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Aerospace Material Specification

[AMS 2700 E]

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This specification covers the requirement for a process to assure removal of free iron or other less noble contaminates from the surfaces of corrosion resistant steel parts.

Passivation methods covered by this specification are as follows:

Method 1: Passivation in Nitric Acid

Method 2: Passivation in Citric Acid

Method 1 shall be used unless Method 2 is authorized by the cognizant engineering organization.

More details (pdf)