Proceedings - Fifth International Conference & Exhibition on Piling and Deep Foundations, 1994, Bruges, Belgium, (DFI)
Exposure tests of mild steels and organic coatings in tropical marine environments
T. Kurisu, C. Shiotani, Y. Ito, T. Nakamura, M. Otuki & T. Asama
In order to secure long-term durability of offshore steel structures in tropical marine environments. Japanese Association for Steel Pipe Piles (JASPP) conducted 10-years marine exposure tests using various shaped mild steels and organic coatings at the seasides in Singapore and the Philippines. Average penetration of mild steels were in Singapore 0.5-0.7 mm/y at the splash zone and 0.2 mm/y at the tidal and submerged zones, while those in the Philippines were 0.5 mm/y and 0.2 mm/y at respective zones. The corrosiveness of tropical marine environments in Singapore or the Philippines are more severe than that of temperate Japanese marine. Cathodic protection system using aluminum - alloy anode is effective for corrosion protection of steel piles below the middle of tidal zone and in the submerged zone. Corrosion damages such as film exfoliation, blister, underfilm corrosion did not occur in "polyethylene," "glass flake-filled epoxy", "petrolatum +FRP" coatings with thick films, Organic coatings are especially effective for corrosion protection of steel piles in the splash and tidal zones.
|article #788; publication #36 (IC-1994)|