Passivation

Although stainless steel is known to be a corrosion resistant alloy, it can become reactive after subjected to certain manufacturing applications such as machining or shot peening. These operations can remove the passive oxide layer thereby exposing iron or transferring iron onto the surface. Passivation is a process used to remove ‘free’ iron from the surface of the stainless steel and render it inactive. The process is performed by first chemically cleaning the stainless steel to remove any soils, oil, and machining lubricants to produce a clean surface. Then the stainless steel is immersed into an acid solution, sometimes fortified with an oxidizer, to dissolve away the free iron and its compounds. This results in the formation of an ‘unreactive’, protective chromium oxide barrier which prevents oxygen and moisture from reaching the iron underneath.

Specification	Specification Description	Company
QQ-P-35	Passivate	Curtis Wright
AMS 2700 TY 2,6,8 CL 1,2,3,4	Passivate	General Electric
ASTM A380	Passivate	General Electric
P4-TE5B	Passivate	General Electric
QQ-P-35	Passivate	General Electric
ASTM A 380	Passivate	Goodrich
ASTM A 967	Passivate	Goodrich
QQ-P-35	Passivate	Goodrich
91547-P6401	Passivate	Honeywell
91547-P6402	Passivate	Honeywell
AMS-QQ-P-35	Passivate	Honeywell
ASTM A967	Passivate	Honeywell
C5041	Passivate	Honeywell
GPS3000-1	Passivate	Honeywell
LHP6010	Passivate	Honeywell
AMS 2700 TY 2,6,8 CL 1,2,3,4	Passivate	Messier Dowty
AMS 2700	ACS-PRS-2203	Northrop Grumman
AMS 2700 TY 2,6,8, CL 1,2,3,4	Passivation Treatments for Corrosion-Resistant Steel	Northrop Grumman
AMS 2700 TY 2,6,8 CL 1,2,3,4	Passivate	Parker Hannifin
AMS-QQ-P-35	Passivate	Parker Hannifin
AMS 2700 TY 2,6,8 CL 1,2,3,4	Passivate	Pratt & Whitney / Raytheon
PWA AP1025	Passivate	Pratt & Whitney / Raytheon
SS 8435	Passivate	Sikorsky
AMS 2700 TY 2,6,8 CL 1,2,3,4	Passivate	UTC Aerospace Sys. - Collins Aerospace
AMS-QQ-P-35	Passivate	UTC Aerospace Sys. - Collins Aerospace
ASTM A-967 (NITRIC ACID TREATMENT)	Passivate	UTC Aerospace Sys. - Collins Aerospace
ASTM A380	Passivate	UTC Aerospace Sys. - Collins Aerospace
CP 14.10	Passivate	UTC Aerospace Sys. - Collins Aerospace
HS 178 CATA	Passivate	UTC Aerospace Sys. - Collins Aerospace
MIL-S-5002	Passivate	UTC Aerospace Sys. - Collins Aerospace
PN 14.10	Passivation of CRES	UTC Aerospace Sys. - Collins Aerospace
QQ-P-35	Passivate	UTC Aerospace Sys. - Collins Aerospace
RPS 15.00-AMS 2700 Method 1 Type 2, 6 & 8	Passivate	UTC Aerospace Sys. - Collins Aerospace
AMS 2700	T 408 Engine Program	Various
AMS 2700 Class All, Method 2	Passivation of Corrosion Resistant Steels	Various
AMS 2700 Ty 2,6,8, Class All, Method 1	Passivate	Various
ASTM A380/A380M Code F,G,H	Passivate	Various
ASTM A967/A967M Nitric 1,2,4 / Citric 1,4 / Practices B,C,D	Passivate	Various
ASTM-A-967 Citric 2	Chemical Passivation Treatments for Stainless Steel Parts	Various

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