In the Institute of Metals Division Lecture of 1940, E. H. Dix, Jr.(1) discussed the acceleration of the rate of corrosion by high constant stresses. Experimental data obtained on this subject at the Aluminum Research Laboratories and a theory compatible with these facts were included in that lecture. The present paper contains data and ideas subsequently developed at the Aluminum Research Laboratories.
This paper comprises a discussion of the aluminum-base alloy specimens exposed in the atmospheric corrosion tests conducted by the American Society for Testing Materials through Subcommittee VI on Atmospheric Corrosion, of Committee B-3 on Corrosion of Non-Ferrous Metals and Alloys. Also included are results of atmospheric exposure tests conducted by the Aluminum Research Laboratories with similar and additional aluminum alloys.
Although theoretical studies afford valuable information, simple practical tests are of marked assistance in predicting the resistance of materials to specific corrosive conditions. One of the oldest of these is the salt-spray. The authors believe much of its unpopularity results from uncontrolled variables and the lack of standardized procedures and they present data to show that the test is both useful and reliable when properly administered. The factors which they believe should be controlled are briefly discussed and “standard” conditions for each factor are suggested. However, the paper has been written to stimulate discussion of the test and promote more universal agreement on the testing methods used and is not intended as a “standard practice.”
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