SCWR Information Meeting April 29-30, 2003 Corrosion Studies at MIT D.B. Mitton, H. Kim and R.M....
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Transcript of SCWR Information Meeting April 29-30, 2003 Corrosion Studies at MIT D.B. Mitton, H. Kim and R.M....
SCWR Information Meeting April 29-30, 2003
Corrosion Studies at MIT
D.B. Mitton, H. Kim and R.M. Latanision
Scanning Laser Micrograph and Surface Profile of I-625 (300˚C, 288 h, non-deaerated 15 mega ohm water)
Surface Profile
Pit diameter ≈ 19 µm Pit depth ≈ 4.4 µm
Scanning Laser Micrograph of I-625 Under a Washer (300˚C, 288 h, non-deaerated 15 mega ohm water)
Surface Profile
Pit diameter ≈ 12 µm Pit depth ≈ 2 µm
Instrumented Tube Tests
Heaver oxide formation at locations above the pseudo critical temperature
The oxide formation was significantly heavier for the 316 than for the 625 samples
Increased chromium concentration within the oxide formed above the critical point for alloy 625 – this phenomenon is not observed for the 316 stainless steel tube
Exposure Coupons
Minor pitting of the Alloy-625 samples at 300°C
Pitting of both the 316 stainless steel and the Alloy-625 samples was observed at 400°C
Oxide development for Alloy-625 and 316 samples at 500°C - the oxide formation was significantly heavier for the 316 stainless steel than for the Alloy-625 samples
Serious corrosion was observed at the periphery of a ceramic spacer for 316 stainless steel exposed at 500˚C for 96 hours
Summary