The Corrosion of 6061Aluminum Alloy-Thornel 50Graphite Composite in Distilled Water and NaCl Solution.

摘要

The corrosion behavior of a 6061 aluminum alloy-Thornel 50 graphite composite has been examined in both distilled water and 3.5% NaCl solution at three temperatures: 298K (25C), 323K (50C), and 348K (75C). The corrosion rate was determined by the weight change and was monitored for times up to 1000 hr. The corrosion rates were maximum immediately after the initial immersion and decreased with increasing time of exposure. The NaCl solution was far more corrosive than the distilled water, and increasing the temperature resulted in an increased corrosion rate. The mode of attack appears to be crevice corrosion promoted by galvanic coupling between the aluminum matrix and graphite fibers.