Process Overview for Owners
One page to see the whole surface-finishing line: what happens at each stage, what it costs, and what you have to decide.
Stage by stage, and the owner's decision
1. Forming Workshop
Decide: in-house casting vs bought parts. Drives tooling capex, scrap rate and lead time.
2. Surface Preparation
Decide: automation level of cleaning lines. Drives labour, water use and rework.
3. Plating Workshop
Decide: process mix (barrel / rack / precious) and bath control depth. Drives cost per piece and claims.
4. Painting Workshop
Decide: which coating routes to keep in-house. Drives energy, yield and colour capability.
5. Equipment & Quality
Decide: measurement and maintenance investment. Drives first-pass yield and customer audits.
The money and customer questions
- Investment & Payback
- Plant & Capacity
- Process Selection
- Quality & Customer
- Chemistry & Supply
- Team & Delivery
Technicians: use the shop-floor knowledge map or the search box (try "barrel senior").
The full chain, stage by stage
| Stage | Purpose | Typical control | Failure shows up as |
|---|---|---|---|
| Incoming inspection | Catch casting and stamping defects early | Visual, dimensional sample | Blister under plating weeks later |
| Polishing / deburring | Remove die lines, level the surface | Wheel and compound chart | Grey haze, orange peel |
| Degrease / pretreatment | Remove oil, oxide, passivation | Concentration, temperature, time | Patchy deposit, poor adhesion |
| Base layers (Cu / Ni) | Level, brighten, block corrosion | Thickness, current density | Colour drift, salt-spray failure |
| Decorative layer | Colour and final appearance | Thickness, colour chip | Mismatch between batches |
| Post-treatment | Passivate, seal, dry | Concentration, dwell, dry temp | Fingerprint marks, white corrosion |
Every stage can pass on its own and still fail the finished part. The chain is the product.
Cycle time reality check
- Pretreatment and rinsing usually take longer than the plating itself
- Barrel lines trade cycle time for even thickness - do not compare directly with rack numbers
- Drying is a stage, not an afterthought: wet parts packed warm show water marks
FAQ
Where do most defects actually originate?
Rinsing, handling and pretreatment - not the expensive decorative bath. Audit those first.
Can we run partial chains?
Yes, many plants buy polished blanks and start at plating. The risk moves to incoming inspection: specify the blank condition in writing.