Coated metal tubing
AssigneeInternational Telephone and Telegraph Corporation
InventorRussell G. Heyl
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Abstract
Corrosion resistant coatings are applied to metal tubing while substantially continuously moving the metal tubing through a series of stations. The process comprises the sequential steps of flowing by gravity a zinc-rich thermosetting coating suspended in a volatile carrier onto the tubing, the viscosity of the coating composition being such that it flows around and completely covers the external surface of the tubing, removing excess coating by means of an air blower arranged circumferentially around the tubing and sequentially heating the coated tubing first to volatize off the carrier and then more rapidly to crosslink the thermosetting coating composition.
Claims5
Corrosion resistant metal tubing having a first terne coating comprising a lead base alloy containing from 7-20% tin and a second coating completely covering said first coating comprising a crosslinked zinc-rich thermosetting composition.
Dependencies are inferred from the claim text.