1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 4473:2010Aerospace series Aluminiumpigmented coatings forfasteners TechnicalspecificationBS EN 4473:2010 BRITISH STANDARDNational forewordThis British Standard is the UK im
2、plementation of EN 4473:2010.The UK participation in its preparation was entrusted to TechnicalCommittee ACE/12, Aerospace fasteners and fastening systems.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all
3、 the necessaryprovisions of a contract. Users are responsible for its correctapplication. BSI 2010ISBN 978 0 580 65104 5ICS 49.040Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strateg
4、y Committee on 30 September 2010.Amendments issued since publicationDate Text affectedBS EN 4473:2010EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 4473 September 2010 ICS 49.040 English Version Aerospace series - Aluminium pigmented coatings for fasteners - Technical specification Srie arospa
5、tiale - Revtements alumino-organiques pour fixations - Spcification technique Luft- und Raumfahrt - Aluminium pigmenttete Beschichtungen fr Fixierungen - Technische Lieferbedingungen This European Standard was approved by CEN on 5 May 2010. CEN members are bound to comply with the CEN/CENELEC Intern
6、al Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN Management Centre or to any CEN membe
7、r. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as the official versions. CEN member
8、s are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, S
9、weden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2010 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Member
10、s. Ref. No. EN 4473:2010: EBS EN 4473:2010EN 4473:2010 (E) 2 Contents Page Foreword 31 Scope 42 Normative references 43 Terms and definitions .54 Technical specifications .64.1 Product .64.2 Product composition .64.3 Product application .65 Quality assurance 65.1 Qualification .65.2 Acceptance .66 R
11、equirements .6Annex A (normative) Test coupons for paint adhesion test 12Annex B (normative) Test specimen for ohmic resistance measurement . 13Annex C (normative) Lightning current simulation and swept lightning . 14C.1 Lightning current simulation . 14C.2 Test specimens distribution 14C.3 Swept li
12、ghtning (on countersunk head fastener) 14C.3.1 Current waveforms . 14C.3.2 Test method . 15C.3.3 Specimens . 15C.4 Lightning current transfer condition (on protruding head fastener) . 15C.4.1 Current waveforms . 15C.4.2 Test method . 16BS EN 4473:2010EN 4473:2010 (E) 3 Foreword This document (EN 447
13、3:2010) has been prepared by the Aerospace and Defence Industries Association of Europe - Standardization (ASD-STAN). After enquiries and votes carried out in accordance with the rules of this Association, this Standard has received the approval of the National Associations and the Official Services
14、 of the member countries of ASD, prior to its presentation to CEN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by March 2011, and conflicting national standards shall be withdrawn at the latest b
15、y March 2011. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. According to the CEN/CENELEC Internal Regulations, the national standard
16、s organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Pola
17、nd, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. BS EN 4473:2010EN 4473:2010 (E) 4 1 Scope This European Standard defines the qualification test conditions for aluminium pigmented coatings applicable to fasteners in titanium, titanium alloys, nickel base
18、alloys and corrosion resisting steels. The aluminium pigmented coatings are not applicable to fasteners in non-corrosion resistant steels. Temperature class: 315 C 1)Type I : Coating with chromate and a cetyl alcohol lubricant. Type II : Coating without chromate and an cetyl alcohol lubricant. Type
19、III : Coating with chromate, no additional lubricant. Type IV : Coating without chromate, no additional lubricant. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated refer
20、ences, the latest edition of the referenced document (including any amendments) applies. ISO 2409, Paints and varnishes Cross-cut test ISO 9227, Corrosion tests in artificial atmospheres Salt spray tests EN ISO 2812-1, Paints and varnishes Determination of resistance to liquids Part 1: Immersion in
21、liquids other than water (ISO 2812-1:2007) EN 4474, Aerospace series Aluminium pigmented coatings Coating methods EN 6117, Specification for bolts with cetyl alcohol 2)EN 9133, Aerospace series Quality management systems Qualification Procedure for Aerospace Standards Parts TR 4676, Aluminium pigmen
22、ted coatings List of commercial products3)NASM 1312-5, Fastener Test Methods; Method 5: Stress durability 4)NASM 1312-12, Fasteners Test Methods, Method 12: Thickness of metallic coatings 4)MIL-A-8625, Anodic coatings for aluminium and aluminium alloys 5)1) Maximum operating temperature. 2) Publishe
23、d as ASD Prestandard at the date of publication of this standard. 3) Published as ASD Technical Report at the date of publication of this standard. 4) Published by: Aerospace Industries Association, 1000 Wilson Boulevard, Suite 1700, Arlington, VA 22209-3928, USA. 5) Published by: Department of Defe
24、nse (DOD), the Pentagon, Washington, D.C. 20301 USA. BS EN 4473:2010EN 4473:2010 (E) 5 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 production lot product quantity of known composition (aluminium pigmented resin) prepared as one mixing usi
25、ng the same equipment 3.2 seam open surface defect 3.3 blister local convexity caused by a sub-surface inclusion of gas or liquid 3.4 nodule localized buildup or unmixed solid particles 3.5 pit void, hole in the surface as caused, for example, by corrosion 3.6 porosity fine holes or pores within the
26、 coating 3.7 functional surfaces functional surfaces are defined as surfaces in contact with mating structure and threaded portion such as screws: under head bearing surface, shank, lead-in radius and thread surface if applicable; nuts: bearing surfaces, thread surface; spherical washers: bearing su
27、rfaces; swaged collars: all surfaces. 3.8 generic part familly of similar parts such as: screws; nuts and threaded collars; lockbolts; swaged collars; solid rivets; blind bolts; bushes; spherical washers. BS EN 4473:2010EN 4473:2010 (E) 6 4 Technical specifications 4.1 Product TR 4676 gives the list
28、 of aluminium pigmented coating commercial products. Product to be applied shall conform to environmental, work safety and public health European regulations. 4.2 Product composition The preparation method and product composition shall be defined by the manufacturer. The latter must peremptorily not
29、ify its users of any change subsequent to qualification. The product shall not contain chemical compounds as listed below : lead, graphite, type II and IV shall not contain hexavalent chromate. 4.3 Product application Product must be applied in accordance with EN 4474. The resin curing temperature m
30、ust be lower than the last ageing treatment of the material to be coated by at least 10 C. Product may be applied in several coats but shall only have one curing (polymerization), pre heating (flash-off) is acceptable for each coat. 5 Quality assurance 5.1 Qualification EN 9133 All coating qualifica
31、tion tests shall be done on fasteners and according to Table 1. For fastener qualification only 6.1 to 6.3 apply. 5.2 Acceptance Acceptance is done through fasteners lots for appearance, thickness and adhesion. Sampling 3 per generic part or coating application process and test method in accordance
32、with 6.1 (Appearance), 6.2 (Thickness) and 6.3 (Adhesion). 6 Requirements See Table 1. All the tests are to be carried out after application according to EN 4474. When cetyl alcohol is added to type III or IV, they shall be qualified according to type I or II. BS EN 4473:2010EN 4473:2010 (E) 7 Table
33、 1 Section Characteristic Requirement Inspection and test method Sampling for qualification 6.1 Appearance The coating shall be smooth, uniform color, and shall be free of pinholes, porosity, blisters, nodules, pits, or other harmful imperfections. Visual examination 10 per generic part 6.2 Thicknes
34、s External threaded fasteners:The coating thickness shall be between 5 m and 13 m on all functional surfaces as defined in 3.7. Determination of coating thickness shall be made by any of the methods specified in NASM 1312-12. 10 per generic partor coating application process Internal threaded fasten
35、ers: The coating thickness shall be between 5 m and 20 m on all functional surfaces as defined in 3.7. In case of conflict the micrographic examination shall be chosen. 6.3 Adhesion The coating must remain continuously bonded to the basis material. Class 0 ISO 2409 If fastener geometry does not alll
36、ow ISO 2409 adhesion test, the coating must be cut through to the base material on the largest plain surface of the part. Press the tape firmly to the cut on the plain surface of the fastener and remove the tape in one abrupt motion perpendicular to the fastener surface. Any evidence of coating sepa
37、ration when examined at approximately 4X is cause for rejection. 5 per generic part, material type or coating application process 6.4 Heat resistance The coating must remain continuously bonded to the basis material. No powder shall be detected by visual inspection. Class 0 Expose the coated test pa
38、rt to 315 C for 4 h. Air cool and carry out the adhesion test (see 6.3). ISO 2409. 4 screws continued BS EN 4473:2010EN 4473:2010 (E) 8 Table 1 (continued) Section Characteristic Requirement Inspection and test method Sampling for qualification 6.5 Resistance to fuels and hydraulic fluids The coatin
39、g shall not show evidence of blistering or loss of adhesion. Class 0 Immersion according to EN ISO 2812-1 inside : 2 screws Kerosene: Method 1 = Full immersion 1 000 h at 70 C min in Kerosene or equivalent containing 0,2 % methyl cellosolve; Hydraulic fluid: Method 1 = Full immersion 1 000 h at 70 C
40、 min in phosphate ester hydraulic fluid type IV A. Adhesion test as per ISO 2409 6.6 Resistance to stripper agents and to solvents The coating shall no show evidence of blistering or loss of adhesion. Class 0 Immersion of the coated test pieces: 24 h at room temperature in three products: 2 screws b
41、enzylic alcohol and dimer acid; diestone. Adhesion test as per ISO 2409 6.7 Embrittlement 72 h at a tensile load of 80 % of minimum specified UTS, fasteners shall withstand the imposed loading conditions without any breaking or craking. NASM 1312-5 4 screws per material type identified as sensitive
42、6.8 Galvanic corrosion The countersinks and the surface area of the aluminium blocks around the coated fasteners shall show, by visual observations, no more corrosion than the corresponding areas with the cadmium plated fastener control blocks. General surface corrosion on the back of the panels sha
43、ll not be considered in evaluating the protective qualities of the coating. Place coated countersunk head titanium bolts in a 7075 T6 aluminium alloy block defined in Annex A. The assembled block shall be exposed for 336 h in neutral salt spray (NSS) ISO 9227. 3 screws continued BS EN 4473:2010EN 44
44、73:2010 (E) 9 Table 1 (continued) Section Characteristic Requirement Inspection and test method Sampling for qualification 6.9 Paint Adhesion Class 0 at initial stage Class 3 after water immersion Place coated countersunk head bolts in a 7075 T6 aluminium alloy block defined in Annex A: 6 screws Spe
45、cimen manufacture: plate shall be anodised and coated with aircraft primer paint prior to drilling and countersinking; fastener installation; appropriate solvent cleaning + scouring pad + tack rag + chromate free external paint scheme. Tests preparation: Cross cut according to ISO 2409. Adhesion tes
46、ts: on initial stage; after water immersion 336 h at room temperature (Distilled or deionised water with 5,5 1 M.cm). 6.10 Electrical conductivity and lightning The ohmic resistance shall be below 10 m. No overheating above 50 C shall be detected. No sparking shall occurrs during lightning test. The
47、 lightning test is not mandatory. Tests to be performed on 4,8 mm bolt diameter with interference of (40 10) m. The coating to qualify shall be applied to the element on which it is applicable (bolt, nut, lockbolt, collar, ). In case the coating shall be qualified on bolt, the nut to be used shall b
48、e cadmium plated steel. In case the coating shall be qualified on lockbolt, the collar to be used shall be Chemical Conversion Coating on aluminium. In case the coating shall be qualified on nut, the bolt to be used shall be Resin Based Aluminium on titanium. Ohmic resistance to be measured between
49、points A and B (see specimen in Annex B) under a current of 10 A. Swept lightning current and lightning current transfer in accordance with Annex C. 48 per generic part continued BS EN 4473:2010EN 4473:2010 (E) 10 Table 1 (continued) Section Characteristic Requirement Inspection and test method Sampling for qualification 6.11 Interference fit This test is only applicable to the following generic parts: screws; lockbolts. Types I and II: Th
