抄録
Four kinds of tar-epoxy paints and two kinds of zinc rich paints were applied to the I-shaped steel piles of 12m in length, and these six painted steel-piles were driven into the sea along with an I-shaped bare steel-pile. After about six years, the seven test steel-piles were pulled out and the performance of the paints in marine environments was examined. The obtained results are summerized as follows: (1) It has been observed that the performance of the paints at harbours depends on the kind of paint and marine environments. Especially, since the performance of tar-epoxy paints largely depends on the kind of paint, the paint for given conditions should be properly selected in applying to steel structures. On the other hand, the damages of zinc rich paint films were found just below the high water level in case of paint No. 6 and near the low water level in case of paint No. 5. (2) Corrosion is likely to localize at projecting portions directly under the mean low water level, but in the cases of paint No. 1 and 6 the localized corrosion was rarely found. (3) The damage of paints and the subsequent rust initiation due to the friction in driving piles were observed for all of the tested piles in the range of 2 to 3m from the bottom end.
