An electrochemical study of phase-transitions in rust layers
An electrochemical study of phase-transitions in rust layers
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DOI：
10.1016/0010-938x(83)90024-0
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发表时间：
1983
影响因子：
8.3
通讯作者：
M. Stratmann;K. Bohnenkamp;H. Engell
中科院分区：
文献类型：
--
作者：
M. Stratmann;K. Bohnenkamp;H. Engell
用电化学方法研究了孤立的锈层，以确定它们的还原和再氧化是否会影响铁的大气腐蚀。当电位低于0 mV时，首先在γ-FeOOH表面形成一层含Fe~(2+)的薄层。这种还原的表面层可以在酸性pH下溶解到电池电解液中，或者在较低的电位下，Fe2+离子可以与γ-FeOOH反应生成Fe3O4。地磁测量可追踪磁铁矿的形成过程。还原的表面层很容易氧化回γ-FeOOH，磁铁矿可以部分氧化成γ-Fe2O。
Isolated rust layers have been investigated by electrochemical methods to find out whether their reduction and re-oxidation can affect the atmospheric corrosion of iron. At potentials below 0 mV, first a thin Fe2+-containing surface layer is formed on top of the γ-FeOOH. This reduced surface layer can dissolve into the cell electrolyte at acid pH, or at lower potentials the Fe2+-ions can react with γ-FeOOH to Fe3O4. The formation of magnetite could be followed byin-situmagnetic measurements. The reduced surface layer can easily be oxidized back to γ-FeOOH, magnetite can partly be oxidized to γ-Fe2O3.