随着国家能源工业、铁路工业的快速发展, 埋地钢质管道与高压线、交流电气化铁路共用走廊的情况越来越多, 埋地钢质管道上容易产生交流杂散电流。交流杂散电流从防腐蚀层破损处流出会产生交流腐蚀, 并对阴极保护系统的安全运行造成不利影响, 如果埋地钢质管道上交流电压达到一定限值, 会威胁管道维护人员的安全。本文对交流杂散电流的腐蚀机理、检测方法、信号处理方法及评价准则进行了介绍。以期管道建设人员、检测人员、维护人员对此引起足够的重视。

With the rapid development of the national energy industry and railway industry, it is becoming more and more common that buried steel pipelines share the same corridor with high-voltage wire or AC electrified railway, which may easily lead to AC stray current on buried steel pipelines. If the coatings on buried steel pipelines are damaged, AC stray current on buried steel pipelines can cause AC corrosion and destroy the cathodic protection(CP) system. When AC voltage on the buried steel pipeline reaches a certain value, it would be a great threatening to pipeline maintenance personnel. This paper presents the corrosion mechanism of AC stray current, detection methods, signal processing methods and evaluation criteria, in order to attract the attention from pipeline laying personnel, inspectors and maintenance personnel.