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Chemical Conversion Coatings on Aluminum and Aluminum Alloys
AREA MFFP
CANCELLATION NOTICE
This specification has been declared “CANCELLED” by the Aerospace Materials Division, SAE, as of July, 2003, and has been superded by MIL-C-5541. The requirements of the latest issue of MIL-C-5541 shall be fulfilled whenever reference is made to the cancelled AMS-C-5541. By this action, this document will remain listed in the Numerical Section of the index of Aerospace Materials Specifications noting that it is superded by MIL-C-5541. Cancelled specifications are available from SAE upon request.
AEROSPACE MATERIAL
SPECIFICATION
AMS-C-5541A
Issued JUN 1999Cancelled
JUL 2003
Superding AMS-C-5541
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NOTICE
This document has been taken directly from U.S. Military Specification MIL-C-5541E and contains only minor editorial and format changes required to bring it into conformance with the publishing requirements of SAE technical standards. The initial relea of this document is intended to replace MIL-C-5541E. Any part numbers established by the original specification remain unchanged.
The original Military Specification was adopted as an SAE standard under the provisions of the SAE Technical Standards Board (TSB) Rules and Regulations (TSB 001) pertaining to accelerated adoption of government specifications and standards. TSB rules provide for (a) the publication of portions of --``,,``,`````,```,,,`,```,,,``-`-`,,`,,`,`,,`---
unrevid government specifications and standards without connsus voting at the SAE Committee level, and (b) the u of the existing government specification or standard format.
millionaireUnder Department of Defen policies and procedures, any qualification requirements and associated qualified products lists are mandatory for DOD contracts. Any requirement relating to qualified products lists (QPL’s) has not been adopted by SAE and is not part of this SAE technical document.
1.SCOPE:
1.1Scope:
This specification covers the requirements for two class of chemical conversion coatings formed by the reaction of chemical conversion materials and the surfaces of aluminum and aluminum alloys.
This specification is intended specifically to provide components of military weapon systems with maximum corrosion resistance. The coating also provides a surface having better paint adhesion than uncoated aluminum. It is not intended as a general purpo coating for commercial and
decorative applications, (e 6.1).
1.2Classification:
The chemical conversion coatings shall be of the following class, as specified (e 6.2).
1.2.1Class:
Class 1 A - For maximum protection against corrosion, for surfaces to be painted or left unpainted, (e 6.1.1).
Class 3 - For protection against corrosion where lower electrical resistance is required, (e 6.1.2).
2.APPLICABLE DOCUMENTS:
The following publications, of the issue in effect on date of invitation for bids or request for proposal, form a part of this specification to the extent specified herein.
2.1U.S. Government Publications:
Available from DODSSP, Subscription Services Desk, Building 4D, 700 Robbins Avenue,
Philadelphia, PA 19111-5094.
QQ-A-250/4Aluminum Alloy 2024, Plate and Sheet
猴子英文QQ-A-250/11Aluminum Alloy 6061, Plate and Sheet
MIL-P-23377Primer Coating, Epoxy Polyamide, Chemical and Solvent Resistant
蜜蜂的英文单词
MIL-C-81706Chemical Conversion Materials For Coating Aluminum and Aluminum Alloys
MIL-P-85582Primer Coatings: Epoxy, Waterborne
FED-STD-141Paint, Varnish, Lacquer and Related Materials, Methods of Inspection, Sampling and Testing
MIL-STD-105Sampling Procedures and Tables for Inspection by Attributes
2.2ASTM Publications:
Available from ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959.
ASTM B 117Salt Spray (Fog) Testing
2.3Order of precedence:
In the event of a conflict between the text of this document and the references cited herein, the text of this document takes precedence. Nothing in this document, however, superdes applicable laws
and regulations unless a specific exemption has been obtained.
3.REQUIREMENTS:
3.1Chemical conversion materials:
The materials ud to produce a chemical conversion coating shall be approved for the lected class, form and application method in accordance with the qualification requirements of
simensMIL-C-81706 and been accepted for listing on the applicable Qualified Products List (e 6.3).
Replenishing chemicals, such as fluorides, added to a bath to maintain its efficiency, shall in no way degrade the performance of the coating being applied.
3.2Cleaning:
Prior to coating, the ba metal shall be mechanically and/or chemically cleaned such that a water br
eak-free surface is obtained after rinsing (e 6.4). Abrasives containing iron such as steel wool, iron oxide, rouge or steel wire are prohibited for all cleaning operations as particles from them may become embedded in the metal and accelerate corrosion of the aluminum and aluminum alloys.
Treated parts which have become soiled shall be cleaned with materials which will remove the soil without damaging the ba metal, the part, or the conversion coating. If the coating is damaged, the damaged area shall be recleaned and recoated or the part shall be rejected.
3.3Application:
Unless an application method is specified, the chemical conversion materials shall be applied
预告片英语nonelectrolytically by spray, brush or immersion after all heat treatments and mechanical operations such as forming, perforating, machining, brazing and welding have been completed. Asmblies containing non-aluminum parts which may be attacked, embrittled, or damaged in any way by the conversion coating process shall not be coated as asmblies unless the non-aluminum parts are suitably masked.--` ` , , ` ` , ` ` ` ` ` , ` ` ` , , , ` , ` ` ` , , , ` ` -` -` , , ` , , ` , ` , , ` ---
3.4Rework:
Unless otherwi specified by the procuring activity, mechanically damaged areas from which the coating has been removed may be reworked. The damaged areas shall be touched up withsdmt
MIL-C-81706 material approved on the QPL for the applicable class and method of application. The rework area shall not exceed 5 percent of total item surface area. If the area exceeds 5 percent, specific approval must be obtained from the procuring activity before the area can be reworked.
3.5Appearance:
The conversion coating shall be as uniform in appearance as practical (e 6.6). It shall be
continuous and free from areas of powdery or loo coating, voids, scratches, flaws and other
defects or damages which will reduce the rviceability of parts or be detrimental to the protective value and paint bonding characteristics. The size and number of contact marks shall be at a
minimum, consistent with good practice. If specified, contact marks shall be touched up with
MIL-C-81706 material approved on the QPL for the applicable class and method of application to prevent localized corrosion. Clear (colorless) coating shall only be ud when specifically authorized by the procuring activity, (e 6.2 and 6.6).
3.6Corrosion resistance properties:
At the end of 168 hours exposure to the 5 percent salt spray test specified in 4.5.1, specimen panels (e 4.3.3) treated with the applicable class of coating shall meet all of the following corrosion
resistance requirements:
a.No more than 5 isolated spots or pits (e 6.7), none larger than 0.031 inches in diameter, per
一月的英文
specimen panel. Areas within 0.25 inches from the edges, identification markings, and holding points during processing or salt spray exposure shall be excluded. Loss of color shall not be
cau for rejection.
b.No more than 15 isolated spots or pits, none larger than .031 inches in diameter, on the
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combined surface area of all five specimen panels, subjected to the salt spray test.
3.7Paint adhesion properties:
When the production paint system or the paint system specified in 4.3.3.1.1 is applied to the
testmodeapplicable specimen panels (e 4.3.3), no intercoat paration shall occur between the paint
system and the conversion coating or between the conversion coating and the ba metal when tested in accordance with 4.5.2, (e 6.10). If the conversion coated parts do not require painting for end u, the paint adhesion test may be omitted if specifically authorized by the procuring activity (e 6.2).--` ` , , ` ` , ` ` ` ` ` , ` ` ` , , , ` , ` ` ` , , , ` ` -` -` , , ` , , ` , ` , , ` ---
