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Passivation Type 4

For Passivation QQ-P-35C [from DLA] Type 4, what is the best concentration of nitric acid to be used. Any tips or pre-caution to take note for such process?

Kelvin Lai
- Singapore

Passivation Type IV was under QQ-P-35B, QQ-P-35C obsoleted the Type IV.

Jon Quirt
- Fridley, Minnesota

If you have a copy of QQ-P-35 it will tell you what to do. I hope you are not 'working' to a standard without a copy on hand.

PS look for the standard online, and you should be able to get a copy (you many have to register).

Martin Trigg-Hogarth
surface treatment shop - Stroud, Glos, England

Kelvin:

QQ-P-35 has been cancelled in favor of ASTM A967. There is an SAE/AMSQQP35 [canceled] for the aerospace industry for the moment.

Lee Kremer
Stellar Solutions, Inc.

McHenry, Illinois

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