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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.

TABLE OF CONTENTS: Ams2700e pdf free download

Methods

Passivation methods covered by this specification are as follows:

Method 1 – Passivation in Nitric Acid

Method 2 – Passivation in Citric Acid

Either method may be used unless a method is specified by purchaser. Where QQ-P-35 or AMS-QQ-P-35 is specified, 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

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