Published: Jan 1974
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Seven different paint coating systems were tested on structural steels, high-strength stainless steels, and aluminum alloys. The Pacific specimens were placed on the bottom in 5900 ft of water for six months while the Atlantic specimens were on the bottom at 4050 ft for more than four years.
The epoxy paint system provided good to excellent corrosion protection at both test locations.
The inorganic zinc coating provided adequate protection to the steel specimens for six months in the Pacific Ocean, but would have to be at least 0.010 to 0.020 in. thick to be effective for up to one year.
The two stainless steels Almar 362 and Carpenter 455 were highly susceptible to crevice corrosion when not coated. Uncoated specimens suffered from crevice attack in the same manner as types 302, 303, and 304 stainless steel.
The cathodic protection achieved by the inorganic zinc coating on steel specimens indicates that cathodic protection is a practical method of corrosion control in the deep ocean.
corrosion, epoxy coatings, inorganic coatings, crevice corrosion, cathodic protection, zinc coatings, paints
Lockheed Missiles & Space Company, Inc., Ocean Systems—Naval Architecture & Marine Engineering, Sunnyvale, Calif.