We purchase a low carbon steel enclosure that is Zinc plated then covered in yellow chromate. The enclosure is then painted with Sherwin Williams Polane white and then orange. We are having trouble with paint peeling (with the chromate attached to the paint) during our environmental stress screen (-40 °C to +80 °C for 22 cycles, each cycle take about 1 hour). Currently we are trying to add a "cure" time after the chromate step but I'm having trouble finding information on time and temperature recommendations for the "cure". Also, we've seen some paint peeling on enclosure in the field after they passed the in house environmental stress screen. Are we going in the right direction or should we not be painting on top of the chromate.
