HOW TEN GENERIC COATINGS PERFORM OUTDOORS FOR PERIODS UP TO 15 YEARS

The results of a recently published Navy study of the performance of coatings after 15 years' outdoor exposure-show that zinc-rich coatings without topcoats and a modified phenolic coating give long term protection to steel. The study also shows that aluminum pigmentation in the topcoat improves the performance of the protective system. The Navy study covered ten generic types of protective coatings, including vinyl, bituminous, phenolic, saran, synthetic rubber, urethane, coal tar blends, epoxy, zinc-rich and metallized coatings. Other results of the study show that the following coatings will give good protection to steel in a marine atmospheric environment for periods of 4 years or more. The coatings are: vinyl systems with a red lead or strontium chromate primer; coal tar with emulsion topcoat; mica filled asphalt emulsion; phenolic mastic; and an aluminum pigmented coal tar epoxy. The study shows that urethane coating systems with curing agent generally do not give satisfactory protection to steel in a marine environment. Also, zinc chromate pigmented, amine cured primers are not satisfactory for protecting steel in a marine environment. Coatings were evaluated at three different test sites. Port Hueneme, California, Kaneohe Bay, Hawaii and Kwajalein, South Pacific.

• Authors:
  • Mock, J A
• Publication Date: 1974-4

Media Info

• Features: References;
• Pagination: p. 51-53
• Serial:
  • Reinhold Publishing Company
  • Volume: 79
  • Issue Number: 4

Subject/Index Terms

• TRT Terms: Bituminous coatings; Coatings; Epoxy coatings; Materials tests; Metal coatings; Paint; Protective coatings; Rubber coatings; Synthetic rubber; Urethane; Vinyl resins; Zinc coatings
• Old TRIS Terms: Coating performance; Paint testing; Phenolic coatings; Urethane coatings; Vinyl coatings
• Subject Areas: Marine Transportation; Materials;

Filing Info

• Accession Number: 00057306
• Record Type: Publication
• Source Agency: Engineering Index
• Files: TRIS
• Created Date: Aug 28 1974 12:00AM