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PDF MIL-DTL-5541F Data sheet ( Hoja de datos )
| Número de pieza | MIL-DTL-5541F | |
| Descripción | CHEMICAL CONVERSION COATINGS | |
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NOT MEASUREMENT
SENSITIVE
MIL-DTL-5541F
11 July 2006
SUPERSEDING
MIL-C-5541E
30 November 1990
DETAIL SPECIFICATION
CHEMICAL CONVERSION COATINGS
ON ALUMINUM AND ALUMINUM ALLOYS
This specification is approved for use by all Departments and Agencies of the Department
of Defense.
1. SCOPE
1.1 Scope. This specification covers chemical conversion coatings formed by the reaction
of chemical conversion materials with the surfaces of aluminum and aluminum alloys.
1.2 Classification. The chemical conversion coatings are of the following types and
classes.
1.2.1 Types. The chemical conversion coatings are of the following types (see 3.1):
Type I – Compositions containing hexavalent chromium.
Type II – Compositions containing no hexavalent chromium.
1.2.2 Classes. The materials, which form protective coatings by chemical reaction with
aluminum and aluminum alloys, are of the following classes (see 6.1 and 6.4).
Class 1A - For maximum protection against corrosion, painted or unpainted.
Class 3 - For protection against corrosion where low electrical resistance is required.
Comments, suggestions, or questions on this document should be addressed to: Commander,
Naval Air Warfare Center Aircraft Division, Code 491000B120-3, Highway 547, Lakehurst,
NJ 08733-5100 or emailed to [email protected]. Since contact information can
change, you may want to verify the currency of this address information using the ASSIST
Online database at http://assist.daps.dla.mil.
AMSC N/A
AREA MFFP
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3.7 Electrical contact resistance of class 3 coatings. Electrical contact resistance testing
shall be as specified in the contract or order (see 6.4). The test method, frequency of testing, and
required resistance values shall be specified by the acquisition activity to meet the needs of a
particular application (see 6.1.2.1).
3.8 Chemical analysis of the conversion solution. Chemical analysis of the conversion
solution shall consist of concentration, pH, and temperature evaluations to determine that the
bath is within the ranges specified by the chemical manufacturer (see 6.11).
3.9 Workmanship. The chemical conversion coatings covered by this specification shall be
produced by treatments and processes that produce coated components as specified in this
specification.
4. VERIFICATION
4.1 Classification of inspections. The inspection requirements specified herein are
classified as follows:
a. Process control inspection (see 4.2).
b. Conformance inspection (see 4.3).
4.2 Process control inspection.
4.2.1 Process control tests and solution analysis. Test specimens shall be tested in
accordance with table I and 4.2.1.1. In addition to the tests in table I, solution analysis shall be
performed on all the processing solutions in the chemical conversion line (see 3.8) to verify that
the chemical concentrations are within ranges established for optimum performance (see 6.11
and 6.14). Process control tests are conducted to determine compliance of the chemical
conversion coatings with the requirements of this specification and are acceptable as evidence of
the properties being obtained with the equipment and procedures employed.
TABLE I. Process control tests.
Tests
Corrosion
resistance
Wet tape
adhesion
Electrical
contact
resistance
Class
1A
3
1A
3
3
Number of
test
specimens
5
5
2
2
5
Test
specimen
preparation
paragraph
4.2.2
4.2.2
4.2.2-4.2.2.1
4.2.2-4.2.2.1
4.2.2
Requirement
paragraph
3.6.1
3.6.1
3.6.2
3.6.2
3.7
Test
paragraph
4.4.1
4.4.1
4.4.2
4.4.2
4.4.1
5
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MIL-DTL-5541F
type I materials, existence of a coating can be verified by using a simple spot test specified in
ASTM-B449. For type II materials, existence of a coating should be verified per the
manufacturer’s recommendation
6.9 Determination of a corrosion spot or pit. As a general rule, a corrosion spot or pit
usually displays a characteristic tail or line, however, any visible corrosion or pitting except
scratches or substrate surface defects is to be counted..
6.10 Test specimens (2024-T3). Due to high copper content, 2024-T3 aluminum alloy test
specimens are more susceptible to salt spray failure than 6061-T6 aluminum alloy test specimens
(see 4.2.2).
6.11 Chemical analysis of the conversion solution. Note that many conversion materials do
not react sufficiently with aluminum surfaces at low temperatures. Conversion coating of parts
in an unheated facility, such as a hangar, during colder periods of the year is not recommended.
6.12 Paint adhesion. Coated parts should be allowed to dry in accordance with the
chemical manufacturer’s recommendation before they are subsequently painted or adhesion
failures may occur. When coated parts are stored for extensive periods before painting, they
should be cleaned in accordance with 3.2 to reactivate the surface by removing dust particles.
Excessively thick coatings may result in paint adhesion problems, such as blistering, due to
higher amounts of soluble material under the paint.
6.13 Paint compatibility. Compatibility problems between conversion coatings and certain
Chemical Agent Resistant Coatings (CARC) have been reported.
6.14 Temperature effects on corrosion protection. Unpainted conversion coatings will
commence losing corrosion resistance properties if exposed to temperatures of 140 ºF (60 ºC) or
higher, during drying, subsequent fabrication, or service. As temperatures and exposure times
increase, the corrosion protection of unpainted conversion coated parts decreases. The reduction
is believed to result from the coating dehydrating and the resulting insolubility of the chromates
within the coating.
6.15 Solution analysis documentation. Documentation of the history of each processing
bath, showing additions of replenishing chemicals to the bath and the results of all solution
analyses performed must be maintained. Testing of the solution should be consistent with best
industry practices and manufacturer’s recommendations. Upon request of the acquisition
activity, such records, as well as reports of the test results, should be made available. These
records must be maintained for not less than one year after completion of the contract or order.
6.16 Shelf life. This specification covers items where shelf life is a consideration. Specific
shelf-life requirements should be specified in the contract or purchase order. The shelf-life
codes are contained in the Federal Logistics Information System Total Item Record. Additive
information for shelf-life management may be obtained from DoD 4140.27-M, Shelf-life
11
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