Electrophoretic Processing of Metal Spray Parts

1. Why Choose Tiandubang for Electrophoretic Processing of Metal Spray Parts

Tiandubang specializes in electrophoretic processing of metal spray parts as a hybrid surface treatment. The metal parts are first coated via electrophoretic deposition (EPD), then selectively sprayed for color or aesthetic touch-up.

This combination solves two common problems in metal finishing:

• Spray-only method → poor edge coverage, faster rust from sharp corners
• EPD-only method → limited color range (typically black, grey, clear)

With Tiandubang , buyers get the corrosion performance of EPD and the visual flexibility of spray.

2. Technical Specifications – Electrophoretic Processing of Metal Spray Parts

3. What Makes Tiandubang Different – Key Advantages

3.1 Edge Coverage That Spray Cannot Achieve

• EPD covers internal cavities and sharp corners (>95% coverage)
• Reduces field corrosion claims by over 60% compared to spray-only coating

3.2 Lower VOC and Waste

• Water-based EPD bath → no solvent evaporation during deposition
• Spray step uses high-transfer-efficiency guns (65%+)

3.3 Dimensional Control for Fits and Threads

• Tiandubang applies masking or low-build EPD (12–18 µm) for:Threaded holesPress-fit diametersGrounding contact areas

4. Functional Value for Procurement & Engineering Teams

5. Common Questions About Tiandubang’s Electrophoretic Processing of Metal Spray Parts

Q: Can Tiandubang match a specific RAL or Pantone color on EPD parts?

A. The EPD base layer is typically black or grey. Color matching is achieved via the spray topcoat. We provide spectrophotometer validation (ΔE < 1.0).

Q: Does electrophoretic processing of metal spray parts add significant lead time?
A. Standard production: 7–10 business days for batches under 5,000 parts. EPD cures in-line; spray is done within 24 hours post-cure to ensure adhesion.

Q: How does Tiandubang ensure no coating inside threaded holes?
A. We use silicone plugs or high-temperature tape. Every batch is checked with a go/no-go gauge.

Q: What test reports are provided?
A. Each shipment includes:

• Film thickness report (12 points per rack)
• Cross-cut adhesion (ISO 2409)
• Salt spray summary (upon request, per batch sample)

6. Service Process – From Inquiry to Delivery

6.1 Pre-sales Stage

• Submit 2D/3D drawing + annual quantity + corrosion environment (C2 to C5 per ISO 12944)
• Tiandubang responds with: EPD thickness map + spray area diagram + masking proposal

6.2 Sampling

• First 10 parts processed free of charge (customer pays shipping)
• Sample report includes: dimensional check + coating thickness + adhesion test

6.3 Production & Quality Control

1. Pretreatment (alkaline clean → zinc phosphate → DI rinse)
2. EPD deposition (300–400V DC, 28–32°C bath)
3. Post-rinse & curing
4. 100% visual inspection (500–800 lux lighting)
5. Spray application (manual booth, filtered air)
6. Final QC: film thickness, adhesion, thread gauge check

6.4 Packaging & Shipping

• EPE foam separation within boxes
• Traceability label per batch (date, operator, rectifier log)

7. Pre-sales & After-sales Support – Tiandubang Commitment

8. Core Selling Points – Tiandubang’s Electrophoretic Processing of Metal Spray Parts

• Dedicated EPD line: 3000-liter tank, automated rectifier with ±1% voltage stability
• Spray integration: Two spray booths with downdraft ventilation, quick color change (15 min cleanup)
• Controlled reject rate: <1.5% over 18 months (internal batch records available for customer audit)
• Traceability from bath to shipment: Each batch linked to bath conductivity, pH, voltage log, and spray operator ID

9. Certifications & Customer Trust – Tiandubang

9.1 Certifications

• ISO 9001:2015 (Quality management)
• IATF 16949:2016 (Automotive – in scope for electrophoretic processing)
• ISO 14001:2015 (Environmental)

9.2 Customer References (available under NDA)

• Automotive Tier 2: Brake caliper brackets – 240,000 parts/year, zero corrosion returns in 14 months
• Home appliance: Washing machine counterweight brackets – replaced spray-only coating, cut field failure by 72%

9.3 Auditing

• Customers may schedule quarterly on-site process audits
• Retain samples archived for 24 months, traceable by batch code