1、BRITISH STANDARD AEROSPACE SERIES BS EN 2497:1990 Specification for Dry abrasive blasting of titanium and titanium alloys This European Standard EN 2497 has the status of a British Standard UDC 621.924.9:621.795:669.295:629.7BSEN2497:1990 This British Standard was published under the authorityofthe
2、Board of BSIandcomes into effect on 28 September1990 BSI 09-1999 The following BSI references relate to the work on this standard: Committee reference ACE/44 Draft for comment 88/70231 DC ISBN 0 580 18679 2 Cooperating organizations The European Committee for Standardization, under whose supervision
3、 this European Standard was prepared, comprises the national standards organizations of the following Western European countries. Austria Oesterreichisches Normungsinstitut Belgium Institut belge de normalisation Denmark Dansk Standardiseringsraad Finland Suomen Standardisoimisliito, r.y. France Ass
4、ociation franaise de normalisation Germany Deutsches Institut fr Normung e.V. Greece Hellenic Organization for Standardization Iceland Technological Institute of Iceland Ireland National Standards Authority of Ireland Italy Ente Nazionale Italiano di Unificazione Luxemburg Inspection du Travail et d
5、es Mines Netherlands Nederlands Normalisatie-instituut Norway Norges Standardiseringsforbund Portugal Instituto Portugus de Qualidade Spain Asociacin Espaola de Normalizacin y Certificacin Sweden Standardiseringskommissionen i Sverige Switzerland Association suisse de normalisation United Kingdom Br
6、itish Standards Institution Amendments issued since publication Amd. No. Date of issue CommentsBSEN2497:1990 BSI 09-1999 i Contents Page Cooperating organizations Inside front cover National foreword ii Brief history 2 Text of EN 2497 3 National appendix A Inside back coverBSEN2497:1990 ii BSI 09-19
7、99 National foreword This British Standard has been prepared under the direction of the Aerospace Standards Policy Committee and is the English language version of EN2497 “Aerospace series. Dry abrasive blasting of titanium and titanium alloys” published by the European Committee for Standardization
8、 (CEN). EN2497 was produced as a result of international discussion in which the UK took an active part. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Stan
9、dard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, theEN title page, pages2to4, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendm
10、ents incorporated. This will be indicated in the amendment table on the inside front cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 2497 January 1989 UDC: 621.924.9:621.795:669.295:629.7 Key words: Aircraft industry, titanium, titanium alloys, surface treatment, sanding English version A
11、erospace series Dry abrasive blasting of titanium and titanium alloys Srie arospatiale. Sablage sec du titane et des alliages de titane Luft- und Raumfahrt-Reihe. Trockenstrahlen von Titan und Titanlegierungen This European Standard was accepted by CEN on1988-03-17. CEN members are bound to comply w
12、ith the requirements of CEN 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 application to the CEN Cen
13、tral Secretariat 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 CEN Central Secretariat has the same status as
14、 the official versions. CEN members are the national standards organizations of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxemburg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Co
15、mit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels CEN 1989 Copyright reserved to all CEN members Ref. No. EN 2497:1989 EEN2497:1989 BSI 09-1999 2 Brief history This draft European Standard has been prepared by the European Associatio
16、n of Aerospace Manufacturers (AECMA). After enquiries and votes carried out in accordance with the rules of this Association, this draft has successively received the approval of the National Associations and the Official Services of the member countries of AECMA, prior to its presentation to CEN. I
17、n accordance with the Common CEN/CENELEC Rules, the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxemburg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. Conten
18、ts Page Brief history 2 1 Scope and field of application 3 2 Process schedule 3 3 Inspection and testing 3EN2497:1989 BSI 09-1999 3 1 Scope and field of application This standard specifies the process schedule and requirements for dry abrasive blasting of titanium and titanium alloys used in aerospa
19、ce constructions. The method specified is applicable to the pretreatment of titanium and titanium alloys and to qualification tests of adhesives on these materials. 2 Process schedule 2.1 General remark Air used for drying, blasting or other process operations shall be dry and free from oil. During
20、and after blasting specimens 1)and parts shall only be handled with dry clean gloves. 2.2 Precleaning The specimens and parts shall be emulsion cleaned, or alkaline cleaned with subsequent rinsing and drying, or non-halogenated solvent cleaned (do not use methyl alcohol). 2.3 Dry blasting Immediatel
21、y after cleaning specimens and parts shall be blasted (as long as necessary) to produce a uniform matt surface finish. 2.3.1 Abrasives Aluminium oxide (Al 2 O 3 ) grit shall have a purity of at least99,3% with less than0,25% FeO. Grit size: 40 to 50 4m. Abrasives used for dry blasting shall be free
22、from contaminants such as grease, oil and silicones and shall not be used for any material except titanium and its alloys. 2.3.2 Blasting parameters Blasting pressure: 140 kPa Nozzle to work distance: 200 to 250 mm Blasting angle: 45 nominal. 2.3.3 Apparatus CAUTION: The dry abrasive blaster shall h
23、ave provisions to prevent fire hazards. 2.4 Post cleaning Cleaning after blasting consists of compressed air blasting followed by non-halogenated solvent cleaning. NOTEAdhesives or bonding primers shall be applied within one hour after abrasive blasting and its post cleaning. 3 Inspection and testin
24、g Specimens and parts processed according to this standard shall meet the following requirements: 3.1 Surfaces shall have a uniform matt finish and shall be free of scale, blasting debris, discolouration, grease-like materials, fingerprints or other contaminants. 3.2 After immersion in pure water ha
25、ving a resistivity of not less than507 m for some seconds and after removal from the water, the surfaces shall show no water breaks. If these occur, cleaning shall be repeated. 3.3 Specimens and parts shall not be distorted. 3.4 Abrasives used for blasting shall be regularly inspected to ensure that
26、 it complies with the requirements of clause2.3.1. 1) Dimensions of specimens depend upon the parts and qualification testing of adhesives4 blankBSEN2497:1990 BSI 09-1999 National appendix A The United Kingdom participation in the preparation of this European Standard was entrusted by the Aerospace
27、Standards Policy Committee (ACE/-) to Technical Committee ACE/44 upon which the following bodies were represented: Metal Finishing Association Oil and Colour Chemists Association Paintmakers Association of Great Britain Ministry of Defence Society of British Aerospace Companies Ltd.BS EN 2497:1990 B
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