CORROSION BEHAVIOUR OF 10197 ALUMINUM-NIKCEL-IRON ALLOY IN HIGH-TEMPERATURE WATER UNDER DYNAMIC CONDITIONS
Under optimum conditions specimens of 10197 aluminum alloy (2 wt.% Ni, 1/ 2 wt.% Fe, 0.2 wt.% Si, 0.2 wt.% Ti, 0.05 wt.% Be. 0.05 wt.% Zr) corroded at about 5 x 10/sup -3/ inches/ year in deionized water at 260'C and 20 ft/sec linear velocity. Corrosion was considerably reduced for specimens given a prefilming in static water at 300'C prior to the dynamic test. but no reduction in corrosion rate resulted from techniques aimed at increasing the concentration of dissolved aluminum oxide in the loop water. The measurements confirmed previous observations that dynamic rates are dependent on the area of aluminum alloy in the loop, and upon the location of the specimens. In different regions of the loop. simultaneous corrosion rates were observed which differed by a factor of approximately 10. It was also shown that the corrosion rate was time- dependent; specimens added at intermediate stages of a test showed higher initial corrosion rates than the original specimens. For the particular loop used, it was further demonstrated that the dynamic rate had increased steadily over a 1500 hour period. eventually arriving at a stable condition in which the corrosion rate was the 5 x 10/sup -3/ inches/year cited above. It was not found possible to explain these phenomena satisfactorily, though it appears that they must be due to changes in water composition. (auth)
- Research Organization:
- Atomic Energy of Canada Ltd., Chalk River, Ont.
- NSA Number:
- NSA-14-015939
- OSTI ID:
- 4138421
- Report Number(s):
- CRMet-882; AECL-1006
- Country of Publication:
- Canada
- Language:
- English
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