Auxiliary Anodes and Shielding for Deep Recesses: When and How to Apply Them on Rack Work — 辅助阳极与屏蔽技术：深凹件的应用时机与安装实务.
This is a working reference, not theory: every table and checklist here is designed to be printed and used at the line. It complements the failure case studies published in the Technician Hub with the standard documents those cases eventually produced.
Common Mistakes and How to Avoid Them
| Mistake | Why It Happens | Practical Fix |
|---|---|---|
| 1. Re-using racks without tip checks | Built-up tips shadow and mark parts | Inspect tips every cycle; strip on schedule |
| 2. Random part orientation | Deep recesses face away from anodes | Standardise orientation per part family |
Best Practices
- Rack rebuild station with a strip log
- Orientation diagram per part family
- Spare racked racks ready for changeover
Rack Loading Sequence
- Inspect tips - Build-up and damage (Strip or re-coat per schedule)
- Load per diagram - Orientation and spacing (No improvised positions)
- Check contacts - 2 per part minimum (Loose parts fall and burn)
Diagrams at the loading bench | Rebuild station keeps spare racks
Rack Discipline Reference Data
Practical values for rack plating of zipper pullers and small hardware.
| Parameter | Reference | Why It Matters |
|---|---|---|
| Part spacing | ≥10 mm | Less spacing causes contact marks and shadowing |
| Tip build-up strip | Every 3-5 cycles | Built-up tips block contact and mark parts |
| Contact points | ≥2 per part | Single contacts cause burning and falling parts |
| Orientation | Recesses facing anode side | Standardise per part family diagram |
The re-coat board
Scenario. Racks ran until tips failed visibly, marking whole batches.
Action. A cycle-count board tracked build-up; re-coating became scheduled.
Result. Contact-mark rejects fell sharply and rack life became predictable.
Frequently Asked Questions
How do I know rack tips need re-coating?
Build-up is visible and parts start shadowing or marking. Track cycles: strip or re-coat every 3-5 cycles.
Can I load parts any way that fits?
No. Use the part-family diagram. Recess orientation and 10 mm spacing prevent most marking faults.
Why two contact points minimum?
Single contacts concentrate current (burning) and parts fall when the contact loosens.
Implementation Roadmap
| Step | Frequency |
|---|---|
| Tip inspection into every cycle | Day 1 |
| Re-coat schedule from build-up data | Week 1-2 |
| Fleet standardisation plan | Month 1 |
What Would You Like to Solve?
If you would like this checklist or template adapted to your own line and part mix, contact QLQ — we supply the full equipment and chemistry package along with the working documents that make it run.