1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 2491:2011Aerospace series Molybdenum disulphide drylubricants Coating methodsBS EN 2491:2011 BRITISH STANDARDNational forewordThis British Standard is the UK implementation
2、 of EN 2491:2011. Itsupersedes BS EN 2491:1997 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee ACE/65, Non-metallic materials for aerospace purposes(excluding textiles).A list of organizations represented on this committee can beobtained on request to i
3、ts secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. BSI 2011ISBN 978 0 580 73886 9ICS 49.040Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was pub
4、lished under the authority of theStandards Policy and Strategy Committee on 31 July 2011.Amendments issued since publicationDate Text affectedBS EN 2491:2011EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 2491 June 2011 ICS 49.040 Supersedes EN 2491:1997English Version Aerospace series - Molybd
5、enum disulphide dry lubricants - Coating methods Srie arospatiale - Lubrifiants solides base de bisulfure de molybdne - Mthodes dapplication Luft- und Raumfahrt - Trockenschmierstoffe auf Molybdndisulfid-Basis - Beschichtungsverfahren This European Standard was approved by CEN on 10 March 2011. CEN
6、members are bound to comply with the CEN/CENELEC Internal 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 appli
7、cation to the CEN-CENELEC Management Centre or to any CEN member. 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-CENELEC Man
8、agement Centre has the same status as the official versions. CEN members 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, Nethe
9、rlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2011 CEN All rights of exploitation
10、in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 2491:2011: EBS EN 2491:2011EN 2491:2011 (E) 2 Contents PageForeword 3 1 Scope 4 2 Purpose of process .4 3 Normative references 4 4 Terms and definitions .5 5 Apparatus .5 5.1 For application by dipping 5 5.2 For ap
11、plication by spraying 5 5.3 For curing .5 6 Information for the processor 5 7 Surface roughness of parts prior to application 5 8 Surface preparation .6 8.1 Parts in titanium and titanium alloys .6 8.2 Parts in corrosion resisting steel .6 8.3 Parts in steel .6 9 Coating 6 9.1 Product .6 9.2 General
12、ity .6 9.3 Application by dipping 6 9.4 Application by spraying 7 9.5 Other applications .7 10 Post-treatment 7 11 Removal of the film 7 12 Characteristics, requirements and test methods .7 13 Quality assurance 8 13.1 Approval of the processor 8 13.2 Process approval .8 14 Acceptance .9 14.1 Appeara
13、nce and thickness .9 14.2 Adhesion .9 14.3 Heat curing .9 15 Re-treatment .9 BS EN 2491:2011EN 2491:2011 (E) 3 Foreword This document (EN 2491:2011) has been prepared by the Aerospace and Defence Industries Association of Europe - Standardization (ASD-STAN). After enquiries and votes carried out in
14、accordance 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 publicati
15、on of an identical text or by endorsement, at the latest by December 2011, and conflicting national standards shall be withdrawn at the latest by December 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 sh
16、all not be held responsible for identifying any or all such patent rights. This document supersedes EN 2491:1997. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgar
17、ia, 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, Sweden, Switzerland and the United Kingdom. BS EN 2491:2011EN 24
18、91:2011 (E) 4 1 Scope This European Standard defines the coating methods and characteristics of molybdenum disulphide dry film lubricants which may be applied to parts in titanium, titanium alloys, steel, corrosion resistant steel and nickel based alloys. 2 Purpose of process To reduce wear, risk of
19、 seizing and, in some cases, fretting corrosion. 3 Normative references The 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 an
20、y amendments) applies. EN 2133, Aerospace series Cadmium plating of steels with specified tensile strength 1 450 MPa, copper, copper alloys and nickel alloys EN 2516, Aerospace series Passivation of corrosion resisting steels and decontamination of nickel base alloys EN 9100, Quality Management Syst
21、ems Requirements for Aviation, Space and Defense Organizations EN ISO 1463, Metallic and oxide coatings Measurement of coating thickness Microscopical method EN ISO 2431, Paints and varnishes Determination of flow time by use of flow cups (ISO 2431:1993, including Technical Corrigendum 1:1994) EN IS
22、O 2884 (all parts), Paints and varnishes Determination of viscosity using rotary viscometers ISO 2859-1, Sampling procedures 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
23、titanium alloys Sulphuric acid process ASTM D 2510:1983, Standard test method for adhesion of solid film lubricant1)TR 4070, Aerospace series Molybdenum disulphide coatings list of commercial products 1) Published by: American Society for Testing and Materials (ASTM), 1916 Race Street, Philadelphia,
24、 PA 19103. BS EN 2491:2011EN 2491:2011 (E) 5 4 Terms and definitions For the purposes of this document, the following terms and definitions apply. 4.1 batch parts subjected to the same dry lubricant application at the same time under the same condition 4.2 pre-production parts parts representing fut
25、ure production 5 Apparatus 5.1 For application by dipping Container 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. 5.2 Fo
26、r application by spraying A dry, oil free air fed gun shall be used, with settings adapted to the characteristics of the dry lubricant used and 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 c
27、oated and the automatic displacement of the gun will give a more uniform application. NOTE 2 Use of an aerosol spray does not always ensure acceptable reproducibility. Moreover, the propellant shall not have any adverse effect on the substrate. 5.3 For curing An oven capable of temperatures prescrib
28、ed by the lubricant manufacturer. 6 Information for the processor Designation of the dry lubricant; number of the material standard and metallurgical condition of the latter; areas to be processed; thickness of the dry lubricant, if necessary, (see Table 1); duration and temperature of curing. 7 Sur
29、face roughness of parts prior to application It shall be specified on the drawing or in the definition documents. BS EN 2491:2011EN 2491:2011 (E) 6 NOTE The surface roughness is an important factor affecting adhesion and behaviour of the film in service. 8 Surface preparation 8.1 Parts in titanium a
30、nd titanium alloys Anodising: ISO 8080, unless otherwise specified. 8.2 Parts in corrosion resisting steel Passivation: EN 2516, unless otherwise specified. 8.3 Parts in steel Cadmium plating EN 2133, without chromating. If necessary, the cadmium layer may be phosphated in an accelerated zinc phosph
31、ate bath to obtain a uniform and insoluble phosphate coating of a mass per unit area between 1 g/m2and 1,5 g/m2(i.e. a thickness of about 0,002 mm). NOTE If the part has been de-embrittled, prior activation of the cadmium plating is necessary (i.e. in a potassium cyanide bath 30 g/l to 45 g/l for 15
32、 s to 30 s at ambient temperature). 9 Coating 9.1 Product TR 40702gives a list of Molybdenum disulphide coatings commercial products. Product to be applied shall conform to environmental, work safety and public health European regulations. 9.2 Generality It shall be performed: within 24 h, after sur
33、face preparation; all precautions shall be taken to prevent contamination or corrosion of the parts awaiting treatment; in a clean and dry environment, relative humidity between 40 % and 75 %, temperature (20 5) C avoiding any operations liable to contaminate the surfaces to be treated. 9.3 Applicat
34、ion by dipping Adjust the viscosity of the bath (see EN ISO 2431 or EN ISO 2884) to the value given by the manufacturer of the product to be deposited. If necessary, pre-heat the parts to about 50 C. Immerse the parts at a speed determined by tests on pre-production parts. Keep the parts immersed fo
35、r 2 s to 10 s. 2) Published as ASD-STAN Technical report at the date of publication of this standard. BS EN 2491:2011EN 2491:2011 (E) 7 Remove the parts at a speed determined by tests on pre-production parts. Drain parts. Dry parts avoiding handling them. If necessary, cure the coating in an oven. T
36、he temperature and duration shall comply with the values given by the manufacturer of the product to be deposited. 9.4 Application by spraying Adjust the viscosity (see EN ISO 2431 or EN ISO 2884) to the value given by the manufacturer. If necessary, pre-heat the parts to approximately 50 C. Produce
37、 the coating by applying successive passes, the gun setting and its distance being determined by tests on pre-production parts. Dry parts avoiding handling them. If necessary, cure the coating in an oven. The temperature and duration shall comply with the values given by the manufacturer of the prod
38、uct to be deposited. 9.5 Other applications Other application methods producing the same quality of deposit may be used (e.g. barrel deposition). 10 Post-treatment If the tolerances of the parts necessitate mechanical finishing, it shall be performed by honing, burnishing, barrel finishing or manual
39、 brushing according to the size of parts or the batch size. 11 Removal of the film The following processes are generally used separately or as a combination: removal by dry or wet abrasive blasting with fine grain; chemical removal (by pickling or solvents). Following removal of the film, the parts
40、shall be subjected to a visual and dimensional inspection. 12 Characteristics, requirements and test methods See Table 1. BS EN 2491:2011EN 2491:2011 (E) 8 Table 1 Characteristic RequirementaTest method Appearance Uniform colour, a variation of this indicates incorrect distribution of the fillers in
41、 the film Absence of defects such as: scratches, pits, blisters, runs, indentations, foreign bodies, accumulation of particles, lack of uniformity or any other surface imperfection Visual inspection Thickness Unless otherwise specified (0,01 0,003) mm After mechanical finishing (0,005 0,002) mm Suit
42、able method or EN ISO 1463 or with the purchasers agreement, a method based on measurement of the mass of the dry lubricant deposited In the case of dispute, EN ISO 1463 shall be applied. Adhesion No flaking, blisters, cracks ASTM D 2510 Heat curing The film shall not be damaged by a brief contact w
43、ith a solvent. For a maximum of 1 min, gently rub with a pad of cotton-wool impregnated with a solvent (e.g. methy-ethyl-ketone). aOn parts, if not possible, on accompanying test pieces. 13 Quality assurance 13.1 Approval of the processor The processor shall meet the requirements of EN 9100. 13.2 Pr
44、ocess approval Before beginning production, the processor shall apply the coating on pre-production parts and/or test pieces as agreed between the purchaser and processor. All the tests required by this standard (see Clause 12) shall be carried out on these coated pre-production parts and/or test pi
45、eces, unless otherwise agreed between the purchaser and processor. If the test results are satisfactory for the purchaser, he shall give his written approval to commence production. The process schedule shall not be changed thereafter without the prior agreement of the purchaser. BS EN 2491:2011EN 2
46、491:2011 (E) 9 14 Acceptance 14.1 Appearance and thickness See Table 1. Unless otherwise specified, sampling in accordance with ISO 2859-1: sample size code letter, Table 1, special inspection level S3; simple sampling plan for normal inspection; acceptance quality level (AQL) 1,5. 14.2 Adhesion See
47、 Table 1. The inspection level, the sampling plan and the acceptance quality level according to ISO 2859-1 shall be defined by the purchaser. 14.3 Heat curing See Table 1. The inspection level, the sampling plan and the acceptance quality level according to ISO 2859-1 shall be defined by the purchas
48、er. 15 Re-treatment After agreement of the purchaser, the parts not meeting the requirements may be reprocessed. This page deliberately left blankThis page deliberately left blankBSI is the independent national body responsible for preparing British Standardsand other standards-related publications,
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