高雄港#101碼頭水下結構腐蝕檢測與評估

Corrosion Inspection and Assessment on Submerged Steel Piles of #101 Wharf in Kaohsiung Harbor

碼頭結構處於海洋環境中，除了遭受波浪及船舶靠岸之撞擊作用外，容易有腐蝕問題產生，尤其以潮間帶與水下部位之鋼樁結構為甚。一旦腐蝕問題持續惡化，不僅會折損鋼樁使用壽命，也會對碼頭使用安全性構成極大威脅。因此，必須透過腐蝕檢測與評估，才能達成有效之碼頭維護管理，降低碼頭鋼樁腐蝕風險。碼頭水下結構物之腐蝕檢測對象，係指水下鋼樁及陰極防蝕系統，一般檢測項目包括目視檢查鋼樁與陽極塊表面腐蝕情況、鋼樁厚度與腐蝕速率量測、鋼樁保護電位量測、陽極塊重量檢查與壽命評估、海水水質分析等。本文採用上述檢測技術，並以高雄港#101碼頭為例，探討鋼樁腐蝕檢測與陰極防蝕系統有效性評估技術，並提出維修改善建議。

The steel piles of wharf immersed in seawater have suffered great impact of waves and serious corrosion problems, particularly the steel piles within the splash zone, tidal zone and continuously immersed zone. Once corrosion gets progressively worse without notice, eventually will lead to structural failure and decrease the service life of the steel piles and form a serious threat to the security of wharf. Therefore, by means of carrying out corrosion inspection and assessment programs, the effective maintenance of wharf structures can be achieved to decrease the corrosion risk. The corrosion inspection objects of underwater structure of wharf involve the submerged steel piles and the existing galvanic cathodic protection system on the steel piles. The general inspection items include visual inspection, material thickness and corrosion rate measurements, cathodic protection potential measurement, anode weight and service-life assessment, seawater analysis etc. #101 wharf in Kaohsiung harbor has been examined to discuss the corrosion inspection technique on the steel piles and the assessment of cathodic protection system's effectiveness. Recommendations for maintenance are also suggested.