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首页> 外文期刊>Journal of Materials Science >Thermodynamically modeling the interactions of hydrogen, stress and anodic dissolution at crack-tip during near-neutral pH SCC in pipelines
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Thermodynamically modeling the interactions of hydrogen, stress and anodic dissolution at crack-tip during near-neutral pH SCC in pipelines

机译：在接近中性的pH SCC管道中，热力学模拟裂纹尖端处氢，应力和阳极溶解的相互作用

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摘要

A thermodynamic model was developed to clarify the interactions of hydrogen, stress and anodic dissolution at crack-tip during near-neutral pH stress corrosion cracking in pipelines by comprehensively considering the electrochemical reactions occurring in the pipeline steel in deoxygenated, near-neutral pH solution. By analyzing the change of the free-energy of steel due to the presence of hydrogen and stress, it is demonstrated that a synergism of hydrogen and stress promotes the cracking of steel. The enhanced hydrogen concentration in the stressed steel significantly accelerates the crack growth. An exact expression of the hydrogen concentration factor, i.e., the dependence of anodic dissolution rate of steel at crack-tip on the hydrogen concentration, is essential at the quantitative prediction of the crack growth rate.
机译：建立了一个热力学模型，通过综合考虑在脱氧的，接近中性的pH溶液中发生在管线钢中的电化学反应，阐明了管道中接近中性的pH应力腐蚀开裂过程中氢，应力和裂纹尖端的阳极溶解的相互作用。通过分析氢和应力的存在引起的钢自由能的变化，表明氢和应力的协同作用促进了钢的开裂。应力钢中氢浓度的增加大大加速了裂纹的发展。氢浓度因子的精确表达，即钢在裂纹尖端的阳极溶解速率对氢浓度的依赖性，在定量预测裂纹扩展速率时至关重要。

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