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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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Corrosion of Nickel Alloys in Elevated Temperature Sour Gas Environments

Product Number: 51317--9135-SG
ISBN: 9135 2017 CP
Author: Robert Rettew
Publication Date: 2017
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Test results for four alloys in six different sour environments are presented. Alloys 625, 825, 316L and carbon steel were testing in sour gas with varying exposure to moisture at 280°C. Corrosion rates for each alloy over a 30 day period are measured from mass and thickness changes.
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