On the corrosion behaviour of novel high carbon rail steels in simulated cyclic wet–dry salt fog conditions
On the corrosion behaviour of novel high carbon rail steels in simulated cyclic wet–dry salt fog conditions
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DOI：
10.1016/j.corsci.2008.02.021
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发表时间：
2008-06
影响因子：
8.3
通讯作者：
B. Panda;R. Balasubramaniam;G. Dwivedi
中科院分区：
文献类型：
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作者：
B. Panda;R. Balasubramaniam;G. Dwivedi
在印度沿海地区，共析钢轨钢容易受到过度腐蚀。为了最大限度地减少这个问题，设计了四种含有微合金元素的新型钢轨钢，分别是Cu、Cr、Ni和Si。将这四种钢轨的腐蚀性能与三种已投入商业应用的钢轨的腐蚀性能进行了比较。通过模拟干湿盐雾暴露试验后的失重测量进行的定量评价表明，所有钢轨钢的失重值相似。铁锈样品的FTIR光谱显示，铁锈的内层和外层均以Fe3−xo4为主要相。对不同锈相的相对含量进行了比较。扫描电镜显示，Cr-Cu-Ni和Cr-Cu-Ni - si钢轨钢的锈蚀比其他钢轨钢更致密。阻抗谱分析表明，与其他钢轨相比，Cr-Cu-Ni和Cr-Cu-Ni - si钢轨钢在高频区形成了更高的阻抗。
Eutectoid rail steels are prone to excessive corrosion in the coastal locations in India. In order to minimise this problem, four new rail steels with microalloying elements, Cu, Cr, Ni and Si were designed. The corrosion behaviour of these four rail steels were compared with the behaviour of three rail steels already in commercial application. Quantitative evaluation done by weight loss measurements after simulated wet–dry salt fog exposure test showed similar weight loss values for all rail steels. The FTIR spectra of rust samples revealed the presence of Fe3−xO4as the major phase in both inner and outer layers of rusts on all the rail steels. Relative amounts of the different rust phases have been compared. SEM micrographs of the rusted samples revealed that the rust on Cr–Cu–Ni and Cr–Cu–Ni–Si rail steel was more compact than other rail steels. Impedance spectroscopy showed that the rust formed on Cr–Cu–Ni and Cr–Cu–Ni–Si rail steels resulted in the higher impedance in the high frequency region, compared to other rail steels.