目的 介绍基于直流电位梯度法的滩浅海海底管道外防腐层破损检测的研究思路及所开发的配套的检测设备。 方法 通过模拟检测实验，考察了直流电位梯度检测方法在海底管道外防腐层破损检测中的可行性、检测装置运行及测量功能的适用性。 结果 模拟检测实验实现了滩浅海海底管道外防腐层破损的有效检测，且不受海底管道正常填埋的影响，可实现管道外防腐层 8 mm×8 mm（8 mV/m）以上破损的非接触式检测。 结论 基于直流电位梯度法的滩浅海海底管道外防腐层破损检测技术可行。可以利用所研发的检测装置，通过海底管道沿线电位梯度的测量，判断管道外防腐层破损及牺牲阳极块位置，从而为管道的运行维护提供技术支持。

The work aims to introduce the research approach and developed supporting testing equipment of external coating damage inspection for submarine pipelines in paralic zone based on DC potential gradient method. Feasibility of DC potential gradient method in external coating damage inspection for submarine pipelines in addition to applicability of detector operating and measuring functions were investigated by virtue of a simulative test. This method was proved to be effective by the simulative test. Damage larger than 8 mm×8 mm (8 mV/m) on the external coating could be inspected contactlessly in regardless of the effects of normal filling of submarine pipelines. The external coating damage inspection technology for submarine pipelines in paralic zone based on DC potential gradient method turns out to be feasible. Position of external coating damage and sacrificial anode can be determined by utilizing the developed detector and measuring potential gradient along the submarine pipelines. This method can provide technical support for operation and maintenance of the submarine pipelines.