土壤电阻率对埋地管道杂散电流腐蚀影响的研究进展

Research Progress on Soil Resistivity Affecting Stray Current Corrosion of Buried Pipeline

摘要: 用四电极法测量土壤电阻率能减小因土壤组成的不均匀性而产生的影响，一般认为土壤电阻率与杂散电流腐蚀成反比关系。土壤电阻率的影响因素如含水量、含盐量、孔隙率、温度、土壤PH值及盐分类型等会对杂散电流腐蚀程度产生一定的影响。在一定范围内，土壤电阻率随着含水量、饱和度、含盐量、温度、孔隙率的增大而减小，杂散电流腐蚀也会随之加剧。而不同盐分类型对杂散电流腐蚀程度产生的影响将会不尽相同，本文分析了酸性盐、碱性盐以及含Cl−的盐等对杂散电流腐蚀的影响，并对复杂盐分类型的研究提出了展望。

Abstract: Using four-electrode method to measure soil resistivity can decrease the influence caused by nonuniformity of soil compositions. Generally, soil resistivity is inversely proportional to the stray current corrosion. Factors which can affect soil resistivity may make differences to stray current corrosion, such as water content, salt content, porosity, temperature, PH value of soil and the types of salt. Within a certain range, as the water content, water saturation, salinity, temperature and porosity increase, soil resistivity decreases and then stray current corrosion aggravates. However, different types of salt have different influences on stray current corrosion. This paper analyzes how the acidic salt, alkaline salt and the salt containing Cl− affect stray current corrosion, and puts forward the outlook for the research of complex salt types.