AECMA PREN 6118-2007 Aerospace series Process specification Aluminium base protection for fasteners Edition P 1《航空航天系列.过程规范铝保护扣件.P1版》.pdf

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1、ASD STANDARD NORME ASD ASD NORM prEN 6118 Edition P 1 May 2007 PUBLISHED BY THE AEROSPACE AND DEFENCE INDUSTRIES ASSOCIATION OF EUROPE - STANDARDIZATIONAvenue de Tervuren, 270 - B-1150 Brussels - Tel. + 32 2 775 8126 - Fax. + 32 2 763 3565 - www.asd-stan.orgICS: Descriptors: ENGLISH VERSION Aerospac

2、e series Process specification Aluminium base protection for fasteners Srie arospatiale Spcification de procd Protection base daluminium pour fixations Luft- und Raumfahrt Verfahrenspezifikation Aluminumschutz fr Fixierungen This “Aerospace Series“ Prestandard has been drawn up under the responsibil

3、ity of ASD-STAN (The AeroSpace and Defence Industries Association of Europe - Standardization). It is published for the needs of the European Aerospace Industry. It has been technically approved by the experts of the concerned Domain following member comments. Subsequent to the publication of this P

4、restandard, the technical content shall not be changed to an extent that interchangeability is affected, physically or functionally, without re-identification of the standard. After examination and review by users and formal agreement of ASD-STAN, it will be submitted as a draft European Standard (p

5、rEN) to CEN (European Committee for Standardization) for formal vote and transformation to full European Standard (EN). The CEN national members have then to implement the EN at national level by giving the EN the status of a national standard and by withdrawing any national standards conflicting wi

6、th the EN. Edition approved for publication 31 May 2007 Comments should be sent within six months after the date of publication to ASD-STAN Mechanical Domain Copyright 2007 by ASD-STAN Copyright European Association of Aerospace Industries Provided by IHS under license with AECMA Not for ResaleNo re

7、production or networking permitted without license from IHS-,-,-prEN 6118:20072 Contents Page Foreword2 1 Scope 3 2 Normative references 3 3 Classification3 4 Definition requirements 4 5 Qualification and batch acceptance 4 6 List of qualified processes .4 Annex A (normative) Qualification requireme

8、nts 5 Annex B (normative) Paint adherence test.7 Annex C (normative) Electrical conductitvity measurement8 Annex D (normative) Qualification tests 11 Annex E (normative) Test sampling. 12 Annex F (normative) Qualified processes . 13 Foreword This standard was reviewed by the Domain Technical Coordin

9、ator of ASD-STANs Mechanical Domain. After inquiries and votes carried out in accordance with the rules of ASD-STAN defined in ASD-STANs General Process Manual, this standard has received approval for Publication. Copyright European Association of Aerospace Industries Provided by IHS under license w

10、ith AECMA Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-prEN 6118:20073 1 Scope This specification defines the characteristics and the tests required to qualify and control batches of aluminium base protections applicable to fasteners. 2 Normative references The

11、following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 2812-2, Paints and varnishes Determination of res

12、istance to liquids Part 2: Water immersion method. ISO 2819, Metallic coatings on metallic substrates Electrodeposited and chemically deposited coatings Review of methods available for testing adhesion. EN ISO 2409, Paints and varnishes Cross-cut test. EN 6117, Aerospace series Specification for lub

13、rication of fasteners with cetyl alcohol. 1)ASTM G 85, Modified salt spray (fog) testing. 2)MIL-DTL-5541, Aerospace series Specification for lubrication of fasteners with cetyl alcohol. 3)MIL-DTL-83488, Coating, aluminum, high purity. 3)NAS 4006, Aluminium coating. 4)NASM 1312, Fastener test methods

14、. 4)SAE AMS-QQ-P-416, Plating, cadmium electrodeposited. 5)3 Classification The aluminium base protections meeting this specification may be coatings of: pure aluminium, aluminium alloys. These protections enable continuous use up to 400 C. 1) Published as ASD Prestandard at the date of publication

15、of this standard. 2) Published by: American Society for Testing and Materials (ASTM), 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, USA. 3) Published by: Department of Defense (DoD), the Pentagon, Washington, D.C., 20307, USA. 4) Published by: Aerospace Industries Association of America,

16、Inc. (AIA), 1250 Eye Street, N.W., Washington, D.C. 20005-3924, USA. 5) Published by: Society of Automotive Engineers, Inc. (SAE), 400 Commonwealth Drive, Warendale, PA15096-001 USA. Copyright European Association of Aerospace Industries Provided by IHS under license with AECMA Not for ResaleNo repr

17、oduction or networking permitted without license from IHS-,-,-prEN 6118:20074 4 Definition requirements The fasteners can be protected by any technique listed in Annex F giving the characteristics defined in Annex A which apply to fasteners: with a chromic finish as per MIL-DTL-5541 class 1 A, with

18、cetyl alcohol lubrication per EN 6117. 5 Qualification and batch acceptance 5.1 Qualification of processes Before being used, all aluminium base protection processes must pass the qualification tests (list in Annex D, sampling in Annex E) which serve to check that all the requirements of this specif

19、ication are met. For this, the user must request delivery of the test specimens protected by this process. If possible, these test specimens must be: 6,35 mm (1/4“) diameter for bolts, 4,8 mm diameter for rivets, dash number length equal to or greater than twice the diameter for bolts, in compliance

20、 (except for protection) to American specifications (NAS, MS) if possible. The test specimens subjected to the qualification procedure are representative of a production process. Consequently, the user must be notified in writing of any future changes after the qualification concerning the compositi

21、on of a deposit and the application method (process sheet, installation) and, if necessary, certain characteristics shall be checked in compliance with this specification. NOTE The user reserves the right to perform qualification tests other than those given in this specification to cover specific u

22、tilization conditions of items so protected. 5.2 Qualification of suppliers Independent from the process qualification tests, all suppliers shall be subjected to qualification tests (list in Annex D, sampling in Annex E) intended to prove that they are capable of performing the protection process re

23、quested with the required quality. Orders can only be placed with qualified suppliers. 5.3 Batch acceptance at the suppliers Each batch of fasteners manufactured shall be subject to acceptance tests by the supplier before delivery (list in Annex D, sampling in Annex E). The results of these tests mu

24、st be given on the acceptance report. NOTE A batch is defined as a set of fasteners of similar type, form and dimensions, protected at same time or protected consecutively, without opening of the machine vacuum chamber between two loads. 6 List of qualified processes Process qualification is declare

25、d when all requirements of Annex A are met. The list of processes qualified at present is given in Annex F. Copyright European Association of Aerospace Industries Provided by IHS under license with AECMA Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-prEN 6118:200

26、75 Annex A (normative) Qualification requirements Table A.1 Qualification requirements Requirements Test methods and acceptance criteria Appearance Coating smooth and uniform, without imperfections such as bare spots, porosities, blow holes, etc. Visual Thickness 4 to 12 micrometers Specified thickn

27、ess required on all visible surfaces except for recesses and safety holes. The thickness shall be obtained with a single coat. NASM 1312 Test 12 Adherence of protection Protection must adhere to the base metal, before and after wet aging in oven (98 % relative humidity) for 750 hours at 40 C. Adhere

28、nce test as per ISO 2819: Cross cut test using a square pattern of 1 mm step scribed through the protection and a 3M n250 adhesive tape Requirement: 100 % adherence Resistance to fluids The protected fasteners must be free from damage and loss of adherence when exposed to the following products: Imm

29、ersion of fasteners or protected parts: fuels hydraulic fluids JP 1 HYJET IV or equivalent for 42 days at 70 C in fuels and hydraulic fluids solvents TRICHLORETHANE 111, BALTANE or equivalent strippers Without phenols SPCA PAINTEX 7098 or equivalent for 24 hours at 20 C in solvents and strippers de-

30、icing fluid With phenols: ARDROX 2526 or equivalent for 7 days at 20 C in de-icing fluid Square pattern test as per ISO 2819 Requirement: 100 % Paint adherence Paints must adhere perfectly to an aluminium alloy block comprising protected countersunk head fasteners when application is made as per sch

31、eme specified in Annex B. Adherence must be good before and after: 14 days of water immersion according to ISO 2812-2 except temperature which must be (23 2) C block made of 2024 or 7075 paint and application scheme as per Annex B Square pattern test as per EN ISO 2409: By applying a 3M n250 adhesiv

32、e tape and removing it steadily perpendicularly Requirement: Degree 0 at initial stage Degree 3 after water immersion continued Copyright European Association of Aerospace Industries Provided by IHS under license with AECMA Not for ResaleNo reproduction or networking permitted without license from I

33、HS-,-,-prEN 6118:20076 Table A.1 Qualification requirements (continued) Requirements Test methods and acceptance criteria Resistance to heat Protections must be free from signs of damage and cracks after soaking at specified temperature for 4 hours. Heating: 4 h at (500 15) C cooling in air. Square

34、pattern test as per ISO 2819 Requirement 100 % adherence Galvanic corrosion of aluminium alloy structures The protected fasteners must not be the cause of increased galvanic corrosion when compared to sample cadmium plated fasteners ainstalled in unpainted aluminium alloy parts. Galvanic corrosion i

35、s to be checked for around the countersink, bore and around head. The aluminium protected fasteners and the sample cadmium plated fasteners are to be subjected together to the test opposite. countersunk head fasteners installed with clearance acetic salt spray cycling test for 14 days as per ASTM G

36、85 modified as per NAS 4006 (6 h cycle including):- 45 minutes acetic salt spray - 2 hours in open air - 3 hours 15 minutes soak at 35 C (and 45 % to 90 % relative humidity)Embrittlement Titanium bolts must be free from fractures or incipient fractures when subjected to test opposite test as per NAS

37、M 1312 test No. 5 steel test block TS 1 100 MPa test load: 80 % of minimum ultimate strength of bolt as per specification test time: 72 hours test temperature: (450 10) C Axial tensile fatigue Protected fasteners must have the same axial fatigue strength as the unprotected sample fasteners of the sa

38、me batch as per NASM 1312 test 11 undulating tensile test F/0.1F at ambient temperature fatigue load as per specification of fastener concerned test of 5 protected fasteners compared with 5 unprotected fasteners Electrical conductivity Protections meeting this specification must be conductive Test s

39、pecimens, method and acceptance criteria as per Annex C. Upsetting of rivets Protections meeting this specification and applied to solid rivets must not flake off or crack during the upsetting of these rivets installed as per conditions opposite. After installation, protection must remain smooth and

40、 uniform. 4,8 mm dia. 100 countersunk head rivets installed in 4 mm thick aluminium alloy block (2024 or 7075) 4,9 mm to 5 mm dia. bore Upset head dimensions For L = 9 mm, D = 6 mm to 6,5 mm Before After installation installation Magnification of 10X aTitanium fasteners: compared with steel bolt cad

41、mium plated as per SAE AMS QQ-P-416 type II class 2 Copyright European Association of Aerospace Industries Provided by IHS under license with AECMA Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-prEN 6118:20077 Annex B (normative) Paint adherence test B.1 Applicat

42、ion of paint Scheme No. 1 (interior) Scheme No. 2 b (exterior) degreasing MEK 1 coat primer a drying 7 days at 20 C degreasing MEK wash primer drying: 1 h to 4 h primer drying: 2 h to 24 h finish drying: 7 days at 20 C aICI F 580.2080 SIKKENS S15/90 or CELOMER PAC 33 bPAC 33 + PU 66 (CELOMER) or P60

43、A + F70A or A 0166 + S15/90 + HF (SIKKENS) B.2 Adherence test Square pattern as per EN ISO 2409 Before and after wet aging for 750 hours at 40 C and 98 % relative humidity. Copyright European Association of Aerospace Industries Provided by IHS under license with AECMA Not for ResaleNo reproduction o

44、r networking permitted without license from IHS-,-,-prEN 6118:20078 Annex C (normative) Electrical conductitvity measurement C.1 Electrical conductitvity measurement procedure The tests must be performed on a minimum of 8 test specimens. 1) All test specimens shall be traversed by a current of 0,6 A

45、 and their ohmic resistance recorded. 2) 4 identical batches of tested test specimens shall be made. 3) The test specimens of batch 1 shall be conserved as reference specimens. 4) The test specimens of the second batch shall be measured after they have been traversed by a 50 A current. 5) The test s

46、pecimens of the third batch shall be measured after they have been traversed by a 150 A current. 6) The test specimens of the fourth batch shall be measured after they have been traversed by a 300 A current. NOTE These measurements must mandatorily be made before test specimens are subjected to ligh

47、tning test. 7) The mean of the ohmic resistance values will be calculated on test specimens of batches 1, 2, 3 and 4. This mean must not exceed 3 m and no value must exceed 6 m. 8) Traverse the test specimens of batches 2, 3 and 4 with a lightning current with the following characteristics: Initial

48、stroke: Mean current = 10 K A Rise time to Imax= 10 s Continuing component: Mean current = 100 A Time = 1 s 9) Repeat measurements of steps (4), (5) and (6) with test specimens batches 2, 3 and 4 respectively. These ohmic resistance values shall be forwarded to the mandated body. The lightning strikes are made in a dark room with photographic recording of the two faces of the test specimens. The sparking level is evaluated by comparison with the recordings of acceptable assembly processes for example, cadmium plated bolts. Copyright Eur