PROTECTION OF MOORING BUOYS. PART 8. RESULTS OF SEVENTH RATING INSPECTION
2006
Drisko, R. W.
This is the eighth of a series of reports on the protection of mooring buoys. Thirteen test buoys were given their seventh rating for extent of coating deterioration, corrosion of steel, and fouling. Two other buoys had previously been removed from testing because of advanced deterioration. The coating systems on three of the buoys were in good condition while those on 10 others shoed varying degrees of moderate deterioration. Two sets of 13 panels each, coated with the different systems used on the buoys, were given their sixth rating inspection after 3 years of exposure. One set was exposed in San Diego Bay and the other in Port Hueneme Harbor. The condition of the coatings on both sets of panels was generally better than that of the buoy coatings, but there was a general correlation between the conditions of the two test groups. On buoys coated with antifouling paints, no detectable antifouling protection remained after 25 months, but on both sets of test panels, two antifouling paints were still appreciably reducing fouling after 3 years. Three of the buoys were cathodically protected with zinc anodes. The level of protection was high enough to mitigate rusting in the underwater portions of these buoys.
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