Coating composition for protecting inner surface of tubes in heat exchangers
AssigneeSumitomo Light Metal Industries, Ltd.
InventorsKoji Nagata, Shiro Sato, Akio Ogiso
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Abstract
Anti-corrosive coating composition mainly applied to the inner surface of a copper alloy made heat exchanger tube, employed in heat changers, of relatively small diameter and of large length. The composition is prepared by adding an aminoalkoxysilane compound or a combination of plural aminoalkoxysilane compounds at a ratio of 0.1-5% by weight to a film-forming coating composition constituting of as a base substance thereof an organic polymer resin selected from a group consisting of alkyl resin, vinyl resin, polyurethane resin, epoxy resin, and acrylic resin. The composition is preferably applied by means of spray coating method.
Claims7
A heat exchanger tube having a small diameter in the order of 10-40 mm and a large length in the order of 3-40 m and provided on the inner surface with an artificial protective film less than 50.mu. in thickness, not more than 0.0001 m.sup.2 h.degree.C./Kcal in fouling factor and not less than 5000 .OMEGA. cm.sup.2 in polarization resistance, said artificial protective film being formed by a spray coating of a coating composition prepared by adding at least one aminoalkoxysilane compound at a ratio of 0.1-5% by weight to a liquid coating composition including as a film-forming material at least one organic polymer resin selected from a group consisting of alkyd resin polyurethane resin, epoxy resin, and acrylic resin.
Dependencies are inferred from the claim text.