The invention relates to an energy-saving
coating process which is characterized by comprising the following steps: carrying out surface treatment before painting;
coating cathodic electrophoretic priming;
drying priming paint, keeping the workpiece temperature to be 160 DEG C to 180 DEG C for 20 min and cooling;, sanding the priming and scouring; spraying PVC car bottom and sealing
welding line;airing for 20 min; floating coat
spray coating; airing for 7 to 15 min;
coating finishing coat spray or spraying
metal base paint; airing for 10 min; spraying finishing
varnish; airing for7 to 15 min;and
drying coated film; keeping workpiece temperature to be 140 DEG C to 150 DEG C for 20 min and cooling. PVC glue and a plurality of
layers of coating adopt the energy-saving process technology with wet-on-wet coating, so that
drying devices on the coating line are saved. Compared with a traditional three-coating
coating system, the invention simplifies the coating process, reduces coating device investment and occupation area, saves
heating energy of the coating line, reduces the product coating cost, and enhances the market competitiveness of car products.