地下管線AC腐蝕發展回顧

A Review of AC Corrosion of Underground Pipeline

Kubn在1928年第一次使用陰極防蝕保護地下管線，至今對於地下管線DC腐蝕的防治技術發展得相當完備。但是地下管線的AC腐蝕作用，直到1986年德國一條PE包覆管線發生兩處腐蝕孔，最後被正式確認為一條交流運輸系統所造成的AC腐蝕；因此AC腐蝕的問題才逐漸被重視，國外已有新的理論與防治方法被提出。AC腐蝕損害對國內管線業者相當陌生，因此這篇文章提醒管線業者，當管線遭受到AC干擾時，傳統的陰極防蝕系統可能會受到影響，因此必須同時解決AC干擾問題才能有效地保障管線的安全。

In 1928, Kubn started using cathodic protection to prevent underground pipelines from corrosion. To date, corrosion control for underground pipelines induced by DC current has been well developed. However, AC corrosion had not been taken into account until two pitting corrosion of a PE coated pipeline were found in Germany 1986. It was proven that an AC transportation system created AC corrosion in forms of pitting on the underground pipeline. Consequently, intensive studies on the corrosivity of AC current on buried structures grew up in the recent years. Even though theories and corrosion control methods for AC corrosion have been proposed in the several researches, lack of knowledge in this field is still present in Taiwan industries. This paper is an attempt to inform the Taiwan pipeline community that AC corrosion on underground pipelines is quite universal also serious. The traditional cathodic protection technology will not control AC corrosion to acceptable levels so that it must simultaneously solve AC corrosion problems to maintain the pipeline integrity.