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首页> 外文期刊>Corrosion >2009 W.R. Whitney Award Lecture: Local Hydrogen Generation and Its Impact on Environment-Assisted Cracking and Crevice Corrosion
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2009 W.R. Whitney Award Lecture: Local Hydrogen Generation and Its Impact on Environment-Assisted Cracking and Crevice Corrosion

机译:2009年W.R.惠特尼奖演讲:局部氢气的产生及其对环境辅助裂纹和缝隙腐蚀的影响

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摘要

An overview is given of the key role for reduction of hydrogen ions and water in determining the local chemistry and electrochemistry in crevices and cracks. Thus, the ability to cathodically protect long, tight crevices and cracks is explained on the basis of depletion of oxygen but also on the slower kinetics for hydrogen generation consequent upon the locally elevated pH. The conditions for developing locally acidic conditions in cracks are described and used to rationalize the "chemical short crack effect" in corrosion fatigue. It is then shown how the relative magnitude of the kinetics of hydrogen generation at the crack tip and on the surface external to the crack need to be considered in testing for resistance to hydrogen-assisted cracking. The importance of internal reactions in the context of boiling water reactor crack chemistry is highlighted, and finally, ideas about constraining crevice attack by increasing the local hydrogen evolution kinetics are explored. [PUBLICATION ABSTRACT]
机译:概述了还原氢离子和水在确定缝隙和裂缝中的局部化学和电化学作用中的关键作用。因此,基于氧气的消耗以及由于pH值局部升高而导致的较慢的氢生成动力学,说明了阴极保护长而紧的缝隙和裂纹的能力。描述了在裂纹中产生局部酸性条件的条件,并将其用于合理化腐蚀疲劳中的“化学短裂纹效应”。然后显示了在测试氢辅助开裂的抵抗力时,在裂纹尖端和裂纹外部表面上氢生成动力学的相对大小是如何需要考虑的。强调了在沸水反应堆裂化化学过程中内部反应的重要性,最后,探索了通过增加局部氢释放动力学来限制缝隙侵蚀的思想。 [出版物摘要]

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  • 来源
    《Corrosion》 |2010年第5期|p.1-11|共11页
  • 作者

    A Turnbull;

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    A. Turnbull*Presented as the W.R. Whitney Award Lecture at CORROSION/ 2009, March 2009. Atlanta, GA.* National Physical Laboratory, Teddington, Middlesex, TWl 1 OLW, United Kingdom.;

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