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PDF MIL-DTL-81706B Data sheet ( Hoja de datos )
| Número de pieza | MIL-DTL-81706B | |
| Descripción | CHEMICAL CONVERSION MATERIALS | |
| Fabricantes | ETC | |
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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
3.4 Toxicity. The material and processing baths or solutions shall have no adverse effect
on the health of personnel (see 6.5.2), when used for the intended purpose in accordance with
local process specifications (see 6.1).
3.5 Performance characteristics.
3.5.1 Corrosion resistance. After testing in accordance with 4.5.1 for applicable salt spray
exposure periods specified in table I, the specimens shall show no evidence of corrosion when
compared to unexposed control panels using the naked eye. Areas within 0.25 inch (6.35
millimeters [mm]) from the edges of the panel, the identification markings, and the panel holding
points during processing or salt spray exposure shall not be evaluated. Differences in color
between the test panels and the control panels shall not be cause for rejection.
TABLE I. Schedule for corrosion resistance properties of unpainted chemical films.
Corrosion Resistance
Inspection
Class
Aluminum Alloy To Be
Conversion Coated
Salt Spray
Exposure (Hours)
Qualification
1A
3
2024-T3, 7075-T6
6061-T6
1/ 336
168
Conformance
1A
3
2024-T3
6061-T6
168
168
1/ Exposure time for class 1A, form VI, method D materials shall be 168 hours.
3.5.2 Paint adhesion (wet tape). After application of the epoxy polyamide primer in
accordance with 4.4.4, no intercoat separation shall occur between the paint system, the
conversion coating, or the base metal, when tested in accordance with 4.5.2.
3.5.3 Paint adhesion (wet tape) after repair (applies to nonimmersion methods). After panel
repair and immersion in test fluid as specified in 4.5.3, the scribed panels shall exhibit no peel-
away and be rated at not less than 4A in accordance with ASTM-D3359. There shall be no
blistering of the unscribed coated area.
3.6 Coating weight (class 1A only). When tested in accordance with 4.5.4, type I coating
weight shall be not less than 40 milligrams per square foot (430 milligrams per square meter) of
surface area. Class 1A, type I, form VI, method D coating weight shall be not less than 10
milligrams per square foot of surface area (107.5 milligrams per square meter). Class 1A, type II
coating weight shall be not less than 10 milligrams per square foot of surface area (107.5
milligrams per square meter).
3.7 Contact electrical resistance properties (class 3 only). When tested in accordance with
4.5.5, the contact electrical resistance of aluminum alloy panels treated with class 3 materials
under an applied electrode pressure of 200 pounds per square inch (psi) shall be not greater than
5,000 microhms psi as applied and 10,000 microhms psi after salt spray exposure specified in
4.5.1. Individual readings not greater than 20 percent in excess of the specified maximums shall
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4.4.4.2 Paint adhesion panels (after repair).
4.4.4.2.1 Panels 9 through 17. Panels prepared, cleaned, and conversion coated in
accordance with 4.4.1 through 4.4.3 shall be finished with one coat of epoxy primer conforming
to MIL-PRF-23377. After the primer has dried for 5 hours, a polyurethane topcoat conforming
to MIL-PRF-85285 shall be applied. Panels shall be air dried for 14 days before testing.
4.4.4.2.2 Panels 18 through 26. Panels prepared, cleaned, and conversion coated in
accordance with 4.4.1 through 4.4.3 shall be finished with one coat of epoxy primer conforming
to MIL-PRF-85582. After the primer has dried for 6 hours, a polyurethane topcoat conforming
to MIL-PRF-85285 shall be applied. Panels shall be air dried for 14 days before testing.
4.5 Test methods.
4.5.1 Corrosion resistance. Panels prepared in accordance with 4.4 shall be used for
corrosion resistance testing of class 1A and class 3 materials. The selected specimens shall be
subjected to a 5 percent salt spray test in accordance with ASTM-B117, except that the
significant surface shall be inclined 6 degrees from the vertical. Specimens being qualified or
for lot acceptance (see 4.3.1) shall be exposed for the number of hours specified in table I. After
exposure, specimens shall be cleaned in running water with a temperature not greater than 100
°F (38 °C), blown with clean dry unheated air, and compared with the unexposed specimen for
the presence of corrosion to determine compliance with 3.5.1. Differences in color between test
panels and unexposed control specimens shall not be cause for rejection. Specimens from class
3 material, after exposure and cleaning, shall be allowed to air dry for 24 hours at room
temperature before testing for contact electrical resistance properties in accordance with 4.5.5 for
compliance with 3.7.
4.5.2 Paint adhesion (wet tape). Panels prepared in accordance with 4.4.4.1 shall be tested
for paint adhesion in accordance with FED-STD-141, Method 6301.3.
4.5.3 Paint adhesion (wet tape), after repair (applies to nonimmersion methods).
4.5.3.1 Repair procedure. Panels 9 through 26, finished as specified in 4.4.4.2, shall be
abraded to a shiny substrate using a Scotch Brite wheel or pad (see 6.6), or equivalent, as
approved by the qualifying activity. The abraded area shall be 4 square inches. The remainder
of the topcoat shall be lightly abraded to accept refinish primer. Class 1A, form VI, method D
material shall be applied to the abraded entire panel and conditioned in accordance with the
manufacturer’s instructions. The entire surface of panels 9 through 17 and panels 18 through 26
shall be refinished as specified in the applicable section of 4.4.4.2.
11
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