11. Process Logging and Hull-Cell Testing

Process log

A useful batch log contains:

Field Record —————– ——————————————— Date/time Start and finish Operator Name/initials Part/load ID and quantity Substrate Alloy/material Exposed area ft² or dm² Current A Current density A/ft² Time min Ampere-hours Ah Temperature Start/end pH Start/end Additions Product, lot, amount per supplier procedure Appearance Brightness/color/defects Thickness Measured result Notes Changes or abnormalities

Hull-cell testing

A Hull cell is a small electroplating test cell with angled cathode geometry that exposes a panel to a range of current densities in one test.

It can help distinguish:

• Low-current-density weakness
• High-current-density burning
• Brightness-range changes
• Some contamination patterns
• Effects of approved additive adjustments

Good Hull-cell discipline

1. Use clean, consistent panels.
2. Use a representative bath sample.
3. Control temperature.
4. Use consistent test current and time.
5. Prepare panels identically.
6. Label every panel.
7. Compare with a known-good reference panel.
8. Make only controlled changes.
9. Record the result.

A Hull cell is most powerful when used comparatively. One unexplained panel is less useful than a history of panels tied to bath records.

Proprietary additives

This handbook does not publish additive ingredients or manufacturing formulas. Use the supplier’s approved products and dosing instructions.