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AEROSPACE MATERIAL SPECIFICATION AMS 2482C Issued APR 1989Revid AUG 2000Superd
ing AMS 2482B Hard Coating Treatment of Aluminum Alloys Teflon-Impregnated or Codeposited 1.SCOPE:
1.1Form:
This specification establishes the engineering requirements for producing a hard, teflon-impregnated
or codeposited teflon-aluminum oxide coating on aluminum alloys and the properties of such
coating.
1.2Application:
周公解梦火This process has been ud typically to increa, by the formation of a den, teflon-impregnated
aluminum oxide or codeposited teflon-aluminum oxide layer, surface hardness and resistance to
abrasion and corrosion of aluminum alloy parts containing, in general, less than 5% copper or 8%
silicon or a total of 8% of both. Alloys with higher silicon content alone can be coated satisfactorily
with proper precautions in processing. Careful consideration should be given to the u of this
process on highly-stresd parts becau of the resultant marked lowering of fatigue performance,
and on parts with sharp corners and edges where chipping may result.
1.3Classification:
The process covered by this specification are classified as follows:
Type 1 - Teflon-impregnated aluminum oxide
Type 2 - Codeposited teflon and aluminum oxide
1.3.1
If a specific type is not specified, type 1 shall be supplied.1.4Safety - 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
hazards 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.
Copyright © 2006 SAE International甜菜根的最佳吃法
Reaffirmed APR 2006 --`,,```,,,,````-`-`,,`,,`,`,,`---
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.
2.1ASTM Publications:
Available from ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959.
ASTM B 117Operating Salt Spray (Fog) Testing Apparatus
日记15篇ASTM B 244Measurement of Thickness of Anodic Coatings on Aluminum and of Other
Nonconductive Coatings on Nonmagnetic Basis Metals with Eddy-Current
Instruments
ASTM B 487Measurement of Metal and Oxide Coating Thickness by Microscopical
Examination of a Cross Section
ASTM D 1193Reagent Water
ASTM D 1894Static and Kinetic Coefficients of Friction of Plastic Film and Sheeting
ASTM D 4060Abrasion Resistance of Organic Coatings by the Taber Abrar
3.TECHNICAL REQUIREMENTS:
3.1Preparation:
3.1.1Parts, prior to being coated, shall have clean surfaces, free from water-breaks.
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3.1.2When not otherwi specified by the purchar, the location of electrical contact points shall be as
follows (not applicable to barrel coating).
3.1.2.1For parts which are to be coated all over, locations shall be acceptable to purchar.
3.1.2.2For parts which are not to be coated all over, locations shall be in areas on which plating is not
required or is optional.
3.2Procedure:
Consists of the formation of aluminum oxide, codeposited or impregnated with teflon, on surfaces of parts made the anode in a suitable electrolyte. After coating, parts shall be thoroughly rind in cold, clean water and dried.
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3.3Properties:
Coating on parts shall conform to the following requirements:
3.3.1Thickness: AMS 2482 designates finished coating thickness of 0.002 inch ± 0.0005 (51 µm ± 13).
Other coating thickness may be specified by this specification number and a suffix number
designating the nominal thickness in thousandths of an inch (25 µm). A tolerance of ±0.0005 inch (±13 µm) in thickness of coating will be allowed. Thus, AMS 2482-3 designates a finished coating thickness of 0.003 inch ± 0.0005 (76 µm ± 13).
3.3.1.1Thickness of coating shall be determined on reprentative parts or specimens by microscopic
method, micrometer measurement, eddy-current method in accordance with ASTM B 244 or
ASTM B 487, or other method acceptable to purchar. When micrometer measurement is
ud, specimens for thickness determination shall be of the same alloy as the parts they
reprent and shall be procesd with the parts reprented. The specimens shall be
0.04 x 2 x 4 inches (1.0 x 51 x 102 mm) or of suitable configuration to provide an accurate
一张相片measurement. Micrometer measurements shall be calibrated against microscopic
measurements on specimens procesd to the same nominal coating thickness.
3.3.1.2Coating thickness requirements shall not apply to blind holes or recess with depth greater than
twice the diameter or in open holes with depth greater than ven times the diameter unless a
specific coating thickness is specified in tho areas.
3.3.2Corrosion Resistance: The coated specimens, 0.04 x 3 x 10 inches (1.0 x 76 x 254 mm), fabricated
from an alloy generically similar to the parts reprented shall be washed in ASTM D 1193,
Type IV, water, dried, and then subjected to a 5% salt spray test for 336 hours in accordance with AS
TM B 117, except that the significant surface shall be inclined approximately 6 degrees from vertical. The coated specimens, after salt-spray testing, shall show no more than five isolated
spots or pits, none larger then 1/32 inch (0.8 mm) in diameter, in a total of 30 square inches
(194 cm2) of test area. Areas are excepted if they are within 1/16 inch (1.6 mm) of identification markings and electrical contact marks that remain after processing.
演讲稿开头怎么写3.3.3Abrasion Resistance: Test specimens, 0.04 x 4 x 4 inches (1.0 x 102 x 102 mm), fabricated from
AMS 4037 aluminum alloy sheet or the predominant alloy being procesd when the periodic test specimen is lected, shall be tested in accordance with ASTM D 4060, using CS17 wheels with a 1000-gram load. The wheels shall revolve on the coating at a speed of 70 revolutions per minute for 10,000 cycles. After abrading, the specimens shall be weighed to the nearest milligram to
determine weight loss. Maximum weight loss shall be 40 milligrams for aluminum alloy 2024 and
20 milligrams for all other aluminum alloys.
3.3.4Coefficient of Friction: Coated test specimens fabricated from AMS 4037 aluminum alloy sheet or
the predominant alloy being procesd when the periodic test specimen is lected,
0.04 x 5 x 10 inches (1.0 x 127 x 254 mm) or other suitable configuration to ensure accurate
measurement, shall be tested in accordance with ASTM D 1894 or other method acceptable to purchar. Maximum coefficient of friction shall be 0.15.
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3.4Quality:
Coating, as received by purchar, shall be smooth, uniform in appearance, and free from scratches, chips, and burned areas. Small irregularities at points of electrical contact are permitted. --`,,```,,,,````-`-`,,`,,`,`,,`---
4.QUALITY ASSURANCE PROVISIONS:
4.1Responsibility for Inspection:
The coating processor shall supply all samples for processor’s tests shall be responsible for
performance of all required tests. When parts are to be tested, such parts shall be supplied by
purchar. Purchar rerves the right to sample and to perform any confirmatory testing deemed necessary to ensure that the coating conforms to the requirements of this specification.
4.2Classification of Tests:
4.2.1Acceptance T ests: Thickness (3.3.1) and quality (3.4) are acceptance tests and shall be performed
on each lot.
4.2.2Periodic Tests: Corrosion resistance (3.3.2), abrasion resistance (3.3.3), and coefficient of friction
(3.3.4) are periodic tests and shall be performed at a frequency lected by the processor unless
frequency of testing is specified by purchar.
4.2.3Preproduction Tests: All technical requirements are preproduction tests and shall be performed
prior to or on the initial shipment of coated parts to a purchar, when a change in material and/or processing requires reapproval as in 4.4.2, and when purchar deems confirmatory testing to be required.
橘子的作文4.3Sampling:
Shall be as follows; a lot shall be all coated parts made from the same alloy, procesd to the same coating thickness, and prented for processor’s inspection at one time.
4.3.1For Acceptance Tests: The number of parts sampled shall not be less than shown in Table 1.
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4.3.2For Periodic Tests: Frequency of sampling shall be at the discretion of the processor unless
otherwi specified by purchar.
4.3.2.1
If test panels of an alloy different from that of the parts they reprent are ud, panels shall be procesd under conditions, previously established, which will produce the same coating
thickness as that on the parts they reprent.4.4
Approval: 4.4.1Sample coated parts and/or the coating and control procedure ud to coat parts shall be approved
by purchar before coated parts for u are supplied. When sample coated parts are required, coatings on production parts shall be equivalent to tho on the approved sample parts.
4.4.2The processor shall make no significant change to materials, process, or control factors from tho on which approval was bad, unless the change is approved by the cognizant engineering organization. A significant change is one which, in the judgment of the cognizant engineering organization, would affect the properties or performance of the part.
4.4.3
Control factors shall include, but not be limited to, the following:
Surface preparation methods
Composition limits and temperature limits of anodizing bath
PTFE, how applied for Type 1 coating
Frequency of test of anodizing bath composition
Method for determining coating thickness, and, if micrometer measurements are ud, correlation between measurement and actual thickness
Anodizing voltage limits, and voltage ramp rates where voltage is not constant
Periodic test plan TABLE 1 - Minimum Sampling for Acceptance Tests
Number of
骆驼的英语Parts in Lot Quality Thickness
Up to 7
All 3 8to 15
74 16 to 40
104 41to 110
155111to 300
256301to 500
357Over 500
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