Professional Zinc Alloy Surface Finishing Solutions
Barrel Plating
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Workshop Planning Data
Barrel Plating — Data Zinc Alloy Finishing Managers Need
The automatic barrel plating line plates zinc alloy small parts with copper, nickel, tin and color finishes in batches of 50,000+ pieces, delivering uniform thickness and color at the lowest cost per piece.
650 m²Workshop Area
22 peopleTeam Size
260 kWInstalled Power
1.2-2.5M pcs/dayDaily Output (10 h)
Quality Inspection & Control
| Check item | Method | Acceptance standard |
|---|---|---|
| Coating thickness | X-ray fluorescence / coulometric | Per spec: Cu 3-8 μm, Ni 3-10 μm, Sn 3-6 μm |
| Adhesion | Bend / peel / thermal shock | No flaking at 150 °C × 30 min |
| Color match | Colorimeter ΔE / master | ΔE ≤ 1.5 vs approved master |
| Salt spray | NSS chamber | 12-72 h per finish spec |
| Pitting / roughness | 10× inspection | No pitting, nodules or burnt deposits |
| Thickness uniformity | 5 positions / batch | CV ≤ 10% across barrel load |
Workshop Layout & Floor Area
| Zone | Area |
|---|---|
| Automatic barrel line (12-16 tanks) | 260 m² |
| Chemical storage / dosing | 60 m² |
| Rectifier room | 40 m² |
| QA lab + X-ray | 50 m² |
| Dryer / centrifuge / sorting | 80 m² |
| Rinse & waste treatment | 110 m² |
| Utility & lockers | 50 m² |
| Total workshop | 650 m² |
Manpower & Shift Plan
| Role | Headcount |
|---|---|
| Line operators | 10 |
| Chemical technicians | 3 |
| QC inspectors (incl. X-ray) | 3 |
| Wastewater operator | 1 |
| Supervisor | 1 |
| Maintenance / electrician | 2 |
| Logistics & sorting | 2 |
| Total (2 shifts × 10 h) | 22 |
Power & Utility Demand
| Equipment | Demand |
|---|---|
| Rectifiers 12 V × 500-2000 A (4 sets) | 80 kW |
| Tank heating + cooling | 55 kW |
| Barrel drive motors (12-16) | 24 kW |
| Pumps / filters / dosing | 30 kW |
| Exhaust + scrubber | 22 kW |
| Dryer + centrifuge | 20 kW |
| Wastewater treatment | 18 kW |
| Lighting & auxiliary | 11 kW |
| Installed total | 260 kW |
| Typical running load | ≈ 205 kW |
Production Flow Chart
PretreatmentPolish, degrease, activate
Alkaline CopperStrike layer for adhesion
Acid Copper / Nickel / TinBuild thickness + brightness
Color FinishGold, gun, black, antique etc.
Rinse ChainRecovery → counter-flow → DI
Dry & SortCentrifuge, inspect, pack
Daily Capacity — 10-Hour Operating Day
| Parameter | Value |
|---|---|
| Batch cycle | 25-45 min |
| Load per barrel | 40-80 kg |
| Parts per batch | 50,000-100,000 |
| Batches per 10 h day | 14-20 |
| Daily output | 1,200,000-2,500,000 pcs |
| Monthly output (26 days) | 31-65 million pcs |
Output Value Estimate
| Parameter | Value |
|---|---|
| Plating fee per piece | USD 0.005-0.015 |
| Daily output value (10 h) | USD 7,000-18,000 |
| Monthly output value | USD 180,000-470,000 |
| Annual output value | USD 2,160,000-5,600,000 |
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Barrel parameters that matter most
| Parameter | Effect | Typical adjustment |
|---|---|---|
| Barrel load | Too full = poor contact and uneven plate | Fill 40-60% of barrel volume |
| Rotation speed | Too slow = marks, too fast = bruising | Start slow, raise after 5 minutes |
| Current per barrel | Set by total surface area, not by barrel | Calculate from part count and area |
| Solution flow | Needs to reach the part inside the load | Perforated barrel + pump circulation |
FAQ
Why do parts at the barrel ends plate thicker?
Current path. The contacts sit at the ends, so the load near them sees higher density - rotate and reverse cycle direction.
How do we plate very small parts without losing them?
Fine mesh barrels and a screened rinse. Also count weight in and out - losses are usually handling, not plating.