海底管道CO_(2)腐蚀特性及预测模型研究进展

Research Progress on Characteristics and Prediction Models of Carbon Dioxide Induced Corrosion for Submarine Pipelines

介绍了海底管道的CO_(2)腐蚀机理,具体涉及化学反应过程、电化学反应过程、传质过程和成膜过程。其次,总结了海底管道CO_(2)腐蚀影响因素,主要包括元素成分、显微组织决定的材料自身因素,以及介质成分、温度、pH等决定的外部环境因素。汇总了各影响因素对腐蚀速率的经验/半经验规律。重点归纳了海底管道CO_(2)腐蚀模型,详细介绍了原理模型法和经验模型法在腐蚀评估和预测中的控制步骤和边界条件。

Firstly,the mechanism of CO_(2) induced corrosion of submarine pipeline is introduced,in-cluding chemical reaction process,electrochemical reaction process,mass transfer process and film for-mation process.Secondly,the influencing factors of CO_(2) induced corrosion of submarine pipelines are summarized,which mainly include material factors determined by chemical composition and microstruc-ture,and external environmental factors determined by medium composition,temperature and pH,etc.At the same time,the empirical/semi-empirical regulations of the corrosion rate versus influencing factors are summarized.Finally,the models of CO_(2) induced corrosion of submarine pipeline is summarized,and the control steps and boundary conditions of the principle model and empirical model for corrosion-as-sessment and-prediction are introduced in detail.