Title:
 Passivation of Corrosion Resistant Steels
Number:
 AMS 2700
Revision:
 B
Scope:
 This specification covers the requirements for a process to assure removal of free iron or other less noble contaminants from the surface of corrosion resistant steel parts. The processes defined in this specification have been used typically to remove metallic contaminants from the surfaces of corrosion resistant steels using chemically oxidizing methods to prevent injury to the basis metals, but is not limited to such applications.
   
Classification:
  
Methods
Passivation methods covered by this specification are as follows:
Types
The following types are presented for use when Method 1 is specified by purchaser.
   
Details Description Can Do
Method 1 Passivation in Nitric Acid Yes
Method 2 Passivation in Citric Acid Yes
Type 1 Low Temperature Nitric Acid with Sodium dichromate Yes
Type 2 Medium Temperature Nitric Acid with Sodium dichromate Yes
Type 3 High Temperature Nitric Acid with Sodium Dichromate Yes
Type 4 40% Nitric Acid for Free Maching Steels Yes
Type 5 Anodic, for High Carbon Martensitic Steels Yes
Type 6 Low Temperature Nitric Acid Yes
Type 7 Medium Temperature Nitric Acid Yes
Type 8 Medium Temperature, High Nitric Acid Concentration Yes
 
Status:
 Active