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Coating Galvanized Steel
Final rept. Sep 1982-Oct 1985
NAVAL CIVIL ENGINEERING LAB PORT HUENEME CA
Pagination or Media Count:
An experiment was conducted to determine the factors that contribute to deterioration on coatings on galvanizing and how to obtain better coating performance. Variables included six surface treatments, two weathering variations, and five chemical compositions. Coating properties measured were initial bonding to galvanizing and salt fog resistance. Significant conclusions were 1 was h priming improved both bonding strength of coatings to unweathered galvanizing and salt fog resistance of coatings to both weathered and unweathered galvanizing no other surface treatment was beneficial, 2 weathering of the galvanizing before coating generally reduced bonding but improved salt fog resistance, 3 the epoxy system performed best of all and did not require wash priming for good performance, and 4 the zinc chromate primer improved salt fog resistance of the alkyd system, but the zinc dustzinc oxide primer did not.
APPROVED FOR PUBLIC RELEASE