Troubleshooting Guide to Chromium phosphate processing
Problem, Cause and Remedy
| PROBLEM | CAUSE | REMEDY |
|---|---|---|
| Bath pickles metal and creates dusty coating | Accelerator level too high | Reduce accelerator level by processing aluminum or autodraining* and adjusting the bath |
| Low coating weight | Aluminum concentration too high in bath | Autodrain" and adjust |
| Accelerator too low | Add accelerator | |
| Concentration too low | Add make-up chemical | |
| Total acid too high in relation to chromium concentration | Autodrain* bath and adjust | |
| No coating | Total absence of accelerator in bath | Add accelerator |
| Sludge plugging nozzles | Aluminum concentration in bath too high | Autodrain* bath and adjust |
| Alkaline salts dragged into bath | Increase overflow rate of rinse following cleaner | |
| *Autodraining is a technique whereby the solution is simultaneously being drained and replenished with fresh water and make-up chemical. | ||
D5 Creation
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