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SAE AMS 2700C-2008

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Issued 2000-03

RATIONALE

This document was revised to incorporate the essential requirements of AMS-QQ-P-35.

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 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. --```,,`,,,,````,`,``,``,`,`,`,,-`-`,,`,,`,`,,`---

1.3.3 Classes

Passivation verification classes are as follows:

1.3.3.1 Class

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

1.3.3.1.1 Fasteners, including nuts, bolts, washers, rivets and related hardware where a test frequency is not defined in

the procurement documents.

1.3.3.1.2 Standard parts defined by drawings labeled AN, MS, NAS or similar where frequency of test is not otherwise

defined.

1.3.3.1.3 When specified by purchaser.

1.3.3.2 Class

Frequency of corrosion testing shall be one part per lot.

1.3.3.3 Class

Frequency of testing shall be on a periodic basis.

1.3.3.4 Class

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 When no class is specified and neither 1.3.3.1 nor 1.3.3.4 apply, class 2 shall apply.

1.4 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.

2.1 ASTM Publications

Available from ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959, Tel: 610-832-9585, https://www.wendangku.net/doc/1e11385287.html,.

ASTM B 117 Operating Salt Spray (Fog) Testing Apparatus

ASTM D 1193 Reagent Water

3. REQUIREMENTS

3.1 Procedure

3.1.1 Passivation shall be performed only on surfaces free from water breaks and visible rust or scale. See 8.8.

3.1.2 Method 1 - Passivation in Nitric Acid

3.1.2.1Passivation shall be accomplished by immersion in a bath in accordance with Table 1. When permitted by the

cognizant engineering organization, other nitric acid solutions may be used. See 8.13.

3.1.2.2 Iron concentration in the passivating bath shall not exceed 0.5 weight percent.

3.1.2.3 When a specific passivation type is not specified, Table 4 may be consulted for recommended types.

TABLE 1 - METHOD 1 PASSIVATION TYPES

Type Feature Value

1 Bath Composition 20 to 25% by volume of HNO3