采用实验室模拟的方法研究来自直流运输系统产生的杂散电流对埋地金属管道腐蚀的影响,并通过强绝缘性能的涂层保护、杂散电流收集网、牺牲阳极保护、排流跨接保护等措施来有效减轻或消除杂散电流对埋地金属管道的腐蚀.结果表明:采取这几种防护措施在一定程度上均可以缓解杂散电流带来的腐蚀问题,其中排流跨接的保护效果最佳.然而在实际施工过程中,单一的防护措施均存在一定的局限性,需要综合考虑杂散电流的大小以及其他管道的情况,采用灵活有效的防护措施.
Simulation test in laboratory was carried out to study the impact of stray current produced by DC transportation system on buried metal pipelines.The measures such as coating protection,stray current collection network,sacrificial anode protection,current drainage and bridging protection were taken to mitigate or eliminate stray current corrosion of buried metal pipelines effectively.The results show that using these protective measures can bring certain remission to corrosion problems caused by stray current,among which drainage and bridging protection had the best effect.However,in practical construction process,single measure has certain limitation,so it is necessary to comprehensively consider the intensity of stray current and the situations of other pipelines,and take protective measures flexibly and effectively.
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