PROTECTION OF MOORING BUOYS. PART X. RESULTS OF NINTH RATING INSPECTION
NAVAL CIVIL ENGINEERING LAB PORT HUENEME CA
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Thirteen buoys were given their ninth rating after a maximum of 5 years exposure for extent of coating deterioration, corrosion of steel, and fouling. Two other buoys had previously been removed from the test program because of advanced deterioration. The coating systems on three of the buoys were in good condition, while those on nine others showed varying degrees of moderate deterioration, and one was in such poor condition that it was also removed from the test program. Two sets of steel panels coated with the different systems used on the buoys were given their eighth rating inspection after 4 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 coating, but there was a general correlation between the conditions of the two test groups. On buoys coated with antifouling paints, no detectable antifouling property remained after 20 months, but on both sets of test panels, two antifouling coatings containing copper oxide were still appreciably reducing fouling after 4 years. Patches of underwater-curing epoxy applied to buoys where localized damage to the coating had been caused by abrasion were in good condition. Some patches had been providing protection for 4 years. Three of the buoys were cathodically protected with zinc anodes. The underwater portions of these buoys were receiving protection from corrosion 33 months after anode installation.
- Coatings, Colorants and Finishes
- Fabrication Metallurgy
- Marine Engineering