The Effect of Cold-Worked Ratio on Corrosion Behavior of T8 Tempered Al-si-mg/Sicp Metal Matrix Composites
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Date
2007
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International Committee on Composite Materials
Abstract
The corrosion behaviors of T8 tempered Al-Si-Mg/SiCp metal matrix composites (MMCs) were investigated in aerated and deaerated 3.5wt% NaCl solutions by potentiodynamic polarization technique in this study. In order to determine the effect of cold work on the electrochemical behavior, the composites were cold-worked to a plastic strain of 4, 6, 10, 25 and 50%. A major change in the corrosion morphologies were observed cold working ratio increased from 4 to 50%. For example, electrochemical analysis indicated that the corrosion current densities (icor) of 20% vol. SiC composite increased from 0.8 to 5.9 with increasing cold-worked ratio after T8 temper. In addition, we find that there is a significant coloration between corrosion susceptibility and level of cold work.
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Keywords
Cold Working, Corrosion, Metal Matrix Composite, Sic Particle, T8 Temper
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ICCM International Conferences on Composite Materials