coating materials and application methods

DIP COATING

BY THOMAS C. JONES

HENKEL SURFACE TECHNOLOGIES, MADISON HEIGHTS, MICH.

Dip application of a protective coating involves simply immersing a workpieceinto a suitable tank containing the coating material, allowing the part to drainafter withdrawal, and force drying or baking the wet coating to achieve thefinish. Dip coatings are used in many industries for both primer and one-coatfinishes.Thorough cleaning of parts is essential prior to dipping. For optimum quality,a phosphate conversion coating is also recommended.

BENEFITS

Simplicity: Manpower and equipment requirements are minimal. The process iseasily automated.Low Cost: Paint utilization should be relatively high (e.g., greater than 90%transfer efficiency) on properly operated systems, since nonused paint (drainage)is mostly recovered and returned to the system.Ease of Control: Minimally skilled operators can maintain solids, viscosity, andother factors for acceptable application properties.Good Coverage: Except for air bubbles or pockets....

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