陕京管线典型土壤环境的腐蚀性研究

INVESTIGATIONS OF CORROSION SENSITIVITY IN TYPICAL SOIL ENVIRONMENTS OF SHAN-JING GAS PIPELINE

采用埋片试验和电化学试验研究了X60管线钢在陕京管线典型土壤环境中的腐蚀性.由于土壤环境的差别,陕京管线沿线土壤腐蚀性存在很大的差异,3个测试点之一具有高的腐蚀性,腐蚀特征以点腐蚀和溃疡型腐蚀为主.统计分析表明,最大腐蚀坑深度的对数服从正态概率分布.土壤的自腐蚀电位和极化曲线对土壤的含水率具有明显的依赖关系,其电化学腐蚀过程主要受电化学极化的控制.

The buried tests and the electrochemical experiments were applied to investigate the corrosion sensitivity of X60 steel in typical soil environments of Shan- Jing gas pipeline. There is quite different on the soil corrosion sensitivity along the gas pipeline due to the difference of the soils. The one of three typical test soils has higher corrosion sensitivity. The morphology of the soil corrosion is characteristic of pitting and ulcer corrosion. The results of statistical analysis show that the logarithm of the maximum depth of the pitting is submitted to the normal distribution. The self corrosion potentials and the polarization curves depend on the content of water in the soil intensively. The process of the electro - chemical corrosion is mainly controlled by the electro - chemi- cal polarization.