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SAE AMS 2700B Document Information:
Title
Passivation of Corrosion Resistant Steels
SAE International
Publication Date:
Feb 1, 2004
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 remove metallic
contaminants from the surfaces of corrosion resistant steels using
chemically oxidizing methods to
prevent injury to the basis metals, 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 purchaser.
Types: The following types are presented for use when Method 1 is
specified by purchaser:
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, unless citric acid passivation in
accordance with Method 2 is acceptable
to purchaser.
Classes: Passivation verification classes are as follows:
Class 1: The following types of parts shall be verified by testing for
passivity on a statistical
sampling frequency basis.
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 labelled 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.
For parts other than fasteners and standard parts, class 2 shall apply
unless another class is
specified by purchaser.
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.
Keywords:
- Passivate
- Passivation
- Test Method
- Corrosion Resistance
- Steel
- Corrosion Resistant Steel
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