||12 Stages Chemical Pretreatment
||Step 1 - Alkaline degreasing
Step 2 - Tap water rinsing
Step 3 - Tap water rinsing
Step 4 - Etching & Desmutting
Step 5 - Tap water rinsing
Step 6 - Tap water rinsing
Step 7 - Chromate conversion coating
Step 8 - Deionized water rinsing
Step 9 - Deionized water rinsing
Step 10 - Deionized water rinsing
Step 11 - Drying
Step 12 - Quality inspection for chemical pretreatment
||Dusts on coating surface are removed by air ionizing blowers.
||Electrostatic spray applied polyurethane top coat with dry film thickness 25-30 microns.
||Coated parts are thermal cured with metal surface temperature 60 - 120 for 15-30 minutes. If coated parts cannot be baked (e.g. low softening point materials, over-size metal parts), they can be air-dried at room temperature by adding air-dry activator into the polyurethane top coat ( 2 component system)
||Quality inspection for coating layer.