Corrosion Behaviour of DH36 Steel Used for Oil Platform in Splash Zones
Corrosion Behaviour of DH36 Steel Used for Oil Platform in Splash Zones
复制标题
石油平台用DH36钢在飞溅区的腐蚀行为
DOI：
10.14773/cst.2015.14.4.190
复制
发表时间：
2015-08
期刊：
影响因子：
--
通讯作者：
B. R. Hou
中科院分区：
文献类型：
--
作者：
J. G. Liu;Y. T. Li;B. R. Hou
飞溅区是海洋环境中腐蚀性最强的区域，暴露在该区域的钢结构的腐蚀是一个严重的问题。DH36钢是我国海洋石油平台最常用的钢之一，本文研究了其在飞溅区的腐蚀行为。极化曲线从腐蚀钢暴露在这个区域，而锈钢的形貌和锈的特征在于使用扫描电子显微镜和X射线衍射。飞溅区形成双层锈层。内层为磁铁矿和微细粒针铁矿，外层为针铁矿和少量针铁矿的堆积。在湿润期，铁与纤铁矿发生溶解反应，生成磁铁矿，而在干燥期，磁铁矿又被氧化成纤铁矿。电化学还原和化学氧化在间歇的干湿交替过程中循环进行，磁铁矿和纤铁矿参与了还原反应，导致腐蚀严重。
The splash zone is the most corrosive area of the marine environment, and the corrosion of steel structures exposed in this area is a serious concern. DH36 steel is one of most commonly used steels for offshore oil platforms in China, and its corrosion behaviour in splash zones was studied in this paper. Polarization curves were obtained from the corroded steel exposed in this area while the morphologies and rusts of the rust steel were characterized using scanning electron microscopy and X-ray diffraction. Double rust layers were formed in the splash zone. The inner layer contained magnetite and fine flaky lepidocrocite, and the outer layer was composed of accumulated flaky lepidocrocite and a small amount of goethite. In the wet period, the iron dissolved and reacted with lepidocrocite, and magnetite appeared, while the magnetite was oxidized to lepidocrocite again during the dry period. Electrochemical reduction and chemical oxidization cycled in intermittent wetting and drying periods, and magnetite and lepidocrocite were involved in the reduction reaction, leading to serious corrosion.
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