埋地钢质管道强制电流阴极联合保护研究

目的验证阴极保护系统在保护目标管道的同时对临近管道造成的杂散电流腐蚀,对比柔性阳极与阳极地床在保护管道的过程中产生的杂散电流污染情况,确定同沟铺设的不同管道联合保护方案。方法通过同一排流设备对相同区域的不同管线进行统一保护,阴极保护系统中的接地装置作为唯一的阳极,多条埋地管线作为电化学电池的阴极实现保护。结果阳极地床产生的杂散电流干扰明显强于柔性阳极材料;排流保护中,两条20 m埋地金属管道达到排流保护的范围时,柔性阳极的排流电压为1.2~1.52 V,远小于碳钢阳极地床的3.5~15 V,能够有效减少防护过程中电能的使用。结论同一阴极系统同时对多条金属管道或金属构筑物进行排流保护的措施可行。

Experimental Studies on the Impressed Current Cathodic Joint Protection of Buried Metallic Pipelines

Objective To verify the stray current corrosion caused to the adjacent pipelines by the cathodic protection system when protecting the target pipeline, compare the stray current pollution generated by flexible anode and anode ground bed during pipeline protection process, and propose joint protection of different pipelines buried in the same ditch. Methods The different pipelines in same region were jointly protected through the same drainage device, using the grounding device of the cathodic protection system as the only anode, and the multiple buried pipelines as the cathode of the electrochemical cell. Results The stray current interference caused by the anode ground bed was obviously stronger than that of the flexible anode material. In drainage protection, when the two 20 m buried metallic pipelines reached the range of drainage protection, the drainage voltage of the flexible anode was 1. 2 V to 1. 52 V, which was far smaller than that of the carbon steel anode ground bed (3. 5 ~ 15 V), effectively reducing the power consumption during the protection process. Conclusion The drainage protection of multiple metallic pipelines or metallic structures using the same cathodic system was feasible.