탄소강의 유동가속부식에 미치는 크롬의 영향
Effect of Cr on Flow Accelerated Corrosion of Carbon Steel
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The alloy content of structural materials of nuclear power plants has been recognized an important factorin predicting flow accelerated corrosion (FAC). In particular, many literature data reported that chromiumcontent is one of the most important alloying element and even a small amount of chromium is effectiveto suppress FAC. This report reviewed and compared chromium models of Ducreux, Bouchacourt, andKastner which were used in predicting FAC rates. The plant data indicate that Ducreux model may beconservative for the specimen containing 0.15 wt% chromium. The related articles were reviewed as follows. Combined effects of chromium content, pH, temperature, dissolved oxygen (DO), flow velocity, test time,and kinds of amine on the FAC rate were described. 0.1 wt% chromium in steel did not affect the FACrate with changes in pH. The FAC rates pronounced with higher flow rate and increased with increasingtest duration(600 d) for 0.013 wt% chromium. The FAC rates in mixed amine chemistry were higher thanin ammonia chemistry, which may be lessened by the addition of chromium to the steel.
Abstract
The alloy content of structural materials of nuclear power plants has been recognized an important factorin predicting flow accelerated corrosion (FAC). In particular, many literature data reported that chromiumcontent is one of the most important alloying element and even a small amount of chromium is effectiveto suppress FAC. This report reviewed and compared chromium models of Ducreux, Bouchacourt, andKastner which were used in predicting FAC rates. The plant data indicate that Ducreux model may beconservative for the specimen containing 0.15 wt% chromium. The related articles were reviewed as follows. Combined effects of chromium content, pH, temperature, dissolved oxygen (DO), flow velocity, test time,and kinds of amine on the FAC rate were described. 0.1 wt% chromium in steel did not affect the FACrate with changes in pH. The FAC rates pronounced with higher flow rate and increased with increasingtest duration(600 d) for 0.013 wt% chromium. The FAC rates in mixed amine chemistry were higher thanin ammonia chemistry, which may be lessened by the addition of chromium to the steel.
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