1、STDOBSI BS EN 3bb5-ENGL L777 W Lb24bb9 Ob384Lb 437 BRITISH STANDARD AEROSPACE SERIES - Test methods for paints and varnishes - Filiform corrosion resistance test on aluminium alloys The European Standard EN 3665 : 1997 has the status of a British Standard ICs 49.040 NO COPYING WITHOUT BSI PERMISSION
2、 EXCEPT AS PERMITTED BY COPYRIGHT LAW BS EN 3665 : 1997 BS EN 3665 : 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 October 1997 O BSI 1997 National foreword Th
3、is British Standard is the English language version of EN 3665 : 1997. The UK participation in its preparation was entrusted to Technical Committee ACW4-4, Protective treatments and nishes for aerospace purposes, which has the responsibility to: - aid enquirers to understand the text; - present to t
4、he responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed - monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this committee can be obtained on request
5、 to its secrem. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitied International Standards Correspondence Index, or by using the Find facility of the BSI Smd
6、ards Electronic Catalogue. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a nont cover, an inside front cover, the EN titie page, pages 2 to 8, an inside back cover and a back cover. Amendments issued since publi
7、cation (Date I Text affected The following BSI references relate to the work on this standard Committee reference ACE44 Draft for cornent 89R7370 DC ISBN O 680 28129 9 STD-BSI BS EN 3bbS-ENGL 1777 m lb24bb Ob3841B 201 m EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 3665 Jun 1997 ICs 49.060 De
8、scriptors: aircraft industry, aluminium allow, paints, varnishes, filiform corrosion tests, corrosion tests, corrosion resistance English version Aerospace series - Test methods for paints and varnishes - Filiform corrosion resistance test on aluminium alloys Srie arospatiale - Mthodes dcssai pour p
9、eintures et vernis - Essai de rsistance la corrosion filiforme sur alliage daluniniun Luft- und Ramfrhrt - Prfverfahren fr Anstrichstoffe - Prf- der Bestndigkeit gegen Filifornkorrosion von Alminiunlegiervigen Thin European Standard was approved by CEM on 1996-08-04. CEN nrnkrs are bound to caply wi
10、th the CEN/CENELEC Intern81 Regulations which stipulate the conditions for giving this European Standard the status of a notional standard without any alteration. Up-to-date lists and bibliographicat references concerning such nationel standards my be obtained on application to the Central Secretari
11、at or to any CEN nmiber. The European Standards exist in three official versions (English, French, German). A version in any other language made by translation udcr the responsibility of a CEN member into its own language and notified to the Central Secretariat has the seune status as the official v
12、ersions. CEM n#mbers are the national standards bodies of Austria, Belgiun, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxemburg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Cmnittee for Standardization Comit Eur
13、opCen de Normalisation Europisches Komitee fr Nornung Central Secretariat: rue de Stassart.36 B-1050 Brussels 0 1997 CEN - All rights of expuitation in any form and by any means reserved worldwide for CEN national nembers. Ref. No. EN 35:1997 E STD-BSI BS EN 3bbS-ENGL 1997 lb24bb9 Ob384L 148 = Page
14、2 EN 3665:1997 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 of this Association, this Standard has received the approval of the National Associations and the Offic
15、ial 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 or by endorsement, at the latest by December 1997, and conflicting national standards shall be withdraw
16、n at the latest by December 1997. According to the CENKENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Lux
17、embourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. .- . - , ._,. * 2 Page 3 EN 3665 : 1997 1 Scope This standard specifies a test method for the determination of the protective action of coatings of paints or varnishes against filiform corrosion on aluminium a
18、lloys. 2 Normative references This European Standard 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
19、revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. EN 2090 Aerospace series - Aluminium alloy 2024-T3 - Clad sheet and strip - 0,4 s a I 6 mm 1
20、) EN 2334 Aerospace series - Acid chromate pickling of aluminium and aluminium alloys 1) 3 Definition For the purposes of this standard, the following definition applies: Filiform corrosion : a type of corrosion that occurs under coatings on metal substrates. It starts from unprotected edges or loca
21、l damage through the coating. 4 Principle Coated metal test pieces are : - scribed ; - placed in a corrosive atmosphere to initiate corrosion ; - exposed to controlled temperature and humidity conditions conducive to filiform corrosion. 5 Apparatus and reagents - Tools for scribing grooves - Contain
22、er with cover, resistant to hydrochloric acid - Test cabinet capable of being maintained at the required temperature and relative humidity - Hydrochloric acid, analytical grade, p = 1 ,l8 g/cm3 6 Preparation of test pieces 6.1 General Unless otherwise specified, test pieces shall be in conformitv wi
23、th figure 1. I) Published as AECMA Standard at the date of publication of this standard _ - “7 . - Page 4 EN 3665 : 1997 Test pieces shall be treated and coated as indicated in the paint and varnish standard. If the latter does not specify any pretreatment or undercoat of paint, test pieces shall be
24、 acid chromate pickled in accordance with EN 2334 and coated with a paint primer within 4 h and subsequently with a finishing paint. After curing of the coating, grooves shall be scribed to 6.2. 6.2 Grooves Two grooves shall be made, see figures 1 and 2 or 3. The paint film at the groove edges shall
25、 be smooth. Dimension in millimetres Material : EN 2090 Thickness : 0.8 mm to 2 mm h 40 -+ Rolling direction 40 I Figure 1 . _. . . . - . ,. . . STD.BSI BS EN 3bbS-ENGL 1997 Lb24bbS Ob38422 732 Page 5 EN 3665 : 1997 6.2.1 Method A See figure 2. Dimensions in millimetres Figure 2 6.2.2 Method B See f
26、igure 3. - I * * ul Dimensions in millimetres Substrate Figure 3 Page 6 EN 3665 : 1997 7 Test procedure The container shall have (20 i 2) ml of hydrochloric acid per litre of volume. Place the test pieces in the container horizontally with the paint film downwards. The distance between test pieces a
27、nd liquid level shall be (100 i 10) mm. The distance between test pieces shall be 20 mm minimum. The container shall remain closed for (60 f 5) min at a temperature of (23 f 2) OC. After removal from the container the test pieces shall stand in open air for 15 min minimum and 30 min maximum. Place t
28、he test pieces in a test cabinet at a temperature of (40 f 2) OC and (82 i 3) % relative humidity for the period time stated in the paint or varnish standard in an approximately vertical position. If specified, the coating shall be removed with a non corrosive paint remover within 6 h after removal,
29、 at least in the deterioration area. Then, the test pieces shall be flushed with warm water and then again with alcohol. The test pieces shall be placed in a desiccator above a drying agent, until evaluation. 8 Evaluation It shall be carried out using methods 1, 2 or 3 on the groove with the highest
30、 degree of corrosion. 8.1 Method 1 This applies where there is regular corrosion, see figure 5. It includes : - measuring ML and MR, see figure 4, in order to calculate the maximum length M which is the mean value of ML and MR ; - measuring mL and mR, see figure 6, in order to calculate the majority
31、 length m which is the mean value of mL and mR . 8.2 Method 2 This applies where there is irregular corrosion. It includes : - determining M, see method 1 ; - measuring mL1, mL2, etc., in order to calculate the overall values mL and mR using the following formulae : where : mLlr mR1, xl, yl, etc. an
32、d 2 are defined in figure 6. 8.3 Method 3 This applies in the case of regular and irregular corrosion. The degree of filiform corrosion is obtained by visually comparing the test piece with a series of standard photographs. STD*BSI BS EN 3bb5-ENGL 1777 Lb24bb7 0b3842q 505 D Page 7 EN 3665 : 1997 mb
33、, mRC , I- Figure 4 Figure 5 Figure 6 Page 8 EN 3665 : 1997 9 Test report It shall include the following : - the designation, see 10 ; - the material and pretreatment of test piece ; - the identification of the paint or varnish batch, the application conditions ; - the drying conditions ; - the coat
34、ing thickness ; - the degree of filiform corrosion ; - any deviation from this standard ; - the date of test. 1 O Designation EXAMPLE : Method of scribing grooves (see 6.2) Number of this standard Evaluation method (see 8) STD-BSI BS EN 3bbS-ENGh 1777 Lb24bbS Ob3842b 388 M BS EN 3665 : 1997 BSI 389
35、Chiswick High Road London w4 4AL 3SI - British Standards Institution IS1 is the independent national body responsible for preparing British standards. It Iresents the UK view on standards in Europe and at the international level. It is icorporated by Royal Charter. :ontract requirements L British St
36、andard does not purport to include ail the necessary provisions of a ontract. Users of British Standardc are responsible for their correct application. Cevisions 5ritish Standards are updated by amendment or revision. Users of British Standards houid make sure that they possess the latest amendments
37、 or editions. t is the constant aim of BSI to improve the quality of our products and services. We vould be grateful if anyone finding an inaccuracy or ambiguity while using this 3ritish Standard would inform the Secretary of the responsible technical committee, he identity of which can be found on
38、the Mide front cover. Tel 0181 996 9000; Fax: I181 996 7400. EI offers members an individual updating service called PLUS which ensures that 8ubscribers automatically receive the latest editions of standards. hying standards Irders for ail BSI, international and foreign standards publications should
39、 be uldressed to Customer Services, Sales Department at Chiswick Tel 0181 996 7000; Fax: 0181 996 7001. n response to orders for international standards, it is BSI policy to supply the BSI mplementation of those that have been published as British Standards, unless )theruTise requested. .dormation o
40、n standards 3SI provides a wide range of information on national, European and international ;tandards through its Library, the Standarline Database, the BSI Information kchnology Service (BITS) and its Technical Help to Exporters Service. Contact the nformation Department at Chiswick Tel 0181 996 7
41、111; Fax: 0181 996 7048. Subscribing members of BSI are kept up to date with standards developments and *eceive substantial discounts on the purchase price of standards. For details of hese and other benefits contact Customer Services, Membership at Chiswick re1 0181 996 7002; Fax: 0181 996 7001. Zo
42、pyright 2opyright subsists in all BSI publications. BSI also holds the copyright, in the UK, of he publications of the international standardization bodies. Except as permitted mder the Copyright, Designs and Patents Act 1988 no exlxact may be reproduced, stored in a retrieval system or transmitted
43、in any form or by any means - electronic, 2hotocopying, recording or otherwise - without prior written permission from BSI. Rs does not preclude the free use, in the course of implementing the standard, of necessary details such as symbols, and size, type or grade designations. If these details are
44、to be used for any other purpose than implementation then the prior written permission of BSI must be obtained. permission is granted, the terms may include royalty payments or a licensing agreement. Details and advice can be obtained from the Copyright Manager, BSI, 389 Chiswick High Road, London W4 4AL.
