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SAE AMS 2700C Document Information:
Title
Passivation of Corrosion Resistant Steels
SAE International
Publication Date:
Nov 1, 2008
Scope:
Purpose
This specification covers the requirements for a process to
assure removal of free iron or other less noble contaminants from
the surfaces of corrosion resistant steel parts.
Application
The processes defined in this specification have been used
typically to dissolve tramp metallic elements from the surfaces of
corrosion resistant steels to improve their corrosion resistance,
but usage is not limited to such applications.
Classification
Methods
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.
Types
The following types may be specified for Method 1:
Type 1 Low Temperature Nitric Acid with Sodium Dichromate
Type 2 Medium Temperature Nitric Acid with Sodium Dichromate
Type 3 High Temperature Nitric Acid with Sodium Dichromate
Type 4 40% Nitric Acid for Free Machining Steels
Type 5 Anodic, for High Carbon Martensitic Steels
Type 6 Low Temperature Nitric Acid
Type 7 Medium Temperature Nitric Acid
Type 8 Medium Temperature, High Nitric Acid Concentration
Where no type is specified, the processor may use any of the
listed types that meet the requirements given herein.
Classes
Passivation verification classes are as follows:
Class 1
The following types of parts shall be selected for testing in
accordance with 4.3.1.
Fasteners, including nuts, bolts, washers, rivets and related
hardware where a test frequency is not defined in the procurement
documents.
Standard parts defined by drawings labeled AN, MS, NAS or
similar where frequency of test is not otherwise defined.
When specified by purchaser.
Class 2
Frequency of corrosion testing shall be one part per lot.
Class 3
Frequency of testing shall be on a periodic basis.
Class 4
Parts for which AMS-QQ-P-35 or QQ-P-35 is specified shall be
acceptance tested in accordance with 4.3.4.
When no class is specified and neither 1.3.3.1 nor 1.3.3.4
apply, class 2 shall apply.
Safety - Hazardous Materials
While the materials, methods, applications, and processes
described or referenced in this specification may involve the use
of hazardous materials, this specification does not address the
hazards which may be involved in such use. It is the sole
responsibility of the user to ensure familiarity with the safe and
proper use of any hazardous materials and to take necessary
precautionary measures to ensure the health and safety of all
personnel involved.
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