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03675 The Effect of pH on Nickel Alloy SCC and Corrosion Performance

Picture for 03675 The Effect of pH on Nickel Alloy SCC and
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Product Number: 51300-03675-SG
ISBN: 03675 2003 CP
Author: D.S. Morton, and M Hansen
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Alloy X-750 condition HTH stress corrosion crack growth rate (SCCGR) tests have been conducted at 360°C (680°F) with 50 cc/kg hydrogen as a function of coolant pH. Results indicate no appreciable influence ofpH on crack growth in the pH (@ 360°C) range of -6.2 to 8.7, consistent with previous alloy 600 findings. These intermediate pH results suggest that pH is not a key variable which must be accounted for when modeling pressurized water reactor (PWR) primary water SCC. In this study, however, a nearly three fold reduction in X-750 crack growth rate was observed in reduced pH environments (pH 3.8 through HC1 addition and pH 4-5.3 through H2804 addition). Crack growth rates did not directly correlate with corrosion film thickness. In fact, 10x thicker corrosion films were observed in the reduced pH environments.
Alloy X-750 condition HTH stress corrosion crack growth rate (SCCGR) tests have been conducted at 360°C (680°F) with 50 cc/kg hydrogen as a function of coolant pH. Results indicate no appreciable influence ofpH on crack growth in the pH (@ 360°C) range of -6.2 to 8.7, consistent with previous alloy 600 findings. These intermediate pH results suggest that pH is not a key variable which must be accounted for when modeling pressurized water reactor (PWR) primary water SCC. In this study, however, a nearly three fold reduction in X-750 crack growth rate was observed in reduced pH environments (pH 3.8 through HC1 addition and pH 4-5.3 through H2804 addition). Crack growth rates did not directly correlate with corrosion film thickness. In fact, 10x thicker corrosion films were observed in the reduced pH environments.
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