Metal finishing Q&As since 1989
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Exterior steel painting specification
Q. I would like a painting specification to be used on an exterior carbon steel support that should be applied after the corroded steel has been sand blasted. The existing steel supports a cooling tower in upstate NY. The corrosion was a result of poor water treatment. The exposed steel after will be exposed to a wet environment a large portion of the time.
Andrew DennisonMechanical Contractor - Rochester, New York
2004
A. Mr. Dennison,
I don't know the actual requirements for such a structure, but I'm fairly sure there is an industry standard. There are several ASTM paint standards that you may want to consider for your spec. The following come to mind:
D5146 Testing solvent-borne architectural coatings
D5324 Testing water-borne architectural coatings
ASTM D1654Evaluation of paint in a corrosive environment
ASTM D610Evaluating degree of rusting on painted steel
D6577 Testing industrial protective coatings
ASTM D3359 Paint adhesion
ASTM D2247Testing water resistance of coatings
Some testing can be done in the field and some will need to be done on a sample piece in-house. These are just the testing standards and procedures. For pass-fail criteria, more information is required.
Sincerely,
Oula NahasTechnical Assistance - Rochester, New York
2004
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