density values at all sand content. On the other hand, the iron base MMC showed a fully active behavior at all erosion-corrosion conditions. Finally the erosion-corrosion tests in conjunction with post-test surface analysis demonstrates that as the sand content and temperature increases under erosion-corrosion conditions, every microstructural component is significantly affected and the corrosion of the matrix undermined the WC grains and the integrity of the secondary phases.

Keywords: Erosion-corrosion, metal matrix composites, microstructure, tungsten carbide.
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