Abstract
The corrosion behavior of three lots of annealed sheet material was compared with that of 380 aluminum die‐casting alloy using four accelerated corrosion test environments: 100% relative humidity at 120°F, 100% relative humidity at 120°F plus a trace of ammonia, 100% relative humidity at 120°F plus 100 ppm sulfur dioxide, and alternate immersion in sodium 31/2% chloride solution at room temperature. Corrosion rates of the materials as measured by weight change and metallographic evidence of subsurface attack were considerably less than observed in the 380 aluminum diecasting alloy. Intergranular attack was observed extending 2–4 mils beneath the surface in the material exposed to high‐humidity environments except when sulfur dioxide was present. Intergranular attack appeared related to the presence of a zinc‐rich grain‐boundary phase. Although the corrosion behavior of material was not affected in most cases by exposure under stress, one material which was relatively free of intergranular attack when exposed without stress developed cracks when exposed under stress.
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