SOLUTION CORROSION GROUP QUARTERLY REPORT FOR THE PERIOD ENDING JANUARY 31, 1956
A number of loop runs were made in order to determine how much H/sub 2/ SO/sub 4/ is necessary to stabilize 0.04 m UO/sub 2/SO/sub 4/ solutions containing 0.005 m CuSO/sub 4/ at 300 deg C (HRT conditions) and to determine the corrosiveness of such solutions in the temperature range of 200 to 300 deg C. It was demonstrated that 0.01 m H/sub 2/SO/sub 4/ is not sufficient to prevent hydrolytic precipitation of Cu and U and that 0.02 m is suf ficient. Future tests may indicate that less than 0.02 m H/sub 2/SO/sub 4/ will be adequate. At 300 deg C corrosion of stainless steel is not serious, even with 0.02 m H/sub 2/ SO/sub 4/ up to flow rates of 45 fps. However, at 200 to 250 deg C corrosion is more serious, and critical velocities as low as 15 to 20 fps were observed. Preliminary corrosion tests in a UO/sub 2/(CO/sub 3/)/sub 2/austenitic and ferritic stainless steels were low, in most cases lower than the rates observed in comparable UO/sub 2/SO/sub 4/ systems. In addition, carbon steel, which is completely dissolved by Further testing with highly concentrated UO/sub 2/SO/sub 4/ solutions containing added Li/sub 2/SO/sub 4/ confirmed previous results concerning the beneficial effects of the Li/sub 2/SO/sub 4/ on the corrosion of stainless steel. One loop run was with 3.8 m UO/sub 2/SO/sub 4/ and 3.8 m Li/sub 2/SO/sub 4/ at 350 deg C and showed the absence of a critical velocity up to 70 fps. Other runs made in toroids gave results similar to those obtained in loop runs. One series of toroid runs demonstrated that Ce/sub 2/SO/sub 4/ was at least as effective as Li/sub 2/SO/sub 4/ and perhaps even more effective. However, both loop and autoclave tests failed to demonstrate the abnormally low vapor pressure previously reported for such solutions. At present. there is no explanation for the erroneous results given in the last quarterly report. Static corrosion tests showed that type 1515N stainless steel has a corrosion resistance to UO/sub 2/SO/sub 4/ solutions about equal to that of type 347 stainless steel. On the other hand. an antigalling type alloy, designated as Waukesha Metal No. 88. was badly attacked (43 mpy) by rosion was also severe (32 mpy). Studies with Iso-Elastic spring alloy which had been Au-plated were carried out. At imperfections in the gold plate, attack was severe enough to allow the gold to peel off. Preliminary tests with another spring alloy. Elgiloy, showed it to be much more resistant than Iso-Elastic and indicated that it may be superior to Iso-Elastic for use in the pressurizer liquidlevel controller. (auth)
- Research Organization:
- Oak Ridge National Lab., Tenn.
- DOE Contract Number:
- W-7405-ENG-26
- NSA Number:
- NSA-12-000865
- OSTI ID:
- 4330227
- Report Number(s):
- CF-56-1-167
- Resource Relation:
- Other Information: Decl. Apr. 12, 1957. Orig. Receipt Date: 31-DEC-58
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
AUSTENITE
CARBON STEELS
CARBONATES
CERIUM SULFATES
CONTROL ELEMENTS
COPPER
COPPER SULFATES
CORROSION
DECOMPOSITION
GOLD
LEVELS
LIQUIDS
LITHIUM CARBONATES
LITHIUM SULFATES
MATERIALS TESTING
PIPES
PLATING
PRECIPITATION
PRESSURE
PRESSURE VESSELS
QUANTITATIVE ANALYSIS
SOLUTIONS
STABILITY
STAINLESS STEELS
SULFATES
SULFURIC ACID
TEMPERATURE
URANIUM
URANYL COMPOUNDS
VAPORS
VELOCITY
WATER