1、BRITISH STANDARD AEROSPACE SERIES BSEN 3212:1995 Paints and varnishes Corrosion test by alternate immersion in a buffered sodium chloride solution The European Standard EN3212:1995 has the status of a BritishStandard ICS49.040.10 UDC667.61:620.193:629.7BSEN3212:1995 This BritishStandard, having been
2、 prepared under the directionof the Engineering SectorBoard, was published underthe authority of the Standards Board and comesintoeffect on 15December1995 BSI01-2000 The following BSI references relate to the work on this standard: Committee referenceACE/44 Draft for comment89/80387DC ISBN 0 580 237
3、04 4 Committees responsible for this British Standard The preparation of this BritishStandard was entrusted to Technical Committee ACE/44, upon which the following bodies were represented: Aluminium Finishing Association British Coatings Federation Ltd. Metal Finishing Association Ministry of Defenc
4、e National Centre of Tribology Oil and Colour Chemists Association Society of British Aerospace Companies Limited Amendments issued since publication Amd. No. Date CommentsBSEN3212:1995 BSI 01-2000 i Contents Page Committees responsible Inside front cover National foreword ii Foreword 2 1 Scope 3 2
5、Normative references 3 3 Principle 3 4 Apparatus 3 5 Test solution 3 6 Test pieces 3 7 Procedure 3 8 Test report 4 9 Designation 4 Annex A (normative) Position of cuts 5 Annex B (normative) Shape of cuts 6 National annex NA (informative) Committees responsible Inside back cover National annex NB (in
6、formative) Cross-references Inside back coverBSEN3212:1995 ii BSI 01-2000 National foreword This BritishStandard has been prepared by Technical CommitteeACE/44 and is the English language version of EN3212:1995 Aerospace series Paints and varnishes Corrosion test by alternate immersion in a buffered
7、 sodium chloride solution, published by the European Committee for Standardization (CEN). EN3212 was produced as a result of international discussion in which the UnitedKingdom took an active part. A British Standard does not purport to include all the necessary provisions of a contract. Users of Br
8、itish Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Cross-references Publication referred to Corresponding British Standard ISO4628-1:1982 BS3900 Methods of test for paint. Group H Evaluation of
9、paint and varnish defects Part H1:1993 Designation of intensity, quantity and size of common types of defect: general principles and rating schemes EN2633:1993 BSEN2633:1994 Aluminium alloyAL-P2024-T3511 Extruded bars and sections1,2mmk a or Dk 150mm with peripheral coarse grain control Summary of p
10、ages This document comprises a front cover, an inside front cover, pagesi andii, theEN title page, pages2 to6, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the ins
11、ide front cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN3212 September1995 ICS49.040.10 Descriptors: Aircraft industry, paints, varnishes, corrosion tests, immersion tests, soluble matter, sodium chloride English version Aerospace series Paints and varnishes Corrosion test by alternate i
12、mmersion in a buffered sodiumchloride solution Srie arospatiale Peintures et vernis Essais de corrosion par immersions-mersions alternes dans une solution tamponne de chlorure de sodium Luft- und Raumfahrt Anstrichstoffe Bestimmung der Korrosionsbestndigkeit durch Wechseltauchversuch in einer gepuff
13、erten Natriumchloridlsung This EuropeanStandard was approved by CEN on1995-09-19. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and b
14、ibliographical references concerning such nationalstandards may be obtained on application to the Central Secretariat or to any CEN member. This EuropeanStandard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility
15、of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal
16、, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1995 Copyright reserved to CEN members Ref.No.EN3212:1995EEN3212:1995 BSI 01-2000 2 Forew
17、ord This EuropeanStandard 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 successively received the approval of the National Associations and the Official Servi
18、ces of the member countries of AECMA, prior to its presentation to CEN. This EuropeanStandard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by March1996, and conflicting national standards shall be withdrawn at the lates
19、t by March1996. According to the Common CEN/CENELEC Internal Regulations, the following countries are bound to implement this EuropeanStandard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland,
20、 United Kingdom.EN3212:1995 BSI 01-2000 3 1 Scope This standard specifies methods for corrosion test on paints and varnishes by alternate immersion in a buffered sodium chloride solution. 2 Normatives references This EuropeanStandard incorporates by dated or undated reference provisions from other p
21、ublications. 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 EuropeanStandard only when incorporated in it by amendment or revi
22、sion. For undated references the latest edition of the publication referred to applies. ISO4628-1, Paints and varnishes Evaluation of degradation of paint coatings Designation of intensity, quantity and size of common types of defect Part1: General principles and rating schemes. EN2633, Aerospace se
23、ries Aluminium alloy AL-P2024- T3511 Extruded bars and sections1,2k a or Dk 150mm with peripheral coarse grain control. 3 Principle Immerse then emerge a test piece in a test solution. 4 Apparatus An environmental chamber equipped with glass or plastic tanks containing the test solution and an appro
24、priate device to carry out the test automatically and continuously. This chamber shall be maintained at a temperature of(35 2) C and at a relative humidityU 80%. 5 Test solution The pH of the solution shall be adjusted to(8 0,1) by adding a solution of100g/l of sodium carbonate in the distilled or d
25、eionized water. 6 Test pieces Unless otherwise specified, test pieces shall be sensitized to intergranular corrosion by holding them for1h at(495 2) C in an oven followed by quenching in boiling water. The coating is specified in the standards for paints and varnishes. 7 Procedure Make cuts in the t
26、est pieces in accordance with Annex A and/or Annex B. Attach the test piece to the test device by means of insulating material. Immerse the test piece so that it is surrounded by at least10mm of the test solution. If there are several test pieces in a chamber, the distance between the test pieces sh
27、all be at least10mm. The volume of the solution shall be4ml/cm 2of the test pieces surface. A cycle comprises2h of immersion and2h of emersion. The level of the test solution shall be maintained constant by adding distilled or deionized water. The test solution shall be renewed twice during the firs
28、t week, then every ten days. Visually examine the test pieces at regular intervals and at the end of the test and record any appearance of blisters or corrosion. Sodium chloride (NaCl) : 30g/l Disodium phosphate (Na 2 HPO 4 ) : 0,19g/l Boric acid (H 3 BO 3 ) : 1,25g/l Distilled or deionized water Ma
29、terial : EN2633 Minimum dimensions in millimetres : 100 40 0,8 to2EN3212:1995 4 BSI 01-2000 On completion of the test, the test piece shall be: rinsed in distilled or denionized water; dried with absorbent paper or a cloth; examined visually so as to assess the degree of blistering in accordance wit
30、h ISO4628-1. Measure the extent of any corrosion on both sides of the cut. Perform any test required by the standards for paints or varnishes. 8 Test report It shall include the following: designation of the test; identification of the paint or varnish; preparation of surface and application and dry
31、ing conditions of the paint or varnish; coating thickness; test period; date of test; deviations from this standard. 9 Designation EXAMPLE: EN3212:1995 BSI 01-2000 5 Annex A (normative) Position of cutsEN3212:1995 6 BSI 01-2000 Annex B (normative) Shape of cuts The cut edges shall be clean. Shape A
32、Shape BBSEN3212:1995 BSI 01-2000 National annex NA (informative) Committees responsible The United Kingdom participation in the preparation of this EuropeanStandard was entrusted by the Engineering Sector Board to Technical Committee ACE/44 upon which the following bodies were represented: Aluminium
33、 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 Limited National annex NB (informative) Cross-references Publication referred to Correspondi
34、ng British Standard ISO4628-1:1982 BS3900 Evaluation of paint and varnish defects Part H1:1993 Designation of intensity, quantity and size of common types of defect: general principles and rating schemes EN2633:1993 BSEN2633:1994 Aluminium alloyAL-P2024-T3511 Extruded bars and sections1,2mmk a or Dk
35、 150mm with peripheral coarse grain controlBSEN 3212:1995 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents the UK view on standards in Europe and at the international level. It is inco
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