埋地管道交流腐蚀的实验室评价方法

Laboratory evaluation method of buried pipeline AC corrosion

针对长期以来埋地管道交流腐蚀评价只能依赖现场测取的交直流参数且准确性欠佳的问题,提出了一种埋地管道交流干扰腐蚀的实验室评价方法。通过现场测取实际管道的交流干扰信号,在实验室使用取自管道沿线的土样进行大范围交流腐蚀模拟实验,评价埋地管道在现场交流干扰条件下的真实腐蚀风险。研究结果表明:采用对称电路和数字信号处理技术,可以实现在实验室内精确模拟实际管道在交流腐蚀和阴极保护条件下的腐蚀速率;通过覆盖现场测量数据的交流干扰腐蚀失重实验,可以最大程度地在实验室内实现埋地管道交流干扰的腐蚀风险评价与表征。

In light of the problem that AC corrosion evaluation of buried pipeline could only rely on AC and DC parameters measured in the field without sound accuracy for a long term, an experimental evaluation method is proposed for AC interference corrosion of buried pipeline. AC interference signals of actual pipeline measured in the field and soil samples taken around the pipeline are used to carry out a wide-range AC corrosion simulated experiment to evaluate real corrosion risks for the buried pipeline under the field AC interference conditions. Research results show that symmetric circuit and digital signal processing technique can be used to accurately simulate the corrosion rate of actual pipeline under the conditions of AC corrosion and cathodic protection in the laboratory. AC interference corrosion weightlessness experiment covering the field measurement data can achieve corrosion risk evaluation and representation of buried pipeline AC interference in the laboratory to the maximum extent. （4 Tables, 6 Figures, 5 References）