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 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
AMS2700 Passivate Messier Dowty
AMS 2700 Passivation Treatments for Corrosion-Resistant Steel Northrop Grumman
AMS 2700 Passivate Parker Hannifin
AMS-QQ-P-35 Passivate Parker Hannifin
AMS 2700 Passivate Pratt & Whitney
AMS 2700 Passivate UTC Aerospace Systems
AMS-QQ-P-35 Passivate UTC Aerospace Systems
ASTM A-967 (NITRIC ACID TREATMENT) Passivate UTC Aerospace Systems
ASTM A380 Passivate UTC Aerospace Systems
CP14.10 Passivate UTC Aerospace Systems
HS 178 CATA Passivate UTC Aerospace Systems
MIL-S-5002 Passivate UTC Aerospace Systems
PN14.10 Passivate UTC Aerospace Systems
QQ-P-35 Passivate UTC Aerospace Systems
AMS 2700 Method 2 Passivation of Corrosion Resistant Steels Various
ASTM-A-967 Citric 2 Chemical Passivation Treatments for Stainless Steel Parts Various
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