Rapid corrosion of a Type 347 stainless steel-clad tank was encountered in the storage of a mixed acid of the composition 85 percent nitric acid-13.5 percent sulfuric acid-1.5 percent water. A laboratory investigation of the mechanisms of attack in this and similar acids shows severe vapor-phase corrosion of austenitic stainless steel above 95 percent total acidity. The attack was unaffected by chloride or metal ion contamination. 1100 aluminum has been found in both laboratory tests and in field experience to be an effective and economical substitute in this service. The aluminum alloy is corroded in the liquid phase at total acidities below 95 percent. 4.3.2

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Copyright 1956 by the National Association of Corrosion Engineers.
1956
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