Scope of this guide
Intermediate version: symptom-to-cause triage with the confirm-by column — find the variable, run one change, verify.
Series: finishing.com recurring questions answered with platingclub line practice. Parameters are industry-standard starting ranges — confirm against your supplier TDS.
Triage: symptom → confirm → first move
| Symptom | Likely root | Confirm by | First move |
|---|---|---|---|
| Oily films after cleaning | Concentration low or cold bath | Titration + thermometer | Rebalance to card range |
| Etched or dullened parts | Concentration too high / too hot | Weight-loss check | Dilute; verify card |
| Cleaning slow all day | Bath exhausted by oil load | Titration trend | Dump on trend, add overflow |
| Fumes/boiling at tank edge | Temperature over spec | Thermostat check | Cut heat; verify control |
| Stains after drying | Rinse drag-out from cleaner | Rinse conductivity | Counter-flow rinse audit |
Engineer notes
- One variable per corrective action; verify with the confirm-by column.
- Records beat memory: log every trial on the tank card.
- Two failed actions in a row is a senior call — escalate with your log.
Safety: hot caustic cleaners burn skin and eyes badly. Face shield and apron at addition, add chemicals to water, stir-in fully before loading parts.
FAQ
Titration says fine but parts bead water — next?
Oil load saturation: skimming and overflow; the bath can read in-range and still be exhausted.
Brass parts dull after cleaner — why?
Zinc/brass attack in strong alkaline at heat: milder card for those alloys.
How long should soak take?
By soil, not by clock: heavy stamping oil needs time and agitation, not more powder.