The effect of β-FeOOH on the corrosion behavior of low carbon steel exposed in tropic marine environment
The effect of β-FeOOH on the corrosion behavior of low carbon steel exposed in tropic marine environment
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DOI：
10.1016/j.matchemphys.2008.06.066
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发表时间：
2008-12-20
影响因子：
4.6
通讯作者：
Wang, Fuhui
中科院分区：
文献类型：
--
作者：
Ma, Yuantai;Li, Ying;Wang, Fuhui
研究了中国南部热带海洋环境气候变暖区碳钢在不同暴露时间(长达2年)下的大气腐蚀性能。为了研究β-FeOOH对碳钢在高氯离子环境中腐蚀行为的影响，用红外光谱、扫描电子显微镜、X射线衍射仪对锈层进行了分析，并用电化学阻抗谱方法对锈层进行了测量。失重试验表明，碳钢的腐蚀速率在暴露6个月内急剧增加，随着暴露时间的延长，腐蚀速率逐渐减小。锈层分析结果表明，碳钢的潜在腐蚀性能取决于在不同条件下形成的锈层的固有性质，如成分和结构。在所有氧化铁中，β-FeOOH的影响最大。在最初的暴露阶段，锈层和β-FeOOH的存在加速了腐蚀过程。交流阻抗数据表明，在湿-干循环过程中，内层中的β-FeOOH逐渐被消耗并转化为γ-Fe2O，这有利于保护衬底，降低腐蚀速度。(C)2008爱思唯尔B.V.保留所有权利。
The atmospheric corrosion performance of carbon steel exposed in Warming area, which located in the south part of China with tropic marine environment characters, was studied at different exposure periods (up to 2 years). To investigate the effect of beta-FeOOH on the corrosion behavior of carbon steel in high chloride ion environment, rust layer was analyzed by using infrared spectroscopy, scanning electron microscope, X-ray diffraction, and the rusted steel was measured by electrochemical impedance spectroscopy method. The weight loss test indicated that the corrosion rate of carbon steel sharply increased during 6 months' exposure and gradually reduced after longer exposure. The results of rust analysis revealed that the underlying corrosion performance of the carbon steel was dependent on the inherent properties of the rust layers formed under different conditions such as composition and structure. Among all the iron oxide, beta-FeOOH exerted significant influence. The presence of a monolayer of the rust as well as beta-FeOOH accelerated the corrosion process during the initial exposure stage. EIS data implied that beta-FeOOH in the inner layer was gradually consumed and transformed to gamma-Fe2O3 in the wet-dry cycle, which was beneficial to protect the substrate and reduced the corrosion rate. (C) 2008 Elsevier B.V. All rights reserved.