The physical meaning of electrode potentials at metal surfaces and polymer/metal interfaces: Consequences for delamination
The physical meaning of electrode potentials at metal surfaces and polymer/metal interfaces: Consequences for delamination
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DOI：
10.1149/1.2926589
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发表时间：
2008-01-01
影响因子：
3.9
通讯作者：
Rohwerder, M.
中科院分区：
文献类型：
--
作者：
Hausbrand, R.;Stratmann, M.;Rohwerder, M.
在油漆与贱金属脱粘过程中控制局部原电池形成的一个关键参数是油漆缺陷与完整金属氧化物/聚合物界面之间的电位梯度。锌涂层的适当开发可以控制完整界面的电位，从而改善分层行为。然而，尽管在最近的许多出版物中，在合金表面测量的夹杂物和基体之间的伏特电势差通常被解释为提供有关腐蚀过程中电偶活动的信息，但尚未对聚合物/金属界面甚至裸金属表面的电极电势的起源和含义进行系统深入的研究。本文的重点是对不同材料上测量的电势的起源进行详细分析，并指出可以从它们的值中得出什么结论。特别关注技术上重要的锌-镁体系。 (c) 2008 年电化学协会。
A key parameter that controls the formation of a local galvanic element during the deadhesion of paint from base metals is the potential gradient between a defect in the paint and the intact metal oxide/polymer interface. The suitable development of zinc coatings allows for control of the potential at the intact interface and thus improvement of the delamination behavior. However, no systematic in-depth study on the origin and meaning of electrode potentials at polymer/metal interfaces or even bare metal surfaces has been presented yet, although in many recent publications Volta potential differences between inclusions and matrix measured on the surfaces of alloys are often interpreted as providing information on the galvanic activity during corrosion. It is the focus of this paper to present a detailed analysis of the origin of the potentials measured on the different materials and to point out what conclusion can be drawn from their values. Special focus is given to the technologically important system Zn-Mg. (c) 2008 The Electrochemical Society.