AMS2700E

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AEROSPACE

MATERIAL

SPECIFICATION

AMS2700 REV. E

Issued 2000-03

tae是谁Revid 2011-11

Superding AMS2700D

A MS-QQ-P-35

QQ-P-35

Passivation of Corrosion Resistant Steels

RATIONALE

AMS2700E is issued to incorporate all changes approved by AMS Committee B by 28 day Limited Scope Ballot clod 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 the changes is listed in 8.17.

1. SCOPE

1.1 Purpo

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 process defined in this specification have been ud 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

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1.3.1 Methods

Passivation methods covered by this specification are as follows:

Method 1 - P assivation in Nitric Acid

扬州补习Method 2 - P assivation in Citric Acid

Method 1 shall be ud 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 u any of the listed types that meet the requirements given herein.

1.3.3 Class

互动英文Passivation verification class are as follows:

coverage

1.3.3.1 Class

The following types of parts shall be lected 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 otherwi

defined.

1.3.3.1.3 When specified by purchar.

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 process described or referenced in this specification may involve the u of hazardous materials, this specification does not address the haz

ards which may be involved in such u. It is the sole responsibility of the ur to ensure familiarity with the safe and proper u 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 purcha order forms a part of this specification to the extent specified herein. The supplier may work to a subquent revision of a document unless a specific document issue is specified. When the referenced document has been cancelled and no superding document has been specified, the last published issue of that document shall apply.

2.1 SAE Publications

Available from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or 724-776-4970 (outside USA), www.sae.

C hemical Process Test Specimen Material

AS2390

2.2 ASTM Publications

Available from ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959, Tel: 610-832-9585, www.astm.

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

3.1.2.1

P assivation shall be accomplished by immersion in a bath in accordance with Table 1. When permitt

ed by the cognizant engineering organization, other nitric acid solutions may be ud. See 8.13.

3.1.2.2 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