Treating automobile bodies

Metal treatment – Compositions – Heat treating

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118304, 118314, 118315, 118316, 118324, 118425, 148 615Z, 204181R, C23F 710

Patent

active

041960238

ABSTRACT:
An automobile body is prepared for painting by suspending it roof uppermost from movable conveyor means and moving it first past spraying means which sprays the body at high energy with a phosphate solution so as to initiate a fine crystalline deposit growth on the exposed body panels. The body is then moved roof uppermost into and along a tank containing a flowing stream of phosphate solution, in which it is immersed to a level about that of the window openings. During this movement, a static head of phosphate solution is created in the body so as to generate a flow of the solution from the interior to the outside of the body by flooding the solution under pressure through the window openings. Crystalline deposit growth over the unimmersed upper portion of the body is sustained by spraying the upper portion with phosphate solution.

REFERENCES:
patent: 2598163 (1952-05-01), Halls
patent: 2598201 (1952-05-01), Williams et al.
patent: 3477870 (1969-11-01), Boretti et al.
patent: 3705817 (1972-12-01), Durr
patent: 3724415 (1973-04-01), Knight
patent: 3839888 (1974-10-01), Durr
Spring, Samuel, "Crystalline Phosphate Coatings for Steel", Metal Finishing, May 1965, pp. 61-62.
Sathyanandham et al., "A Critical Survey of Phosphating Processes", Metal Finishing, Aug. 1967, pp. 48-51.

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