轨道交通动态杂散电流对埋地管道的干扰腐蚀试验  

Disturbed Corrosion of Buried Gas Pipe-lines Induced by Rail Traffic Dynamic Stray Current

作　　者：王新华[1] 刘菊银[1] 何仁洋[2] 陈振华[1] 

机构地区：[1]北京工业大学机械工程与应用电子技术学院,北京100124 [2]中国特种设备检测研究中心压力管道部,北京100013

出　　处：《腐蚀与防护》2010年第3期193-197,共5页Corrosion & Protection

基　　金：国家质检总局质检公益性行业科研专项项目(07-10-50-01)

摘　　要：轨道交通动态杂散电流是造成城镇埋地燃气钢质管道腐蚀泄漏的主要原因。由于现场环境的复杂多变,目前对动态杂散电流干扰腐蚀的研究尚未深入,动态杂散电流危害评估主要建立在经验判断的基础上。本工作在实验室搭建动态杂散电流加速腐蚀试验平台,研究了杂散电流的时变规律以及管地电位变化特征,同时也研究了动态杂散电流干扰环境下土壤酸碱度、土壤电导率、杂散电流频率以及杂散电流密度对管道腐蚀速率的影响,利用回归分析方法建立了腐蚀速率计算的数学模型,确立各影响因素对腐蚀速率的贡献率,并验证了模型的可靠性,为现场埋地钢质管道腐蚀危害性评价提供了一定的依据。Most of the buried gas pipe-line corrosion is induced by the dynamic stray current leaking from the rail traffic. Due to the complexity and variability of the field environments, in-depth study on dynamic stray current disturbance and corrosion is scare, the hazard judgment of dynamic stray current is mainly set up on the basis of working experience. A stray-current accelerated corrosion test platform was set up to investigate the time-varying patterns of stray current and the changing characters of pipe-to-soil potential The effects of soil pH, soil conductivity, stray current frequency and density on corrosion rate were also investigated. A math model was built to establish the factorst contribution rate to pipeline corrosion and the reliability of the model was verified, which provides theoretical evidence for the judgment of buried gas pipelines＇ corrosion hazard.

关 键 词：动态杂散电流 腐蚀速率 回归分析 危害评估 

分 类 号：TG174.3[金属学及工艺—金属表面处理]