Processes for coating a metal substrate with an electrodeposited coating composition and drying the same

摘要

A process for drying a liquid electrodeposited coating composition applied to a metal substrate is provided. Infrared radiation and warm air are applied simultaneously to the electrodeposited coating composition for a period of at least about 1 minute, the velocity of the air at the surface of the electrodeposited coating composition being less than about 4 meters per second. The temperature of the metal substrate is increased at a rate ranging from about 0.25 DEG C. per second to about 2 DEG C. per second to achieve a peak metal temperature of the substrate ranging from about 35 DEG C. to about 140 DEG C. Infrared radiation and hot air are applied simultaneously to the electrodeposited coating composition for a period of at least about 2 minutes, during which the temperature of the metal substrate is increased at a rate ranging from about 0.2 DEG C. per second to about 1.5 DEG C. per second to achieve a peak metal temperature ranging from about 160 DEG C. to about 215 DEG C., such that a dried electrodeposited coating is formed upon the surface of the metal substrate.