Raman Investigation of Anodic Undermining of Coated Steel During Environmental Exposure
Raman Investigation of Anodic Undermining of Coated Steel During Environmental Exposure
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DOI：
10.5006/1358
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发表时间：
2014-12-01
期刊：
影响因子：
1.6
通讯作者：
Frankel, G. S.
中科院分区：
文献类型：
--
作者：
Cambier, S. M.;Verreault, D.;Frankel, G. S.
为了确定腐蚀过程中重要的环境变量，对含有人工缺陷的涂层钢样的大气腐蚀进行了表征。涂层钢样暴露在夏威夷、佛罗里达和俄亥俄州的不同气候中。用拉曼光谱对涂层下生成的铁氧化物进行了鉴定，从而推测了腐蚀机理。这些机理受到湿润时间(TOW)以及在不同地点测得的氯和硫的沉积速率的影响。观察到两种腐蚀形态：在缺陷附近形成珠状腐蚀和由珠状腐蚀引发丝状腐蚀。珠状腐蚀受丝束和盐沉积的影响，而FFC生长在潮湿环境中，但其机理与盐沉积无关。在几乎所有接受测试的地点，氯化物是参与腐蚀过程的唯一盐。
The atmospheric corrosion of coated steel samples with artificial defects was characterized to determine the environmental variables that are important in the corrosion process. Coated steel samples were exposed to different climates in Hawaii, Florida, and Ohio. The iron oxides formed under the coating were identified with Raman spectroscopy, which allowed the corrosion mechanisms to be deduced. Those mechanisms were influenced by the time of wetness (TOW) and the deposition rate of chloride and sulfur that were measured at the different sites. Two corrosion morphologies were observed: bead-like corrosion was formed in the defect vicinity and filiform corrosion (FFC) was initiated from the bead-like corrosion. Bead-like corrosion was influenced by the TOW and the salt deposition, whereas FFC grew in the humid environment, but its mechanism was independent of the salt deposition. At almost all of the sites tested, chloride was the only salt that participated in the corrosion process.