对于埋地带保温层天然气管道, 由于防腐保温结构绝缘电阻率极高, 对阴极保护电流具有屏蔽性, 导致传统的阴极保护技术实施方式起不到完全的保护作用。为此, 提出并设计了一种新型阴极保护技术实施方式——保温层内置牺牲阳极技术来解决“阴极保护电流屏蔽”问题, 采用模拟试验方法对该方式的可行性及保护效果进行了研究。结果表明, 保温层内置牺牲阳极技术可有效解决防腐蚀保温层对阴极保护电流的屏蔽问题, 为埋地带保温层管线补口处提供有效的阴极保护, 并为此类问题的解决开拓了一种新的思路和方法。

For the buried pipeline with thermal insulation which has the current shielding characteristic, impressed current cathodic protection can′t play the full protection. To this end, we propose and design a new embodiment of cathode protection——A built-in sacrificial anode under thermal insulation, and with simulation experiments, the feasibility and protective effect were studied. The test results show that, the built-in sacrificial anode under thermal Insulation can effectively solve the problem of the current shielding of the anticorrosion insulation layer, provide effective protection for the buried pipeline with thermal insulation, and open up a new thought and method for solving this kind of problem.