1、ASD-STAN STANDARD NORME ASD-STAN ASD-STAN NORM prEN 2491 Edition P 1 September 2010 PUBLISHED BY THE AEROSPACE AND DEFENCE INDUSTRIES ASSOCIATION OF EUROPE - STANDARDIZATIONAvenue de Tervuren, 270 - B-1150 Brussels - Tel. + 32 2 775 8126 - Fax. + 32 2 775 8131 - www.asd-stan.orgICS: and will superse
2、de EN 2491:1997 Descriptors: ENGLISH VERSION Aerospace series Molybdenum 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 “A
3、erospace Series“ Prestandard has been drawn up under the responsibility 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 Domai
4、n following member comments. Subsequent to the publication of this Prestandard, 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 agreeme
5、nt of ASD-STAN, it will be submitted as a draft European Standard (prEN) 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 nation
6、al standard and by withdrawing any national standards conflicting with the EN. Edition approved for publication 1 September 2010 Comments should be sent within six months after the date of publication to ASD-STAN Mechanical Domain Copyright 2010 by ASD-STAN prEN 2491:2010 (E) 3 Contents Page Forewor
7、d .3 1 Scope4 2 Purpose of process .4 3 Normative references4 4 Terms and definitions .5 5 Apparatus.5 6 Information for the processor 5 7 Surface roughness of parts prior to application6 8 Surface preparation.6 9 Coating .6 10 Post-treatment .7 11 Removal of the film .7 12 Characteristics, requirem
8、ents and test methods.7 13 Quality assurance8 14 Acceptance 8 15 Re-treatment 9 Foreword This standard was reviewed by the Domain Technical Coordinator 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
9、Manual, this standard has received approval for Publication. prEN 2491:2010 (E) 4 1 Scope This 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
10、 based alloys. 2 Purpose of process To reduce wear, risk of 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,
11、the latest edition of the referenced document (including any 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 decontamina
12、tion of nickel base alloys EN 9100, Quality Management Systems Requirements for Aviation, Space and Defence Organizations TR 4070, Aerospace series Molybdenum disulphide coatings List of commercial products 1) ISO 1463, Metallic and oxide coatings Measurement of coating thickness Microscopical metho
13、d ISO 2431, Paints and varnishes Determination of flow time by use of flow cups 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 2884 (all parts), Paints and varnishes Determination of viscos
14、ity using rotary viscometers ISO 8080, Aerospace Anodic treatment of titanium and titanium alloys Sulfuric acid process ASTM D2510:1983, Standard Test Method for Adhesion of Solid Film Lubricants 2) 1) Published as ASD-STAN Technical Report at the date of publication of this standard by Aerospace an
15、d Defence Industries Association of Europe-Standardization (ASD-STAN), (www.asd-stan.org). 2) Published by: ASTM National (US) American Society for Testing and Materials http:/www.astm.org/ prEN 2491:2010 (E) 5 4 Terms and definitions For the purposes of this document, the following terms and defini
16、tions apply. 3.1 batch parts subjected to the same dry lubricant application at the same time under the same condition 3.2 pre-production parts parts representing future production 5 Apparatus 5.1 For application by dipping Container with a lid, stirring device and temperature control. The apparatus
17、 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 For application by spraying A dry, oil free air fed gun shall be used, with settings adapted to the characteristics of the dry lubricant
18、 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 coated and the automatic displacement of the gun will give a more uniform application. NOTE 2 Use of an aerosol spray does not always e
19、nsure acceptable reproducibility. Moreover, the propellant shall not have any adverse effect on the substrate. 5.3 For curing An oven capable of temperatures prescribed by the lubricant manufacturer. 6 Information for the processor designation of the dry lubricant; number of the material standard an
20、d metallurgical condition of the latter; areas to be processed; thickness of the dry lubricant, if necessary, (see Table 1); duration and temperature of curing. prEN 2491:2010 (E) 6 7 Surface roughness of parts prior to application It shall be specified on the drawing or in the definition documents.
21、 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 and titanium alloys Anodising: ISO 8080, unless otherwise specified. 8.2 Parts in corrosion resisting steel Passivation: EN 2516, unless otherwise s
22、pecified. 8.3 Parts in steel Cadmium plating EN 2133, without chromating. If necessary, the cadmium layer may be phosphated in an accelerated zinc phosphate bath to obtain a uniform and insoluble phosphate coating of a mass per unit area between 1 g/m2 and 1,5 g/m2 (i.e. a thickness of about 0,002 m
23、m). 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 s to 30 s at ambient temperature). 9 Coating 9.1 Product TR 4070 gives a list of Molybdenum disulphide coatings commercial products. Product to
24、be applied shall conform to environmental, work safety and public health European regulations. 9.2 Generality It shall be performed: within 24 h, after surface preparation ; all precautions shall be taken to prevent contamination or corrosion of the parts awaiting treatment; in a clean and dry envir
25、onment, relative humidity between 40 % and 75 %, temperature (20 5) C avoiding any operations liable to contaminate the surfaces to be treated. 9.3 Application by dipping Adjust the viscosity of the bath (see ISO 2431 or ISO 2884) to the value given by the manufacturer of the product to be deposited
26、. 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 for 2 s to 10 s. prEN 2491:2010 (E) 7 Remove the parts at a speed determined by tests on pre-production parts. Drain parts. Dry parts avoiding handling
27、them. 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 deposited. 9.4 Application by spraying Adjust the viscosity (see ISO 2431 or ISO 2884) to the value given by the manufacturer. If necessary, pre-h
28、eat the parts to approx. 50 C. Produce 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
29、 given by the manufacturer of the product to be deposited. 9.5 Other applications Other application methods producing the same quality of deposit may be used (for example: barrel deposition). 10 Post-treatment If the tolerances of the parts necessitate mechanical finishing, it shall be performed by
30、honing, burnishing, barrel finishing or manual 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 solven
31、ts). Following removal of the film, the parts shall be subjected to a visual and dimensional inspection. 12 Characteristics, requirements and test methods See Table 1. prEN 2491:2010 (E) 8 Table 1 Characteristic Requirement a Test method Appearance Uniform colour, a variation of this indicates incor
32、rect distribution of the fillers in 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 Suitable m
33、ethod or ISO 1463 After mechanical finishing (0,005 0,002) mm or with the purchasers agreement, a method based on measurement of the mass of the dry lubricant deposited. In the case of dispute, ISO 1463 shall be applied. Adhesion No flaking, blisters, cracks ASTM D2510 Heat curing The film shall not
34、 be damaged by a brief contact with a solvent. For a maximum of 1 min, gently rub with a pad of cotton-wool impregnated with a solvent (for example methy-ethyl-ketone). a On parts, if not possible, on accompanying test pieces. 13 Quality assurance 13.1 Approval of the processor The processor shall m
35、eet the requirements of EN 9100. 13.2 Process 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 12) shall be carried out on these coated pr
36、e-production parts and/or test pieces, 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 t
37、he purchaser. 14 Acceptance 14.1 Appearance and thickness See Table 1. prEN 2491:2010 (E) 9 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,
38、5. 14.2 Adhesion See 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 purchaser. 15 Re-treatment After agreement of the purchaser, the parts not meeting the requirements may be reprocessed.
