PROTECTION OF MOORING BUOYS. PART 4. RESULTS OF FIFTH RATING INSPECTION
2006
Drisko, R. W.
Fourteen test buoys were given their fifth rating for extent of coating deterioration, corrosion of steel, and fouling. A fifteenth buoy had been removed from testing at the time of the fourth inspection because of advanced deterioration. The coating systems on four of the buoys were in good condition, and those on the ten others showed varying degrees of moderate deterioration. Two sets of thirteen test panels each, coated with the different coating systems used on the buoys, were given their fourth rating inspection after 2 years of service. One set was exposed in San Diego Bay and the other in Port Hueneme Harbor. The condition of the coating systems on the Port Hueneme panels showed a general correlation with the test panels and buoys in San Diego. On those buoys with antifouling paints, no detectable antifouling protection remained after 25 months, but on the test panels at both locations two antifouling paints were still retarding fouling after 2 years. Three of the test buoys were cathodically protected with zinc anodes. The level of protection was great enough to mitigate rusting on the underwater portions of these buoys.
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