AMS2700E

AEROSPACE

MATERIAL

SPECIFICATION

Passivation of Corrosion Resistant Steels

RATIONALE

AMS2700 REV. E

Issued 2000-03

Revised 2011-11

Superseding AMS2700D

AMS-QQ-P-35

QQ-P-35

AMS2700E is issued to incorporate all changes approved by AMS Committee B by 28 day Limited Scope Ballot closed on

6/14/2011 and which were intended to be reflected in AMS2700D but some of which were inadvertently omitted. A

complete list of each of these changes is listed in 8.17.

1. SCOPE

1.1 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.

1.2 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.

1.3 Classification

1.3.1 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.

1.3.2 Types

The following types may be specified for Method 1:

Type 1

Type 2

Type 3

Type 4

Low Temperature Nitric Acid with Sodium Dichromate

Medium Temperature Nitric Acid with Sodium Dichromate

High Temperature Nitric Acid with Sodium Dichromate

40% Nitric Acid for Free Machining Steels

__________________________________________________________________________________________________________________________________________

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Type 5

Type 6

Type 7

Type 8

AMS2700E

Anodic, for High Carbon Martensitic Steels

Low Temperature Nitric Acid

Medium Temperature Nitric Acid

Medium Temperature, High Nitric Acid Concentration

Page 2 of 17

Where no type is specified, the processor may use any of the listed types that meet the requirements given herein.

1.3.3 Classes

Passivation verification classes are as follows:

1.3.3.1 Class 1

The following types of parts shall be selected for testing in accordance with 4.3.1.

1.3.3.1.1

1.3.3.1.2

1.3.3.1.3

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.

1.3.3.2 Class 2

Frequency of corrosion testing shall be one part per lot.

1.3.3.3 Class 3

Frequency of testing shall be on a periodic basis.

1.3.3.4 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.

1.3.3.5

1.4

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.

2. APPLICABLE DOCUMENTS

The issue of the following documents in effect on the date of the purchase order forms a part of this specification to the

extent specified herein. The supplier may work to a subsequent revision of a document unless a specific document issue

is specified. When the referenced document has been cancelled and no superseding document has been specified, the

last published issue of that document shall apply.