Pretreatment and cathodic e-coat for automotive components
Suspension and similar components are pretreated and e-coated on a programmed-hoist dipping line: spray and dip degrease, rinses, zinc phosphating at 46–54 °C for 180 s, cathodic e-coat at 30–34 °C for 180 s with 44 tubular anodes, ultrafiltration, then a six-zone oven at 160–180 °C. Line cycle 6 minutes with 3 minutes under current, at 500 kg and up to 38 m² of surface per load.
The numbers behind this configuration
| Hanger envelope | 3,600 × 900 × 1,200 mm, 500 kg |
|---|---|
| Surface per load | Up to about 38 m² |
| Cycle | 6 min line cycle, 3 min under current |
| Phosphating | Zinc, 46–54 °C, 180 s |
| E-coat tank | Carbon steel 4 mm, GRP lined, ≥20 kV, 44 tubular 316L anodes |
| Oven | 160–180 °C, 6 zones × 6 min, 30 min forced cooling |
Figures come from the project records behind the linked projects below, not from a brochure. Your line will differ — these are what we actually built or engineered.
What we supply
- Process sequence and tank sizing from the part mix and the takt
- Rectifier, conductivity control and DI water make-up
- Ultrafiltration and rinse cascade
- Oven, forced cooling and the utilities that go with them
- A single fixed technical annex in one language version as the contract reference
What this application taught us
Quotations for an e-coat line differed by a factor of about 2.3 between suppliers because the process boundary was not the same. The boundary — oven, forced cooling, RO water, installation, in or out — is fixed before any price comparison.
What we need from you
- Part drawings or dimensioned photographs, including the deepest recess to be coated or the full weld list.
- The paint or process specification: 1K or 2K, solvent or waterborne, powder, adhesive or wire, with the required film build or weld size.
- The required output — parts or jobs per hour — and the shift pattern.
- Booth or cell dimensions, the conveyor or hanger arrangement, and the hazardous-area classification your safety engineer has assigned.