The Effect of Microstructure on the Corrosion and Stress Corrosion Cracking of Alloy 600 in Acidic and Neutral Environments
- 1 January 1986
- journal article
- Published by Association for Materials Protection and Performance (AMPP) in Corrosion
- Vol. 42 (1) , 15-27
- https://doi.org/10.5006/1.3584874
Abstract
This paper presents a study of corrosion and stress corrosion cracking (SCC) of Alloy 600. The primary purpose of this work is to relate the corrosion susceptibility of the alloy after various heat treatments to the microstructure produced by these heat treatments. Three commercial alloys and three laboratory alloys were used. Corrosion susceptibility was evaluated with the 25% boiling nitric acid test. Stress corrosion susceptibility was determined by tests in 288 C water containing either 0.2 or 8 ppm of oxygen. It was found that grain boundary chromium depletion resulting from the growth of grain boundary carbides caused the alloy to be very susceptible to corrosion and SCC in both environments. If the chromium depletion was accompanied by phosphorus segregation, the corrosion in the nitric acid test was very severe; however, phosphorus segregation alone did not cause significant corrosion. It also appears that phosphorus segregation did not play a major role in determining the outcome of the ...Keywords
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