海洋油气装备阴极保护电化学腐蚀研究

Research on electrochemical corrosion of cathodic protection for offshore oil and gas equipment

在深水海洋环境下的油气装备对其使用寿命和生命周期内的可靠性要求极高,故采取阴极保护的方法来减缓电化学腐蚀。以承担海洋油气装备研制任务的4130合金结构钢为阴极材料,通过模拟真实海水腐蚀环境,建立阴极保护系统模型,采用恒电流加速腐蚀试验的方法对Al-Zn-In-Cd,Al-Zn-In-Sn和Al-Zn-In-Si三种牺牲阳极材料进行电化学性能测试,通过对试验结果进行分析和计算,得出三种材料的电流效率和阳极溶解情况,为海洋油气装备牺牲阳极材料的选择提供了试验依据,也为阴极保护方案设计奠定了基础。

Oil and gas equipment in deep water marine environments required extremely high reliability over their service life and lifecycle,so cathodic protection methods were adopted to mitigate electrochemical corrosion.Taking 4130 alloy structural steel as cathode material,a cathodic protection system model was established by simulating real seawater corrosion environment.The method of constant current accelerated corrosion test was used to conduct electrochemical performance tests on three sacrificial an⁃ode materials,Al⁃Zn⁃In⁃Cd,Al⁃Zn⁃In⁃Sn,and Al⁃Zn⁃In⁃Si.By analyzing and calculating the test results,current efficiency and anodic dissolution of the three materials were obtained,providing experimental basis for the selection of sacrificial anode materials for offshore oil and gas equipment,and laying a foundation for the design of cathodic protection schemes.