CORROSION OF VOLATILITY PILOT PLANT MARK I INOR-8 HYDROFLUORINATOR AND MARK III L NICKEL FLUORINATOR AFTER FOURTEEN DISSOLUTION RUNS
Process corrosion occurring in the current Volatility Pilot Plant hydrofluorinator and fluorinator in operation at the Oak Ridge National Laboratory was evaluated by visual inspections, chemical analyses, transport studies of Ni, Mo, Cr, and Fe, gamma radiography, wax replication, ultrasonic thickness measurements, and metallographic studies. The modes, mechanisms, and rates of corrosive attack seem to agree well with previous experimental work. Significant bulk metal losses and moderate pitting attack were noted in both vessels. Maximum attack in the hydrofluorinator, which operated from 650 to 500 deg C, occurred in the middle vapor region at a calculated corrosion rate of 20 mils/month, based on 765 hr of molten fluoride salt residence time, and 0.06 mil/ hr, based on 338.5 hr of hydrogen fluoride exposure time. The fluorinator, which operated at about 500 deg C, sustained maximum bulk metal losses in the lower vapor region at calculated rates of 28 mils/month, based on 694 hr of salt residence time, and 0.9 mil/hr, based on 30.9 hr of fluorine exposure time. Calculations based on losses in wall thickness indicate that both vessels should be capable of handling approximately 100 additional dissolution runs. These calculations include pitting corrosion in the hydrofluorinator but ignore effects resulting from intergranular or other forms of selective attack which may be present in both vessels. (auth)
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- DOE Contract Number:
- W-7405-ENG-26
- NSA Number:
- NSA-16-010455
- OSTI ID:
- 4810145
- Report Number(s):
- ORNL-3253
- Resource Relation:
- Other Information: Orig. Receipt Date: 31-DEC-62
- Country of Publication:
- United States
- Language:
- English
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