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Through a statistically designed, controlled environment experiment, it was found that atmospheric levels of sulfur dioxide induce a type of stress-accelerated intergranular corrosion in 7005-T53 aluminum alloy extruded tube material. Varying levels of nitrogen dioxide, ozone, relative humidity, and their interactions (including those with sulfur dioxide) did not cause statistically significant damage in this particular experiment. Some level of stress was necessary to cause this type of attack.
stress corrosion, crack propagation, intergranular corrosion, aluminum alloys, experimental design, air pollution, sulfur dioxide
Environmental engineer, Environmental Protection Agency, Environmental Research Center, Research Triangle Park, N. C.