恒流脉冲技术检测管线钢土壤腐蚀

Galvanostatic Pulse Technique for Detecting Soil Corrosion of Pipeline Steel

采用恒流脉冲技术测量X80高强管线钢在酸性红壤中的腐蚀速率,并与极化曲线结果对照。结果表明,两种方法所得腐蚀速率有较好的相关性;恒流脉冲法可快速获取金属材料土壤腐蚀界面的腐蚀动力学参数,且对体系扰动小,不受材料真实暴露面积的影响,适合于管线钢土壤腐蚀现场监测。

Galvanostatic pulse measurement （GPM） was introduced as a new non-destructive technique to monitor corrosion of X80 pipeline steel in a red soil environment. Corrosion rate and double layer capacitance of the metal/soil interface for X80 pipeline steel in red soil were measured by GPM, and then the acquired data were compared with those measured by polarization method. Resuits show that the galvanostatic pulse method is applicable for monitoring soil corrosion of the steel and it can provide a nondestructive analytical probe into double layer characteristics at soil/ steel interface. The polarization resistance measurement indicated that corrosion rate of the steel decreased with time in the water saturated red soil.