The mechanism of the oxygen reduction on rust-covered metal substrates
The mechanism of the oxygen reduction on rust-covered metal substrates
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DOI：
10.1016/0010-938x(94)90161-9
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发表时间：
1994-02
影响因子：
8.3
通讯作者：
M. Stratmann;J. Müller
中科院分区：
文献类型：
--
作者：
M. Stratmann;J. Müller
氧还原是铁腐蚀过程中主要的阴极部分反应。当pH值>4时，反应大于H+还原反应。在相同的pH值范围内，铁表面被不溶性氧化物层覆盖，如锈皮。由于锈层在氧还原的电位范围内减少，本研究的目的是分析氧还原动力学与锈层还原之间的关系。本文提出的结果表明，氧主要是减少锈层内，而不是在金属/电解质相界。为了允许任何氧还原，必须减少锈层。氧化的锈皮几乎不含Fe 2+态，完全抑制氧的还原。
Oxygen reduction is a major cathodic partial reaction during the corrosion of iron. The reaction is greater than the H+reduction reaction for pH values >4. In the same pH range the iron surface is covered by insoluble oxide layers like rust scales. As rust scales are reduced in the potential range of the oxygen reduction, it was the aim of this study to analyse the relation between the kinetics of the oxygen reduction and the reduction of the rust layer. The results presented in this paper show that oxygen is predominantly reduced within the rust scale and not at the metal/electrolyte phase boundary. In order to allow any oxygen reduction, the rust layers have to be reduced. Oxidized rust scales, which are nearly free of Fe2+states, inhibit the reduction of oxygen completely.