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MIL-DTL-81706B Schematic ( PDF Datasheet ) - ETC

Teilenummer MIL-DTL-81706B
Beschreibung CHEMICAL CONVERSION MATERIALS
Hersteller ETC
Logo ETC Logo 




Gesamt 20 Seiten
MIL-DTL-81706B Datasheet, Funktion
INCH-POUND
MIL-DTL-81706B
25 October 2004
SUPERSEDING
MIL-DTL-81706A
18 February 2002
DETAIL SPECIFICATION
CHEMICAL CONVERSION MATERIALS
FOR COATING 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 materials used in the formation
of coatings by the reaction of the material with the surfaces of aluminum and aluminum alloys.
1.2 Classification. The chemical conversion materials and application methods are of the
following types, classes, material forms, and methods.
1.2.1. Types. The chemical conversion materials are of the following types (see 6.2).
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 6.2).
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 414100B120-1, 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 www.dodssp.daps.mil.
AMSC N/A
AREA MFFP
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MIL-DTL-81706B Datasheet, Funktion
MIL-DTL-81706B
be acceptable, provided that the average of all readings does not exceed the specified maximum
resistance.
3.8 Vertical adherence weight (forms IV and V only). After testing in accordance with
4.5.6, forms IV and V shall have an average adherence weight of 2.8 to 6.5 grams. The materials
shall cling uniformly to the test panel with no visual evidence of excessive runoff or lack of
coverage.
3.9 Storage stability. The storage life of the materials conforming to this specification shall
be not less than 12 months (see 6.7). Products for which storage stability is to be determined
shall be furnished in containers as specified by the qualifying activity. Storage samples shall not
be opened or agitated during the stipulated storage period. After storage, the product shall be
homogeneous, free from precipitate (if a liquid product), be easily mixed or diluted, when
required, and shall conform to all applicable requirements of this specification. Only those
products that have been tested and initially found to meet all applicable requirements of this
specification shall be evaluated for storage stability (see 4.5.7).
3.10 Unit of issue. To interface with existing equipment and system part lists and meet
the required storage characteristics, the units of issue shall be as specified in 3.10.1 and 3.10.2.
3.10.1 Bulk materials. Form I unit of issue shall be one gallon, shipped in plastic lined
containers of up to 55 gallon capacity. Form II unit of issue shall be one pound, shipped in
plastic lined or plastic containers of up to 175 pound capacity. All containers shall be sealed to
prevent moisture intrusion.
3.10.2 Ready-to-use or premeasured materials. Units of issue for forms III and IV shall be
one pint or one quart plastic containers with plastic lined screw cap. Unit of issue for form V
shall be one quart plastic container with plastic lined screw cap. The plastic container shall be
marked with the powder level and the added liquid level. All containers shall be sealed to
prevent moisture intrusion. Unit of issue for form VI, method D, shall be one applicator device.
3.11 Warning label. For type I, forms I through V, the following warning shall appear on
each container:
WARNING: Chemical conversion materials are strongly oxidizing and present a potential
fire and explosion hazard when in contact with flammable materials such as
paint thinners. Avoid storing or mixing these materials in containers that
previously contained flammable products.
Type II chemical conversion materials shall be labeled in accordance with Department of
Transportation (DOT) or National Fire Protection Association (NFPA) regulations for solid and
liquid compositions.
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MIL-DTL-81706B pdf, datenblatt
MIL-DTL-81706B
4.5.3.2 Immersion procedure. Painted panels shall be immersed in distilled water as
follows:
3 panels of each substrate and finish for 24 hours at room temperature.
3 panels of each substrate and finish for 96 hours at 120 ±2 °F (49 ±1 °C).
3 panels of each substrate and finish for 168 hours at 150 ±2 °F (65.5 ±1 °C).
Upon completion of the immersion period, the panels shall be removed from the water, dried
using a clean, dry soft cloth, and be immediately evaluated as specified in 4.5.3.3.
4.5.3.3 Evaluation procedure. Panels prepared in accordance with 4.4.4.1 shall be tested for
paint adhesion in accordance with FED-STD-141, Method 6301.3, except that the scribed area
shall include the original paint, overlap area, and the repair area.
4.5.4 Coating weight (class 1A). Panels prepared as specified in 4.4.3 shall be tested as
specified herein for conformance to the requirements in 3.6. For type I coatings, within 3 hours
after applying the conversion coating, the panels shall be weighed to the nearest 0.1 milligram.
The coating shall not be aged for more than 3 hours since it will become difficult to remove and
the results will be inaccurate. Immediately after weighing, the specimens shall be immersed for
60 seconds in freshly made nitric acid solution, composed of equal parts by volume of
concentrated nitric acid (70 percent HNO3) and deionized water, maintained at room
temperature. Coating removal can be facilitated by brushing the specimen with a clean cotton
swab. For type II coatings, the method specified for type I coatings shall be used, unless an
alternative method is specified by the manufacturer. After removal of the conversion coating,
the specimen shall be rinsed thoroughly in deionized or distilled water, blown dry with clean,
filtered oil-free air, and reweighed. The weight of the chemical conversion film in milligrams
per square foot shall be calculated as follows:
Film Weight = (W1 - W2) x 2.4 for milligrams/ft2 (25.8 for milligrams per square meter)
where: W1 = Initial weight in milligrams
W2 = Final weight in milligrams
4.5.5 Contact electrical resistance (class 3 only). Panels prepared as specified in 4.4 (before
and after the salt spray exposure [see 4.5.1]) shall have the contact electrical resistance of the
coating determined for conformance to 3.7. Test equipment and circuitry as shown on figures 1
and 2 shall be used for measuring the electrical resistance of the class 3 material specimens. The
applied load shall be within one percent of the calculated 200 psi applied pressure. The
contacting electrodes shall be copper or silver-plated copper with a finish not rougher than that
obtained by the use of 000 metallographic abrasive paper. The electrodes shall be flat enough so
that when the load is applied without a specimen between them, light will not be visible through
the contacting surface. The area of the upper electrode shall be one square inch (25 square mm)
and the area of the lower electrodes shall be larger. Ten measurements shall be made on each
panel in the areas shown on figure 3.
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