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07499 Hydrogen Entry Mechanism for API X-65 Steel Exposed in Near Neutral Solutions under Adsorption-Activation Conditions

Product Number: 51300-07499-SG
ISBN: 07499 2007 CP
Author: Homero Castaneda and Brian N. Leis
Publication Date: 2007
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Hydrogen-related attack is a specific mechanism that can contribute to SCC (Stress Corrosion Cracking), through its influence on internal stress and the microstructure due to atomic hydrogen concentration diffused and accumulated during operation conditions due to the formation of atomic hydrogen in presence and absence of polarization conditions (cathodic protection). In this work, an API X-65 grade steel pipeline is exposed to NS4 synthetic groundwater solution in hydrogen permeation cell type experiments in order to follow the hydrogen reaction in the cathodic compartment and to characterize the total current between anodic and cathodic compartments and the parameters obtained from polarization tests. A theoretical model based on adsorption coverage is used to characterize atomic hydrogen that forms and diffuses within the steel, as a competition of the hydrogen and bicarbonate ions for the available active sites at the interface.
Hydrogen-related attack is a specific mechanism that can contribute to SCC (Stress Corrosion Cracking), through its influence on internal stress and the microstructure due to atomic hydrogen concentration diffused and accumulated during operation conditions due to the formation of atomic hydrogen in presence and absence of polarization conditions (cathodic protection). In this work, an API X-65 grade steel pipeline is exposed to NS4 synthetic groundwater solution in hydrogen permeation cell type experiments in order to follow the hydrogen reaction in the cathodic compartment and to characterize the total current between anodic and cathodic compartments and the parameters obtained from polarization tests. A theoretical model based on adsorption coverage is used to characterize atomic hydrogen that forms and diffuses within the steel, as a competition of the hydrogen and bicarbonate ions for the available active sites at the interface.
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