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1、BRITISH STANDARD AEROSPACE SERIES BS EN 2516:1997 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 Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 02 17:58:52 GMT+00:00 2006, Unc
2、ontrolled Copy, (c) BSI BS EN 2516:1997 This British Standard, having been prepared under the direction of the Engineering Sector Board, was published under the authority of the Standards Board and comes into effect on 15 July 1997 BSI 09-1999 The following BSI references relate to the work on this
3、standard: Committee reference ACE/44 Draft for comment 90/75748 DC ISBN 0 580 26696 6 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee ACE/44, Protective treatments and finishes for aerospace purposes, upon which the follo
4、wing bodies were represented: Aluminium Finishing Association British Coatings Federation Ltd. Metal Finishing Association Ministry of Defence National Centre of Tribology Oil and Colour Chemists Association Society of British Aerospace Companies Amendments issued since publication Amd. No.DateComme
5、nts Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 02 17:58:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 2516:1997 BSI 09-1999i Contents Page Committees responsibleInside front cover National forewordii Foreword2 1Scope3 2Purpose of process3 3Normative references3 4Classification3 5Infor
6、mation for the processor4 6Condition of the parts prior to processing4 7Pre-treatments4 8Treatment5 9Required characteristics and inspection5 10Quality assurance5 11Health, safety and environmental aspects6 12Designation6 Table 13 Table 25 List of referencesInside back cover Licensed Copy: sheffield
7、un sheffieldun, na, Thu Nov 02 17:58:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 2516:1997 ii BSI 09-1999 National foreword This British Standard has been prepared by Technical Committee ACE/44 and is the English language version of EN 2516:1997 Aerospace series Passivation of corrosion resi
8、sting steels and decontamination of nickel 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 part. Cross-references The British Standards corresponding to the Europ
9、ean Standards referred to in the text are identical in number and title with those given in clause 3. 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 Standar
10、d does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the EN title page, pages 2 to 6, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had ame
11、ndments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 02 17:58:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 2516 March 1997 ICS 49.040.40 Descriptors: Ai
12、rcraft industry, steels, corrosion resisting steels, contamination, 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 arospa
13、tiale Passivation des aciers rsistant la corrosion et dcontamination des alliages base nickel Luft- und Raumfahrt Passivieren von korrosionbestndigen Sthlen und Dekontaminierung von Nickellegierungen This European Standard was approved by CEN on 1996-10-27. CEN members are bound to comply with the C
14、EN/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 application to the Central Secretariat or t
15、o any CEN member. The European Standards exist 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 Central Secretariat has the same status as the official versions
16、. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation
17、 Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1997 Copyright reserved to CEN members Ref. No. EN 2516:1997 E Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 02 17:58:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 2516:1997 BSI 09-1999 2 Foreword This
18、European Standard has been prepared by the European Association of Aerospace Manufacturers (AECMA). After inquiries and votes carried out in accordance with the rules of this Association, this Standard has received the approval of the National Associations and the Official Services of the member cou
19、ntries 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 or by endorsement, at the latest by September 1997, and conflicting national standards shall be withdrawn at the latest by September
20、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, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spa
21、in, Sweden, Switzerland and the United Kingdom. Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 02 17:58:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 2516:1997 BSI 09-19993 1 Scope This standard specifies several chemical methods of passivation1) for corrosion resisting steels (austenitic, f
22、erritic, 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, forming, tumbling and shot peening by removing foreign metal contamination due to th
23、ese operations Passivation shall not be used 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 incorporates by dated or undated reference provisions from other publi
24、cations.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 European Standard only when incorporated in it by amendment or revision
25、. For undated references the latest edition of the publication referred to applies. ISO 9227, Corrosion tests in artificial atmospheres Salt spray tests. EN 2000, Aerospace series Quality assurance EN aerospace products Approval of the quality system of manufacturers. EN 2032-1, Aerospace series Met
26、allic materials Part 1: Designation2). 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 designation of the material type is defined in EN 2032-1. Table 1 1) Other processes (e.
27、g. electrolytic polishing) can also produce passivated surfaces. 2) Published as AECMA Prestandard at the date of publication of this standard Material type and designationProcess class Austenitic chromium-nickel steels and austenitic-ferritic steels FE-PA36XX, FE-PA39XX, FE-PA45XX, FE-PA47XX, FE-PA
28、48XX, FE-PA49XX, FE-PA15XX C1 or C2 Ferritic and martensitic chromium steels FE-PM15XX, FE-PM17XX, FE-PM19XX C4 Austenitic precipitation hardenable steels FE-PA26XX, FE-PA29XX, FE-PA25XX C1 Martensitic precipitation hardenable steels FE-PM27XX, FE-PM38XX, FE-PM35XX C4 High chromium martensitic steel
29、s FE-PM39XX C3 Heat resisting nickel base alloys NI-PH13XX, NI-PH18XX, NI-PH23XX, NI-PH29XX, NI-PD73XX, NI-PH26XX C1 or C2 Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 02 17:58:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 2516:1997 4 BSI 09-1999 5 Information for the processor Designation
30、, see 12; reference of the material standard and metallurgical condition of the latter; sequence of operations, if necessary; areas to be processed. 6 Condition of the parts prior to processing Fabrication of the parts shall have been completed. 7 Pre-treatments The parts shall be submitted to one o
31、r 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 without delay. 7.1 Degreasing 7.1
32、.1 Organic solvents Approved products shall be used either cold in liquid state or hot in vapour state. 7.1.2 Alkaline solutions a) Degreasing in strong alkaline solutions The composition may be as follows: b) Degreasing in mild alkaline solutions The composition may be as follows: Addition of a wet
33、ting agent is possible. These 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 The abrasives shall not have been used on any other type of material (see Table 1) exc
34、ept titanium base alloys. 7.3 Descaling The method shall be chosen according to the type of parts, heat treatment or hot forming. 7.4 Acid-pickling 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
35、aqueous 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 MPa3) shall be de-embrittled by heat treatment at 190 C to 230 C for a
36、t least 1 h. sodium hydroxide (NaOH):15 g/l sodium metasilicate pentahydrate (Na2SiO3, 5H2O):40 g/l sodium metasilicate pentahydrate:25 g/l sodium carbonate (Na2CO3):25 g/l 3) Rm (max.) = maximum specified Rm Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 02 17:58:52 GMT+00:00 2006, Uncontrolle
37、d Copy, (c) BSI EN 2516:1997 BSI 09-19995 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 parts shall be completely immersed in the chosen solution, then rinsed in clean water a
38、nd dried. Table 2 9 Required characteristics and inspection 9.1 Parts 9.1.1 Appearance When subjected to visual inspection, the surfaces shall be clean and free from corrosion, pitting or other form of surface attack due to the treatment. A slight discolouration is allowed. 9.1.2 Absence of iron con
39、tamination Surfaces of type parts or test specimens shall not show any iron contamination indicated by rust after a salt spray test according to ISO 9227 for 2 h. 9.2 Process 9.2.1 Air used for drying or any other operation shall be dry and free from oil. 9.2.2 The iron content in the solutions indi
40、cated in Table 2 shall be less than 5 g/l and the chloride content less than 0,1 g/l. The nitric acid and sodium dichromate concentration shall be within the limits indicated in Table 2. Chemical analyses of the solutions indicated in Table 2 shall be carried out at regular intervals to determine th
41、e contents of nitric acid, sodium dichromate, chloride and iron. 10 Quality assurance 10.1 Approval of the processor See EN 2000. 10.2 Process qualification Before beginning production, the processor shall submit a series of type parts and test pieces from the first batch treated under series condit
42、ions, 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 which the process is applicable (see Table 1), with a surface roughness of Ra k 1,6 4m, shall be treated ac
43、cording to the process to be qualified; after visual inspection to 9.1.1 each specimen shall be subjected to a salt spray test in accordance with ISO 9227 for 24 h. The exposed surface shall then show not more than a few isolated spots of rust. Process classSolution components g/l Temperature C Time
44、 min Anodic voltage V HNO3 b Na2Cr2O7, 2H2O c C1200 to 25020 to 30 50 to 5520 to 40 Without 20 to 3030 to 60 C2200 to 50020 to 3030 to 60Without C3a a) b) 200 to 25020 to 3050 to 552 to 33 to 5 40 to 6060 to 7030 to 40Without C4a a) b) 200 to 25020 to 3050 to 5520 to 40Without 40 to 6060 to 7030 to
45、40Without a Step a) shall be followed by step b) with a clean water rinse in between. b HNO3: Nitric acide c Na2Cr2O7, 2H2O: Hydrated sodium dichromate Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 02 17:58:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 2516:1997 6 BSI 09-1999 10.3 Acceptanc
46、e The parts shall have the required characteristics (see 9.1). Frequency of inspection shall be agreed between the purchaser and processor. 10.4 Fault sanction The parts not meeting the requirements shall be rejected. After agreement of the purchaser, these parts may be reprocessed (see 7 and 8). 11
47、 Health, safety and environmental aspects The locally applicable regulations and laws shall be observed. 12 Designation EXAMPLE: NOTEIf the classes of this standard are not used (see 4), the designation shall be limited to EN 2516. Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 02 17:58:52 GMT+
48、00:00 2006, Uncontrolled Copy, (c) BSI BS EN 2516:1997 BSI 09-1999 List of references See national foreword. Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 02 17:58:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 2516:1997 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Insti
49、tution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions British Standards are updated by amendment or revision. Users of British Standards should make sure that they possess the latest amendments or editions. It is the constant aim of BSI to improve the quality of our products and services. We would be grateful if anyone finding an inaccuracy or ambiguity