バラストタンクにおける保護塗装及び塗膜劣化に関する研究

概要

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A seawater ballast tank of a ship is exposed to severe corrosive environment, and mainly protected by any coatings. Coating degradation is one of the main factors to cause the localized corrosion wastage of hull structure. It is important for soundness of hull structure to investigate coating degradation mechanism. The environment at back side of upper deck is most corrosive because of high temperature and high humidity. Sunshine causes high temperature, and residual ballast water causes high humidity. The coating test condition is proposed to simulate the seawater ballast tank environment at the back side of upper deck as the accelerating test of protective coating degradation. Coating degradation of actual ballast tank was also researched. Corrosion of hull structure increased at the specific part in ballast tank where the film thickness of protective coating was thin and no constant.
2010-12-28