1、CEN EN*Z477 83 3404587 0002370 3 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 Aerospace series Dry abrasive blasting of titanium
2、and titanium alloys Srie arospatiale Sablage sec du titane et des alliages de titane Luft- und Raumfahrt Trockenstrahlen von Titan und Titanlegierungen This European Standard was accepted by CEN on 1988-03-1 7. CEN members are bound to comply with the requirements of CEN Internal Regulations which s
3、tipulate the conditionsfor giving this European Standardthe 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 Central Secretariat orto any CEN member. This European Standa
4、rd exists in three off ical versions (English, French, German). Aversion 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 the official .versions. CEN members are the national standa
5、rds organizations of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxemburg, Netherlands, Noway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung
6、Central Secretariat : Rue Brderode 2, B-1 O00 Bruxelles CEN 1989 Copyright reserved to all CEN members Ref. Nr EN 2497 : 1989 E CEN EN*2497 89 = 3404587 0002371 5 t EN 2497 Page 2 Brief Histary This draft European Stanard has been 2reyared 3y the European of Aerospace Manufacturers (AECXA). Associat
7、ion Af:sr enquiries and votes carrisd out in accordance with tha rules of this Assziation , this drift has successi-:el? recel-:ed tne approval of :hs Iiational Associations ani the Official Ssr-rices of the semSer csuntrles sf .izL.i, 9r:cr :a ifs ?recantatrcn to CS3. . -irr.!. In zcnir5arice w:th
8、the Cormon CZ!I/CZ:IZLX 3uiss, the falIowir,g c311cr12s ar2 jound to :nple!nent this European StanCari: .:*:stria, 3eig;u.?i, Dennark, Piniand, Trance, Gor2any, Greece, Icslari, Zrrland, Italy, Luxem3urg, Netherlands, Norway, Portugal, Spain, Sweier, Switzer:and and Unirad Kingdom. t CEN EN*2497 89
9、340q589 0002372 7 EN 2497 Page 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 aerospace constructions. The method specified is applicable to the pretreatment of titanium and titanium a
10、lloys and to qualification tests of adhesives on these materials. 2 Process schedule 2,l General remark Air used for drying, blasting or other process operations shall be dry and free from oil. During and after blasting specimens ) and parts shall only be handled with dry clean gloves. 2.2 Precleani
11、ng 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 Immediately after cleaning specimens and parts shall be blasted (as long as necessary) to produce a uniform m
12、att surface finish. 2.3.1 Abrasives Aluminium oxide (A1203) grit shall have a purity of at least 99,32 with less than 0,252 Feo. Grit size : 40 to 50 um. Abrasives used for dry blasting shall be free from contaminants such as grease, oil and silicones and shall not be used for any material except ti
13、tanium and its alloys. 2.3.2 Blasting parameters - Blasting pressure : 140 kPa - Nozzle to work distance : 200 to 250 PIIP - Blasting angle : 45“ nominal. 1) adhe cive s Dimensions of specimens depend upon the parts and qualification testing of CEN EN*2497 89 m 3409589 0002373 9 m T EN 2497 Page 4 2
14、3.3 Apparat us Caution : The dry abrasive blaster shall have provisions to prevent fire hazards. 2.4 Post cleaning Cleaning after blasting consists of compressed air blasting followed by non-halogenated solvent cleaning. NOTE - Adhesives or bonding primers shall be applied within one hour after abr
15、asive blasting and its post cleaning. 3 inspection and testing 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, fingerprin
16、ts or other contaminants. 3.2 After immersion in pure water having a resistivity of not less than 50 rn for some seconds 2nd after removal from the water, the surfaces shall show no water breaks. If these occur, cleaning shall be repeated. 3.3 3.4 complies with the requirements of clause 2.3.1. Specimens and parts shall not be distorted. Abrasives used for blasting shall be regularly inspected to ensure that it
