1、BS EN 4474:2009ICS 49.040NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDAerospace series Aluminium pigmentedcoatings CoatingmethodsCopyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking
2、 permitted without license from IHS-,-,-This British Standardwas published under theauthority of the StandardsPolicy and StrategyCommittee on 31 March2010 BSI 2010ISBN 978 0 580 67163 0Amendments/corrigenda issued since publicationDate CommentsBS EN 4474:2009National forewordThis British Standard is
3、 the UK implementation of EN 4474:2009.The UK participation in its preparation was entrusted to TechnicalCommittee ACE/61, Metallic materials for aerospace purposes.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to i
4、nclude all the necessary provisionsof a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunityfrom legal obligations.Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or
5、networking permitted without license from IHS-,-,-BS EN 4474:2009EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 4474July 2009ICS 49.040English VersionAerospace series - Aluminium pigmented coatings - CoatingmethodsSrie arospatiale - Revtements alumino-organiques -Mthode dapplicationLuft- und Raum
6、fahrt - AluminiumpigmentierteBeschichtungen - BeschichtungsverfahrenThis European Standard was approved by CEN on 27 May 2009.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard wi
7、thout any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language
8、 made by translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,Fran
9、ce, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NOR
10、MUNGManagement Centre: Avenue Marnix 17, B-1000 Brussels 2009 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 4474:2009: ECopyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reprodu
11、ction or networking permitted without license from IHS-,-,-BS EN 4474:2009EN 4474:2009 (E) 2 Contents Page Foreword 3 1 Scope 4 2 Purpose of process .4 3 Normative references 4 4 Terms and definitions .5 5 Apparatus .5 6 Information for the processor 6 7 Surface roughness of parts prior to applicati
12、on 6 8 Surface preparation .6 9 Coating 7 10 Post-treatment 8 11 Removal of the coating .8 12 Characteristics, requirements and test methods .8 13 Quality assurance 9 14 Acceptance .9 15 Re-coating 9 Copyright European Committee for Standardization Provided by IHS under license with CENNot for Resal
13、eNo reproduction or networking permitted without license from IHS-,-,-BS EN 4474:2009EN 4474:2009 (E) 3 Foreword This document (EN 4474:2009) has been prepared by the Aerospace and Defence Industries Association of Europe - Standardization (ASD-STAN). After enquiries and votes carried out in accorda
14、nce with the rules of this Association, this Standard has received the approval of the National Associations and the Official Services 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 a
15、n identical text or by endorsement, at the latest by January 2010, and conflicting national standards shall be withdrawn at the latest by January 2010. 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 b
16、e held responsible for identifying any or all such patent rights. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Fi
17、nland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Copyright European Committee for Standardization Provided by IHS under licens
18、e with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 4474:2009EN 4474:2009 (E) 4 1 Scope This standard defines the coating methods and characteristics of aluminium pigmented coatings to EN 4473 which may be applied to fasteners in titanium, titanium allo
19、ys, heat resisting nickel base or cobalt base alloys and corrosion resisting steels excluding high strength steels above 1 550 MPa. 2 Purpose of process To reduce galvanic corrosion, wear, risk of seizing and, in some cases, fretting corrosion. 3 Normative references The following referenced documen
20、ts 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. EN 2516, Aerospace series Passivation of corrosion resisting steels and decontami
21、nation of nickel base alloys. EN 3032, Aerospace series Test method for dry film lubricants Thickness measurement. EN 4473, Aerospace series Aluminium pigmented coatings Technical specification. 1) EN 9100, Aerospace series Quality management systems Requirements (based on ISO 9001:2000) and Quality
22、 systems Model for quality assurance in design, development, production, installation and servicing (based on ISO 9001:1994). EN ISO 1463, Metallic and oxide coatings Measurement of coating thickness Microscopical method (ISO 1463:2003). EN ISO 2409, Paints and varnishes Cross-cut test (ISO 2409:200
23、7). EN ISO 2431, Paints and varnishes Determination of flow time by use of flow cups (ISO 2431:1993). EN ISO 2884-1, Paints and varnishes Determination of viscosity using rotary viscometers Part 1: Cone-and-plate viscometer operated at a high rate of shear (ISO 2884-1:1999). ISO 2859-1, Sampling pro
24、cedures for inspection by attributes Part 1: Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection. ISO 8080, Aerospace Anodic treatment of titanium and titanium alloys Sulphuric acid process. 1) Published as ASD Pre-standard at the date of publication of this standard
25、 Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 4474:2009EN 4474:2009 (E) 5 4 Terms and definitions For the purposes of this standard, the following terms and definitions
26、apply. 4.1 batch parts subjected to the same aluminium pigmented coating application at the same time under the same condition 4.2 pre-production parts parts representing future production parts 4.3 definition document document specifying directly or indirectly all the requirements for the parts 4.4
27、 scratch gouged out or scoring of metallic coating 4.5 run localized excess amount of coating to the extent of creating a drip or running of coating 4.6 indentation indent or uneven surface thickness (orange peel) 4.7 flaking particles of coating falling off due to poor adhesion or excess coating 4.
28、8 crack separation of coating due to improper mix or poor adhesion of material 4.9 sampling plan plan according to which one or more samples are taken in order to obtain information and to reach a decision, if possibly 4.10 acceptable quality limit (AQL) maximum percent defective (or the maximum num
29、ber of defects per hundred units) that, for purposes of sampling inspection, can be considered satisfactory as a process average NOTE Variant: quality level which in a sampling plan corresponds to a specified but relatively high probability of acceptance. 5 Apparatus 5.1 For application by dipping C
30、ontainer with a lid, stirring device and temperature control The apparatus shall be capable of applying the specified thickness, for example by controlling the speed of immersion and removal and by draining or centrifuging the parts. Copyright European Committee for Standardization Provided by IHS u
31、nder license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 4474:2009EN 4474:2009 (E) 6 5.2 For application by spraying A dry, oil free air fed gun shall be used, with settings adapted to the characteristics of the aluminium pigmented coating used an
32、d to the shape of the parts to be coated. Preferably a mechanical stirring device in the reservoir. NOTE 1 A device allowing for rotation of the parts to be coated and the automatic displacement of the gun will give a more uniform application. NOTE 2 Use of an aerosol spray is not suitable as it doe
33、s not always ensure acceptable reproducibility. 5.3 For curing An oven capable of curing temperatures prescribed by the coating manufacturer and controlled by periodical calibration 6 Information for the processor The following information is to be given: a) designation of the aluminium pigmented co
34、ating to EN 4473; b) percentage of solvent plus reference of the solvent product; c) number of the material standard and metallurgical condition of the latter; d) areas to be processed; e) thickness of the pigmented coating, if necessary, (see Table 1); f) duration and temperature of curing. 7 Surfa
35、ce roughness of parts prior to application It shall be specified on the drawing or in the definition documents. NOTE The surface roughness is an important factor affecting adhesion and behaviour of the coating in service. 8 Surface preparation 8.1 Parts in titanium and titanium alloys Unless otherwi
36、se specified, anodize to ISO 8080 or degreasing followed by abrasive blasting. 8.2 Parts in corrosion resisting steel Unless otherwise specified, passivate to EN 2516. Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking p
37、ermitted without license from IHS-,-,-BS EN 4474:2009EN 4474:2009 (E) 7 9 Coating 9.1 General It shall be performed: a) within 24 h, after surface preparation ; precautions shall be taken to prevent contamination or corrosion of the parts awaiting treatment; b) in a clean and dry environment, relati
38、ve humidity between 40 % and 75 %, temperature (20 5) C avoiding any operations liable to contaminate the surfaces to be treated. 9.2 Application by dipping Dipping can be performed as follows: a) adjust the viscosity of the solution (see EN ISO 2431 or EN ISO 2884-1) to the value given by the manuf
39、acturer of the product to be deposited; b) if necessary, pre-heat the parts to about 50 C; c) immerse the parts at a speed determined by tests on pre-production parts; d) keep the parts immersed for 2 s to 10 s; e) remove the parts at a speed determined by tests on pre-production parts; f) drain par
40、ts; g) dry parts avoiding handling them; h) if necessary, cure the coating in an oven. The temperature and duration shall comply with the values given by the manufacturer of the product used. 9.3 Application by spraying Spaying can be performed as follows: a) adjust the viscosity of the solution (se
41、e EN ISO 2431 or EN ISO 2884-1) to the value given by the manufacturer; b) if necessary, pre-heat the parts to approx. 50 C; c) produce the coating by applying successive passes, the gun setting and its distance being determined by tests on pre-production parts; d) dry parts avoiding handling them;
42、e) if necessary, cure the coating in an oven. The temperature and duration shall comply with the values given by the manufacturer of the product to be used. 9.4 Other applications Other application methods producing the same quality of deposit may be used (for example: barrel deposition). Copyright
43、European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 4474:2009EN 4474:2009 (E) 8 10 Post-treatment If the tolerances of the parts necessitate mechanical finishing, it shall be performed b
44、y honing, burnishing, barrel finishing or manual brushing according to the size of parts or the batch size. 11 Removal of the coating The following processes are generally used separately or as a combination: a) removal by dry or wet abrasive blasting with appropriate media; b) chemical removal (by
45、pickling or solvents) using products well known for being compatible with the basic metal. Following removal of the coating, the parts shall be subjected to a visual and dimensional inspection. 12 Characteristics, requirements and test methods See Table 1. Table 1 Sub-clause Characteristic Requireme
46、nt aInspection and test method 12.1 Appearance Uniform colour, a variation of this indicates incorrect distribution of the fillers in the coating. Absence of defects such as: scratches, pits, blisters, runs, indentations, foreign bodies, accumulation of particles, lack of uniformity or any other sur
47、face imperfection Visual inspection 12.2 Thickness Unless otherwise specified: 5 m to 13 m Suitable method Qualification: EN ISO 1463 Acceptance: EN 3032 or with the purchasers agreement, a method based on measurement of the mass of the dry coating deposited In the case of dispute, EN ISO 1463 shall
48、 be applied. 12.3 Adhesion No flaking, blisters, cracks: EN ISO 2409, class 1 or less EN ISO 2409 12.4 Curing verification The coating shall not be damaged by a brief contact with a solvent. There shall be no evidence of deposit on the pad. Move three times back and forward with a pad of cotton-wool impregnated with a solvent (for example methyl-ethyl-ketone).aOn parts, if not possible, on accompanying test pieces. Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license fro
