| 1. |
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 |
| 2. |
Dusts on coating surface are removed by air ionizing blowers. |
| 3. |
Electrostatic spray applied flash primer with dry film thickness 5-8 microns. |
| 4. |
Electrostatic spray applied PVDF top coat with dry film thickness 25-30 microns. |
| 5. |
Coated parts are thermal cured with metal surface temperature 230 - 240 for
10-15 minutes. |
| 6. |
Quality inspection for coating layer. |
