1、 STD-BSI BS EN 25Lb-ENGL 1797 6 Lb24bb7 Ob22905 BLb W BRITISH STANDARD AEROSPACE SERIES Passivation of corrosion resisting steels and decontamination of nickel base alloys The European Standard EN 2516 : 1997 has the status of a British standard ICs 49.040 BS EN 2516 : 1997 - STD-BSI BS EN 25Lb-ENGL
2、 1917 lib24hb7 Ub229Ub 752 m Amd. No. BS EN 2516 : 1997 Date Text affected Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee ACE/44, Protective reaments and finishes for aerospace purposes, upon which the following bodies w
3、ere represented: Numinium Finishing Association British Coatings Federation Ltd. Metal Finishing Association vhistq of Defence National Centre of n-ibology Oil and Colour Chemists Association Society of British Aerospace Companies This British Standard, having been prepared under the direction of th
4、e Engineerllig Sector Board, was published under the authority of the Standards Board and comes into effect on 15 July 1997 O BSI 1997 I I The following BSI references relate to the work on this standard Committee reference ACW44 Draft for comment 90/7574 DC ISBN O 680 26696 6 STD*BSI BS EN 25Lb-ENG
5、L 1777 Lb2Libb7 0b22707 b97 W BS EN 2616 : 1997 Contents page Committees responsible inside front cover National foreword ii Foreword 2 Specification i Scope 3 2 Purposeofprocess 3 3 Normative references 4 Ciassifidon 5 Information for the processor 3 3 4 6 Condition of the parts prior to processing
6、 4 7 Pre-lnaments 8 Tteatment 4 6 9 Required characteristics and inspection 6 10 Qualilyassurance 11 12 Desienation Health, safety and environmental aspects 7 7 7 * * rn O BSI 1997 i National foreword This British Standard has been prepared by Technid Committee ACW44 and is the English language vers
7、ion of EN 2516 : 1997 Aerospace seria - Passivation of corrosion resisting stees and decontumination of niclcel base alloys, published by the European Committee for Standardization (CEN). EN 2516 : 1997 was produced as a result of international discussions in which the United Kingdom took an active
8、part. Cross-references The British Standars corresponding to the European Standards referred to in the text are identical in number and titie with those given in clause 3. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document com
9、prises a front cover, an inside Wnt cover, pages i and ii, the EN title page, pages 2 to 8, an inside back cover and a back cover. ii Q BSI 1997 EUROPEAN STANDARD NORME EUROPEENNE EUROPISCHE NORM EN 2516 March 1997 ICs 49.040.40 Descriptors: aircraft industry, steels, corrosion resisting steels, con
10、tamination, nickel alloys, classifications, degreasing, characteristics, inspection, quality assurance, designation English version Aerospace series - Passivation of corrosion resisting steels and decontamination of nickel base alloys Srie arospatiale - Passivation des aciers rsistant la corrosion e
11、t dcontanination des alliages base nickel Luft- und Raunfahrt - Passivieren von korrosionbestndigen Sthlen und Dekontaminierung von Nickellegierungen This European Standard was approved by CEN on 1996-10-27. CEN iamkrs are boud to canply uith the CEN/CENELEC Internal Regulations which stipulate the
12、conditions for giving this European Standard the status of a national standerd without any alteration. Up-to-date listo and bibliographicat references concerning such MtiOnal standards may be obtained on application to the Central Secretariat or to any CEN member. lhe European Standards exist in thr
13、ee official versions (English, French, German). A version in any other language me by translation under the responsibility of a CEW meaber into its oun language end notified to the Central Secretariat has the same status as the official versions. CEM members are the national standards bodies of Aust
14、ria, Belgiun, Derrnark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxenbourg, Netherlands, Norway, Portugel, Spain, Sweden, Switzerland and United Kingdom. CEN European Cunnittee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: r
15、ue de Startart,% 8-1050 Brussels 0 1997 Copyright reserved to CEN meinbers Ref. No. EN 2516:1997 E Page 2 EN 2516:1997 Foreword This European Standard has been prepared by the European Association of Aerospace Manufacturers (AECMA) . After inquiries and votes carried out in accordance with the rules
16、 of this Association, this Standard has received the approval of the National Associations and the Official Services of the member countries of AECMA, prior to its presentation to CEN. This European Standard shall be given the status of a national standard, either by publication of an identical text
17、 or by endorsement, at the latest by September 1997, and conflicting national standards shall be withdrawn at the latest by September 1 997. According to the CENKENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard
18、: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. STD-BSI BS EN 251b-ENGL 1997 lbZVbb9 Ob2291L OLT W Page 3 EN 2516:1997 i scope This standard specifies several chemica
19、l methods of passivation 1) for corrosion resisting steels (austenitic, ferritic, martensitic and precipitation hardenable) and of decontamination for nickel base alloys. 2 Purpose of process To improve the corrosion resistant characteristics of a part after such treatments as machining, foming, tum
20、bling and shot peening by removing foreign metal contamination due to these operations Passivation shall not be use on castings, welded or brazed parts, carburized or nitrided surfaces nor on parts with mating surfaces when entrapment of acids may occur. 3 Normative references This European Standard
21、 incorporates by dated or undated reference provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this
22、 European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. IS0 9227 Corrosion tests in artificial atmospheres - Salt spray tests EN 2000 Aerospace series - Quality assurance - EN aerospace products - App
23、roval of the quality system of manufacturers EN 2032-1 Aerospace series - Metallic materials - Part 1 : Designation 2) 4 Classification The process class to be used depending on the material type is given in table 1, unless otherwise specified between the manufacturer and the purchaser. The designat
24、ion of the material type is defined in EN 2032-1. 1) Other processes (e.g. electrolytic polishing) can also produce passivated surfaces. 2) Published as AECMA Prestandard at the date of publication of this standard STD*BSI BS EN 251b-ENGL 1777 W LbZIbb7 Ob22712 T5b W Material type and designation Au
25、stenitic chromium-nickel steels and austenitic-ferritic steels Page 4 1 EN 2516:1997 Process dass Ci or c2 Table 1 FE-PAS%, F-PA39XX, FE-PA45XX, FE-PA47XX, FE-PA48%, FE-PA49XX. FE-PA1 5XX Fetritic and martensitic chromium steels FE-PM1 5XX, FE-PM1 7XX, FE-PMl9XX Austenitic precipitation hardenable s
26、teels Cl FE-PMWX, FE-PA29XX, FE-PA25XX i Martensitic precipitation hardenable steels 1 FE-PMZIXX, FE-PM38XX, FE-PM35XX High chromium martensitic steels i FE-PM39XX Heat resisting nickel base alloys c4 c4 c3 Cl or c2 NI-PH1 3XX, NI-PH18%, NI-PH23XX. NI-PH29XX, NI-P073XX, NI-PH26XX 5 Information for t
27、he processor - Designation, see 12 ; - reference of the material standard and metallurgical condition of the latter : - sequence of operations, if necessary : - areas to be processed. 6 Fabrication of the parts shall have been completed. Condition of the parts prior to processing 7 Pre-trsaments The
28、 parts shall be submitted to one or more of the processes (7.1 to 7.4) appropriate to their degree of contamination. These processes are given for guidance. Other methods giving at least equivalent results may be applied. Unless otherwise specified, parts shall be processed from one step to the next
29、 wthout delay. 7.1 Degreasing 7.1.1 Organic solvents Approved products shall be used either cold in liquid state or hot in vapour state. STD.BSI BS EN 251b-ENGL 1777 Lb24bb9 Ob22913 99s D Page 5 EN 2516:1997 7.1 -2 Alkaline solutions a) Degreasing in strong alkaline solutions The composition may be
30、as follows : - sodium hydroxide (NaOH) - sodium metasilicate pentahydrate (Na2Si03, 5H20) 15 sn 40 gil b) Degreasing in mild alkaline solutions The composition may be as follows : - sodium metasilicate pentahydrate : 25 gA - sodium carbonate (Na2COd : 25gn Addition of a wetting agent is possible. Th
31、ese solutions shall be used for immersion degreasing either anodically or not. 7.2 Abrasive cleaning a) Blasting - Use a fine-grain alumina or glass beads with or without water. b) Tumbling II - - II * alloys. The abrasives shall not have been used on any other type of material (see table 1) except
32、titanium base 7.3 Descaling The method shall be chosen according to the type of parts, heat treatment or hot forming. 7.4 Acid-pickling rJ2 * It shall only be used on steels not susceptible to pitting or sensitive to intergranular corrosion by the pickling solution which is most frequently an aqueou
33、s solution of nitric and hydrofluoric acids. The concentration can be adjusted within very wide limits by varying the proportions of the ingredients and by adjusting operating temperatures. Parts in steel of Rm (max.) 1 100 MPa 3) shall be de-embrittled by heat treatment at 190 OC to 230 “C for at l
34、east 1 h. 3) Rm (max.) maximum specified Rm Page 6 EN 2516:1997 8 Treatment The aqueous solutions shall be chosen from table 2 in accordance with the process class defined in table 1 for the material used to manufacture the parts. The pads shall be completely immersed in the chosen solution, then ri
35、nsed in dean water and dried. Table 2 Solution components ITemperatureI Time I Anodicvottaae 1 -1 V 9 Required characteristics and inspection 9.1 Parts 9.1 .i Appearance When subjected to visual inspection, the surfaces shall be clean and free from corrosion, pitting or other form of surface attack
36、due to the treatment. A slight discolouration is allowed. 9.1.2 Absence of iron contamination Surfaces of type parts or test specimens shall not show any iron contamination indicated by rust afler a salt spray test according to IS0 9227 for 2 h. 9.2 PfOCeSS 9.2.1 9.2.2 content less than 0.1 g/l. Air
37、 used for drying or any other operation shall be dry and free from oil. The iron content in the solutions indicated in table 2 shall be less than 5 gil and the chloride The nitric acid and sodium dichromate concentration shall be within the limits indicated in table 2. Chemical analyses of the solut
38、ions indicated in table 2 shall be canied out at regular intervals to determine the contents of nitric acid, sodium dichromate, chloride and iron. Page 7 EN 2516:1997 10 Quality assurance 10.1 Approval of the processor See EN 2000. 10.2 Process qualification Before beginning production, the processo
39、r shall submit a series of type parts and test pieces from the first batch treated under series conditions, which shall be tested according to 9.1. If the process is different from that described in this standard, it shall be qualified as follows : - at least one specimen of each material type to wh
40、ich the process is applicable (see table i), with a surface roughness of Ra s 1.6 um, shall be treated according to the process to be qualified; - after visual inspedion to 9.1.1 each specimen shall be subjected to a salt spray test in accordance with IS0 9227 for 24 h. The exposed surface shall the
41、n show not more than a few isolated spots of rust. 10.3 Acceptance The parts shall have the required charaderistics (see 9.1). Frequency of inspection shall be agreed between the purchaser and processor. 10.4 Fault sandion The parts not meeting the requirements shall be rejected. After agreement of
42、the purchaser, these parts may be reprocessed (see 7 and 8). 11 The locally applicable regulations and laws shall be observed. Health, safety and environmental aspects 12 Designation EXAMPLE : Process class (see table 1) Number of this standard NOTE : If the classes of this standard are not used (se
43、e 4), the designation shall be limited to EN 2516. - STD-BSI BS EN 251b-ENGL 1797 m lb24bb7 Ob229Lb bTL m BS EN 2516 : 1997 List of references See national foreword. O BSI 1997 BS EN 2516 : 1997 BSI 389 Chiswick Hi Fax: 0181 996 7400. BSI offers members an individual updating service called PLUS whi
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