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首页> 外文期刊>RSC Advances >Understanding the low corrosion potential and high corrosion resistance of nano-zinc electrodeposit based on electron work function and interfacial potential difference
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Understanding the low corrosion potential and high corrosion resistance of nano-zinc electrodeposit based on electron work function and interfacial potential difference

机译：基于电子功函数和界面电势差了解纳米锌电沉积物的低腐蚀电位和高耐蚀性

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摘要

Nano-electrodeposition has been demonstrated to be more effective in protecting materials from corrosion, compared to conventional electrodeposition. However, debate still exists regarding why nanocrystalline electrodeposits show more negative corrosion potentials but lower corrosion rates than those of coarse-grained electrodeposits. In this work, we investigated corrosion behaviors of electrodeposited nanocrystalline and microcrystalline zinc coatings in a 3.5 wt% NaCl solution, and related them to the electron work functions of the coatings in order to understand the addressed issue based on the electron stability. It is demonstrated that the corrosion potential (phi(m)) of a deposit depends on its electron work function (phi(m)) and the contact potential difference at the electrodeposit/solution interface (Delta(m)(s)psi). phi(m) reflects the stability of electrons in the deposit, while Delta(m psi)(s) reflects the environmental influence on the chemical stability of the deposit, which affects the actual corrosion rate. The present study shows that electrons in the nanocrystalline zinc coating are less confined due to its high-density grain boundaries, corresponding to lowered phi(m). However, Delta(m)(s)psi of the nanocrystalline coating is more positive than that of coarse-grained one, leading to a lower corrosion rate. This study helps end the debate and provide relevant information for optimize nanocrystalline electrodeposits.
机译：与常规电沉积相比，已证明纳米电沉积在保护材料不受腐蚀方面更有效。但是，关于纳米晶电沉积物为何比粗晶粒电沉积物显示出更大的负腐蚀电位但腐蚀速率却仍存在争议。在这项工作中，我们研究了电沉积的纳米晶体和微晶锌涂层在3.5 wt％NaCl溶液中的腐蚀行为，并将它们与涂层的电子功函数相关联，以便基于电子稳定性来理解所解决的问题。结果表明，沉积物的腐蚀电势（phi（m））取决于其电子功函数（phi（m））和电沉积/溶液界面的接触电势差（Delta（m）（s）psi）。 phi（m）反映了沉积物中电子的稳定性，而Delta（m psi）（s）反映了环境对沉积物化学稳定性的影响，这会影响实际的腐蚀速率。本研究表明，由于其高密度晶界（对应于降低的phi（m）），纳米晶锌涂层中的电子受到的约束较少。但是，纳米晶涂层的Delta（m）（s）psi比粗晶粒涂层的Delta（m）（s）psi更正，从而导致较低的腐蚀速率。这项研究有助于结束辩​​论，并提供有关优化纳米晶体电沉积的相关信息。

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