CORROSION OF MATERIALS IN LITHIUM HYDROXIDE SOLUTION AT 600 F FOR 1500 HOURS
Technical Report
·
OSTI ID:4331653
Corrosion of STR materials, in general was less in lithium hydroxide solution at 600 deg F than was reported for exposure at 500 deg F in SFR reference water containing 1 to 5 ppm NH/sub 3/. Stainless steels 304 annealed, 347 annealed, and 347 sensitized all exhibited approximately the same total (descaled) corrosion of approximately 23 mg/dm/sup 2/ on exposure for 1500 hr. These results should be compared with total corrosions after 1500 hr in SFR reference water of 97, 90, and 78 mg/dm/sup 2/, respectively, for these materials. Type 410 stainless steel was the poorest STR material tested with the exception of copper; however, in lithium hydroxide the total weight loss of 410 SS was 65 mg/dm/sup 2/ after 1500 hr compared with 77 mg/dm/sup 2/ in SFR reference water. Copper was the only material tested which did not show a reduction in corrosion rate as the test progressed. For this material the lowest weight loss (2.6 mg/dm/ sup 2/) was observed during the first 250 hr of exposure and was followed by a sharp rise to a total weight loss of 99.7 mg/dm/sup 2/ at 1500 hr. Carbon steel corrosion for all specimens was characterized by rapid attack and scale build-up during the first 250-hr period. This was followed by relatively mild corrosion during the remaining 1250 hr of the test. Monthly total corrosion rates during the first 250 hr period ranged from 729 mg/dm/sup 2//mo to 636 mg/dm/sup 2//mo. In the exposure period from 1000 to 1500 hr, the total corrosion rates ranged from 37.4 mg/dm/sup 2//mo to 11.5 mg/dm/sup 2//mo. The Croloys, chromium alloy steels, also exhibited rapid early attack followed by reduced later corrosion. The 1 1/4 and 2 1/4 chromium contained in Croloys CR-1 and CR-2 did not make these materials noticeably superior to carbon steels; however, the 5% chromium in CR-5 resulted in an alloy whose average corrosion was about 60% that of carbon steel. (auth)
- Research Organization:
- Westinghouse Electric Corp. Atomic Power Div., Pittsburgh
- NSA Number:
- NSA-13-000770
- OSTI ID:
- 4331653
- Report Number(s):
- WAPD-SFR-Ch-138
- Country of Publication:
- United States
- Language:
- English
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