CORROSION OF METALS AND ALLOYS BY FLUORINE. Final Report
The corrosion of twenty-five metals and alloys by liquid and gaseous fluorine was studied. The liquid corrosion tests were performed at --320 tained F and exposure ranged from 5 hours to 3 days. Expcsures to gaseous fluorine were made at apprcximately 80, 400, 700, and 1000 tained F. Expcsure times were generally 5, 24, and 120 hours. Several specimens were also expcsed to gaseous fluorine at elevated pressures and temperatures for 24 hours. Selected specimens were sectioned and photomicrographs taken to study the passivating fluoride film. Results of the five-hour tests indicate that all tested materials, except tantalum, may be exposed to fluorine at temperatures up to 400 tained F without exceeding a corrcsion rate of one-half thousandth of an inch (0.0005'') per hour. This arbitrarily chosen rate is not intended to signify acceptability. It is equivalent to 4.4 inches per year, which is an extremely high corrosion rate under normal circumstances, but not excessive when exposure for only a few hours is required. Tests indicate that extrapolation of the results obtained from very short exposures to long time service, such as a year, is not reliable. In general, the corrcsion rates tend to decrease as the exposure pericd is increased. Tests of materials at elevated pressures indicate that corrcsion rates are generally higher than specimens exposed to the same temperatures at atmospheric pressure. Microscopic examination of selected specimens shows that materials such as monel and nickel form a relatively uniform passivating film at elevated temperatures. Aluminum 1100, however, shows indication of deep, non-uniform penetration. These and other materials are fully discussed. (auth)
- Research Organization:
- Allied Chemical Corp. General Chemical Div., New York
- Sponsoring Organization:
- US Atomic Energy Commission (AEC)
- NSA Number:
- NSA-14-019375
- OSTI ID:
- 4176769
- Report Number(s):
- NP-8845
- Country of Publication:
- United States
- Language:
- English
Similar Records
Temperature requirements and corrosion rates in combustion driven hydrogen fluoride supersonic diffusion lasers
CORROSION OF AN ALUMINUM-NICKEL ALLOY IN A REACTOR TEST LOOP