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02517 Measurement and Calculation of Electrochemical Potentials in Hydrogenated High Temperature Water, including an Evaluation of the Yttria-Stabilized...

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Product Number: 51300-02517-SG
ISBN: 02517 2002 CP
Author: Steven A. Attanasio, David S. Morton, and Mark A. Ando
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The importance of knowing the electrochemical corrosion potential (ECP, also referred to as Ecorr) of nickel-base alloys in hydrogenated water is related to the need to understand the effects of dissolved (i.e., aqueous) hydrogen concentration ([H2]) on primary water stress corrosion cracking (PWSCC). Also, the use of a reference electrode (RE) can improve test quality by heightening the ability to detect instances of out-of-specification or unexpected chemistry. Three methods are used to measure and calculate the ECP of nickel-based alloys in hydrogenated water containing ~ 1 to 150 scc/kg H2 (0.1 to 13.6 ppm H2) at 260 to 360°C. The three methods are referred to as the specimen/component method, the platinum (Pt) method, and the yttria-stabilized zirconia/iron-iron oxide (YSZ/Fe-Fe3O4) RE method. The specimen/component method relies upon the assumption that the specimen or component behaves as a hydrogen electrode, and its Ecorr is calculated using the Nemst equation. The present work shows that this method is valid for aqueous...
The importance of knowing the electrochemical corrosion potential (ECP, also referred to as Ecorr) of nickel-base alloys in hydrogenated water is related to the need to understand the effects of dissolved (i.e., aqueous) hydrogen concentration ([H2]) on primary water stress corrosion cracking (PWSCC). Also, the use of a reference electrode (RE) can improve test quality by heightening the ability to detect instances of out-of-specification or unexpected chemistry. Three methods are used to measure and calculate the ECP of nickel-based alloys in hydrogenated water containing ~ 1 to 150 scc/kg H2 (0.1 to 13.6 ppm H2) at 260 to 360°C. The three methods are referred to as the specimen/component method, the platinum (Pt) method, and the yttria-stabilized zirconia/iron-iron oxide (YSZ/Fe-Fe3O4) RE method. The specimen/component method relies upon the assumption that the specimen or component behaves as a hydrogen electrode, and its Ecorr is calculated using the Nemst equation. The present work shows that this method is valid for aqueous...
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