PROTECTION OF MOORING BUOYS. PART 5. FOURTH RATING INSPECTION
2006
Drisko, R. W.
This is the fifth of a series of reports on the protection of mooring buoys. Fourteen test buoys were given their fourth rating for extent of coating deterioration, corrosion of steel, and fouling. Another buoy was so deteriorated it was removed from test. Exposure periods vary for the buoys. The coating systems on eight of the buoys were in good condition and six showed varying degrees of moderate deterioration. Two sets of thirteen test panels coated with the systems used on the buoys were rated for the third time after 18 months exposure, and results showed a general correlation. Environmental corrosion is supplemented by abrasion of buoys by mooring naval vessels. Three of the buoys were cathodically protected with a sacrificial magnesium anode, a control head, and a zinc anode, united directly to the ground cable, was substituted for the magnesium and potentials were increased to the desired magnitude.
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