1、BRITISH STANDARD AEROSPACE SERIES BS EN 3665:1997 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 49.040BSEN3665:1997 This British Standard, having been prepared under the directi
2、onof the Engineering SectorBoard, was published underthe authority of the Standards Board and comes into effect on 15October1997 BSI 09-1999 The following BSI references relate to the work on this standard: Committee reference ACE/44 Draft for comment 89/77370DC ISBN 0 580 28129 9 National foreword
3、This British Standard is the English language version of EN3665:1997. The UK participation in its preparation was entrusted to Technical Committee ACE/44, Protective treatments and finishes for aerospace purposes, which has the responsibility to: aid enquirers to understand the text; present to the
4、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 to
5、its secretary. 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 entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI
6、Standards Electronic Catalogue. 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 Standard does not of itself confer immunity from legal obligations. Summary o
7、f pages This document comprises a front cover, an inside front cover, pages i and ii, theEN title page, pages2to8 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 inside front cover. A
8、mendments issued since publication Amd. No. Date CommentsBSEN3665:1997 BSI 09-1999 i Contents Page National foreword Inside front cover Foreword 2 Text of EN3665 3ii blankEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 3665 June 1997 ICS 49.040 Descriptors: Aircraft industry, aluminium alloys,
9、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 dessai pour peintures et vernis Essai de rsistance la corrosion fi
10、liforme sur alliage daluminium Luft- und Raumfahrt Prfverfahren fr Anstrichstoffe Prfung der Bestndigkeit gegen Filiformkorrosion von Aluminiumlegierungen This European Standard was approved by CEN on1996-08-04. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulat
11、e 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 to any CEN member. The European Standards exist
12、 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. CEN members are the national standards bodie
13、s of Austria, Belgium, CzechRepublic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and UnitedKingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung
14、Central Secretariat: rue de Stassart 36, B-1050 Brussels 1997CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 3665:1997EEN3665:1997 BSI 09-1999 2 Foreword This European Standard has been prepared by the European Association of Aeros
15、pace 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 countries of AECMA, prior to its presentation to CEN. This European Standar
16、d shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by December1997, and conflicting national standards shall be withdrawn at the latest by December1997. According to the CEN/CENELEC Internal Regulations, the national standa
17、rds organizations of the following countries are bound to implement this European Standard: Austria, Belgium, CzechRepublic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the UnitedKingdom. Contents Page
18、Foreword 2 1 Scope 3 2 Normative references 3 3 Definition 3 4 Principle 3 5 Apparatus and reagents 3 6 Preparation of test pieces 3 7 Test procedure 5 8 Evaluation 6 9 Test report 8 10 Designation 8 Figure 1 4 Figure 2 5 Figure 3 5 Figure 4 7 Figure 5 7 Figure 6 7EN3665:1997 BSI 09-1999 3 1 Scope T
19、his standard specifies a test method for the determination of the protective action of coatings of paints or varnishes against filiform corrosion on aluminium alloys. 2 Normative references This European Standard incorporates by dated or undated reference provisions from other publications. These no
20、rmative 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. For undated re
21、ferences the latest edition of the publication referred to applies. EN 2090, Aerospace series Aluminium alloy 2024-T3 Clad sheet and strip 0,4 k a k 6mm 1) . EN 2334, Aerospace series Acid chromate pickling of aluminium and aluminium alloys 1) . 3 Definition For the purposes of this standard, the fo
22、llowing definition applies: filiform corrosion a type of corrosion that occurs under coatings on metal substrates. It starts from unprotected edges or local damage through the coating 4 Principle Coated metal test pieces are: scribed; placed in a corrosive atmosphere to initiate corrosion; exposed t
23、o controlled temperature and humidity conditions conducive to filiform corrosion. 5 Apparatus and reagents Tools for scribing grooves Container with cover, resistant to hydrochloric acid Test cabinet capable of being maintained at the required temperature and relative humidity Hydrochloric acid, ana
24、lytical grade, = 1,18g/cm 3 6 Preparation of test pieces 6.1 General Unless otherwise specified, test pieces shall be in conformity with Figure 1. 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 p
25、aint, test pieces shall be acid chromate pickled in accordance with EN2334and coated with a paint primer within4h and subsequently with a finishing paint. After curing of the coating, grooves shall be scribed to6.2. 6.2 Grooves Two grooves shall be made, see Figure 1 and Figure 2 or Figure 3. The pa
26、int film at the groove edges shall be smooth. 1) Published as AECMA Standard at the date of publication of this standardEN3665:1997 4 BSI 09-1999 Figure 1 EN3665:1997 BSI 09-1999 5 6.2.1 Method A See Figure 2. 6.2.2 Method B See Figure 3. 7 Test procedure The container shall have (20 2) ml of hydroc
27、hloric acid per litre of volume. Place the test pieces in the container horizontally with the paint film downwards. The distance between test pieces and liquid level shall be (100 10) mm. The distance between test pieces shall be20mm minimum. The container shall remain closed for (60 5) min at a tem
28、perature of (23 2) C. After removal from the container the test pieces shall stand in open air for15min minimum and30 min maximum. Place the test pieces in a test cabinet at a temperature of (40 2) C and (82 3) % relative humidity for the period time stated in the paint or varnish standard in an app
29、roximately vertical position. If specified, the coating shall be removed with a non corrosive paint remover within6h after removal, 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
30、above a drying agent, until evaluation. Figure 2 Figure 3 EN3665:1997 6 BSI 09-1999 8 Evaluation It shall be carried out using methods1, 2or3on the groove with the highest degree of corrosion. 8.1 Method 1 This applies where there is regular corrosion, see Figure 5. It includes: measuring M Land M R
31、 , see Figure 4, in order to calculate the maximum length M which is the mean value of M Land M R ; measuring m Land m R , see Figure 6, in order to calculate the majority length m which is the mean value of m Land m R . 8.2 Method 2 This applies where there is irregular corrosion. It includes: dete
32、rmining M, see method 1; measuring m L1 , m L2 , etc., in order to calculate the overall values m Land m Rusing the following formula: where: m L1 , m R1 , x 1 , y 1 , etc. and Z are defined in Figure 6. 8.3 Method 3 This applies in the case of regular and irregular corrosion. The degree of filiform
33、 corrosion is obtained by visually comparing the test piece with a series of standard photographs.EN3665:1997 BSI 09-1999 7 Figure 4 Figure 5 Figure 6 EN3665:1997 8 BSI 09-1999 9 Test report It shall include the following: the designation, see10; the material and pretreatment of test piece; the iden
34、tification of the paint or varnish batch, the application conditions; the drying conditions; the coating thickness; the degree of filiform corrosion; any deviation from this standard; the date of test. 10 Designation EXAMPLE:9 blankBS EN 3665:1997 BSI 389 Chiswick High Road London W4 4AL BSIBritishS
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