MSA-CALLERY CHEMICAL COMPANY MASS TRANSFER PROGRAM SUMMARY
Mass transfer tests in forced-circulation, poly-metallic loops were conducted at operating temperatures of 1200 and 1450 deg F in an effort to evaluate various system materials in a high-temperature liquid-metal environment. Liquid NaK (Na-56%, K-44%) velocities of 30 feet per second on the test side of the heat exchanger and 20 feet per second in the primary cooler were used throughout the series. Heat fluxes of 150,000 and 300,000 Btu/hr sq ft were approximated during operation of these tests. The duration of the seven tests varied from a minimum of 340 hours for the high-temperature loops to a maximum of 1200 hours with a low-temperature loop. Oxygen content in the test-circuits was maintained at approximately 0.003% by weight. This was accomplished by means of a partial-flow, cold-trapping circuit. The extent of corrosion in the heat exchanger was observed to be a function of the temperature level in this portion of the test circuit. The extent of deposition, however, appeared to be a function of temperature difference. Because of the lack of consistency in the data obtained at various heat fluxes, it was not possible to evaluate the effect that heat flux has on corrosion. The maximum observed attack-rate in the Inconel hot leg was 4.5 mils per month of continuous operation and the maximum of observed deposition-rate in the primary coolers associated with these test circuits was 7.5 mils per month. The maximum observed attack-rate in the Hastelloy-X hot-leg loops was 3 mils per month and the maximum observed deposition in the primary coolers associated with these Hastelloy-X loops was approximately 3.5 mils per month. Most of the attack in the hot legs of the loops tested appeared to be of a selective nature; occurring as either a leached zone or a grain boundary corrosion. Photomicrographic and radiochemical evidence seems to indicate that the mass transferred material is composed of selectively leached chromium and tantalum from the parent alloy. (auth)
- Research Organization:
- Pratt and Whitney Aircraft Div., United Aircraft Corp. Connecticut Aircraft Nuclear Engine Lab., Middletown
- DOE Contract Number:
- AT(11-1)-229
- NSA Number:
- NSA-16-015146
- OSTI ID:
- 4783526
- Report Number(s):
- PWAC-203
- Resource Relation:
- Other Information: Orig. Receipt Date: 31-DEC-62
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CHROMIUM
CHROMIUM ALLOYS
COBALT ALLOYS
CORROSION
EFFICIENCY
GRAIN BOUNDARIES
HEAT EXCHANGERS
HEAT TRANSFER
HIGH TEMPERATURE
LEACHING
LIQUID METALS
MATERIALS TESTING
METALLOGRAPHY
NICKEL ALLOYS
OXYGEN
PHOTOGRAPHY
PIPES
POTASSIUM ALLOYS
QUANTITY RATIO
RADIOCHEMISTRY
SODIUM ALLOYS
TANTALUM
TEMPERATURE
VELOCITY
ZONES