Chem Film Fails Humidity Test: Critical Troubleshooting

Summary for chem film fails humidity test Discussion

Chem film fails humidity test is the core issue, but the thread does not identify a defect in MIL-DTL-5541 itself. Onder Onal asked whether MIL-DTL-5541 Type II trivalent chromium Class 3 clear finish is not holding up and whether a harder finish like anodize is needed. Ron suggested the spec is silent on the cause and said there are too many unknowns to diagnose the failure: whether this is a new or long-running problem, whether it affects all parts or only some, whether the issue is limited to one part style, and whether the work is done in-house or by a supplier. He also raised the possibility that parts may have been missed and not chem-filmed at all, and asked what evidence shows the parts were actually processed to spec. The practical takeaway is that the humidity failure cannot be explained from the information given, and verification of processing and test evidence is the first step before changing to anodize.