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In order to investigate the role of silicon carbide in microgalvanic corrosion of magnesium-based metal matrix composites (MMCs), a high-purity MMC was specially prepared by magnetron sputtering magnesium on to a substrate surface impregnated with silicon carbide particles. The corrosion of the model MMC was then studied by microscopic examination following immersion for up to 36 h in 3.5 wt% NaCl...
The corrosion of a magnesium-based MMC, comprising a ZC71 alloy matrix and 12 vol% silicon carbide particles, has been studied in saline environments, using salt-spray and electrochemical tests. Corrosion was localized initially, and developed subsequently into general corrosion, the local corrosion rate being about three times faster than that of conventional ZC71 alloy due to the formation of less...
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