研究一种确定旧管道阴极保护电流密度的新方法。现场试验结果表明，运用该方法确定旧管道阴极保护电流密度是准确实用的。
A new method is introduced to determine the current density required for protecting an aged underground pipeline. The field test results show that this method is exact and practical.
有限元法已被证明是计算阴极保护场中电位、电流密度分布的有效方法。
The 2-d finite element method was an effective method to calculate the potential and current density distribution of cathodic protection fields.
试验结果表明，对裸钢采用阴极保护时，所需电流密度较大，实施难度较大；而对有涂层的钢则更宜采用阴极保护措施。
Results show that it is difficult to make cathodic protection on bare steel because of large current density, and that cathodic protection is suitable for coated steel.
试验结果表明，对裸钢采用阴极保护时，所需电流密度较大，实施难度较大；而对有涂层的钢则更宜采用阴极保护措施。
Results show that it is difficult to make cathodic protection on bare steel because of large current density, and that cathodic protection is suitable for coated steel.
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