腐蚀
工作职能
离子键合
溶解
阴极保护
工作(物理)
阳极
金属
化学
解吸
材料科学
化学物理
热力学
冶金
物理化学
离子
电极
吸附
物理
有机化学
作者
Sirui Li,G. S. Frankel,Christopher D. Taylor
出处
期刊:Journal of The Electrochemical Society
[The Electrochemical Society]
日期:2022-08-01
卷期号:169 (8): 081506-081506
被引量:3
标识
DOI:10.1149/1945-7111/ac86f8
摘要
Corrosion resistance has become an important factor to consider in integrated computational materials engineering, yet generating science-based indicators of corrosion resistance for hypothetical materials remains challenging. We explore the quantitative relations between work function and corrosion potential, taking a theoretical approach that considers the relation between these thermodynamic and kinetically-determined variables. The work function is a fundamental thermodynamic property of a metallic surface in isolation, whereas the corrosion potential is kinetically determined as the potential at which the rates of anodic and cathodic processes active on the metal surface are equal. The latter quantity is therefore time dependent, as well as dependent on the material, surface preparation, ageing/history and the environment. Reasoning from Mixed Potential Theory, we develop a rationale for the correlation between the corrosion potential and the electronic work function. Two distinct Born-Haber cycles for the anodic dissolution reaction are analyzed to allow calculation of a related quantity, the ionic work function, which embodies the energy of desorption for metal cations from an electrode. The ionic work function is not only highly correlated with, but of similar magnitude to the cation hydration energy. The theoretical analysis provided herein establishes the significance of not only the electronic work function, but also the ionic work function, cation hydration energy, cohesive energy and the ionization potential as co-descriptors for the corrosion resistance of candidate corrosion resistant metal alloys, with the role of the environment to be considered in future work.
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