Continuous chromate-free fluidized-bed pipe coating

Details Continuous chromate-free fluidized-bed pipe coating Continuous chromate-free fluidized-bed pipe coating

C - Chemistry, Metallurgy

23

C

C23C 16/442 (2006.01) B05D 1/24 (2006.01) B05D 7/00 (2006.01) B05D 7/14 (2006.01) C23C 22/73 (2006.01) B05D 3/02 (2006.01) B05D 3/04 (2006.01)

Patent

CA 2435690

Disclosed is a process for chromate-free coating an external surface of a metal pipe by fluidized-bed coating using a pulverulent fusible polymer as a coating material, which comprises: (1) cleaning the pipe in a pretreatment system to remove a grease; (2) applying a primer to the pipe; (3) with a first medium-frequency induction coil, baking the primer, and, when a solvent-containing primer is used, evaporating the solvent; (4) when the solvent- containing primer is used, rapidly dissipating the evaporated solvent, by using a radial fan; (5) preheating the pipe; (6) applying the pulverulent fusible polymer to the pipe, by using a fluidized-bed coating pan; (7) eliminating powder accumulations and eliminating powder deficits and resultant pores on an underside of the pipe, by using internals in the fluidized-bed coating pan composed of an air-flush system above the pipe and metal flow-guide panels below the pipe; (8) smoothing an incompletely molten pulverulent fusible polymer; (9) thoroughly melting the adherent pulverulent fusible polymer and producing a smooth melt, in a melting section; (10) preliminarily cooling the pipe surface, by using an air-flush system; and (11) further cooling and hardening the coating, by using water. The process is especially useful for coating a steel pipe that is an automobile part.

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