BS EN ISO 4623-2-2016 Paints and varnishes Determination of resistance to filiform corrosion Aluminium substrates《色漆和清漆 耐丝状腐蚀的测定 铝衬底》.pdf

《BS EN ISO 4623-2-2016 Paints and varnishes Determination of resistance to filiform corrosion Aluminium substrates《色漆和清漆 耐丝状腐蚀的测定 铝衬底》.pdf》由会员分享，可在线阅读，更多相关《BS EN ISO 4623-2-2016 Paints and varnishes Determination of resistance to filiform corrosion Aluminium substrates《色漆和清漆 耐丝状腐蚀的测定 铝衬底》.pdf（18页珍藏版）》请在麦多课文档分享上搜索。

1、BS EN ISO 4623-2:2016Paints and varnishes Determination of resistance tofiliform corrosionPart 2: Aluminium substrates(ISO 4623-2:2016)BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06BS EN ISO 4623-2:2016 BRITISH STANDARDNational forewordThis British Standard is the

2、UK implementation of EN ISO4623-2:2016. It supersedes BS EN ISO 4623-2:2004 which iswithdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee STI/10, Test methods for paints.A list of organizations represented on this committee can beobtained on request to its secretary.T

3、his publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2016.Published by BSI Standards Limited 2016ISBN 978 0 580 87401 7ICS 87.040Compliance with a British Standard cannot confer immu

4、nity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 August 2016.Amendments/corrigenda issued since publicationDate T e x t a f f e c t e dEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 4623-2 August 2016 ICS

5、 87.040 Supersedes EN ISO 4623-2:2004English Version Paints and varnishes - Determination of resistance to filiform corrosion - Part 2: Aluminium substrates (ISO 4623-2:2016) Peintures et vernis - Dtermination de la rsistance la corrosion filiforme - Partie 2: Subjectiles en aluminium (ISO 4623-2:20

6、16) Beschichtungsstoffe - Bestimmung der Bestndigkeit gegen Filiformkorrosion - Teil 2: Aluminium als Substrat (ISO 4623-2:2016) This European Standard was approved by CEN on 23 July 2016. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for gi

7、ving 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 CEN-CENELEC Management Centre or to any CEN member. This European Standard exists in three of

8、ficial 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 CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies

9、of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain

10、, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2016 CEN All rights of exploitation in any form and by any means reserved worldwide

11、for CEN national Members. Ref. No. EN ISO 4623-2:2016 EBS EN ISO 4623-2:2016EN ISO 4623-2:2016 (E) 3 European foreword This document (EN ISO 4623-2:2016) has been prepared by Technical Committee ISO/TC 35 “Paints and varnishes” in collaboration with Technical Committee CEN/TC 139 “Paints and varnish

12、es” the secretariat of which is held by DIN. 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 February 2017, and conflicting national standards shall be withdrawn at the latest by February 2017. At

13、tention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN ISO 4623-2:2004. According to the CEN-CENELEC Internal Regul

14、ations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, It

15、aly, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement notice The text of ISO 4623-2:2016 has been approved by CEN as EN ISO 4623-2:2016 without any modification. BS EN ISO

16、4623-2:2016ISO 4623-2:2016(E)Foreword ivIntroduction v1 Scope . 12 Normative references 13 Terms and definitions . 14 Principle 25 Sampling 26 Apparatus . 27 Reagents 28 Test panels 28.1 Material and dimensions 28.2 Preparation and coating 38.3 Drying and conditioning . 38.4 Thickness of coating . 3

17、9 Procedure. 39.1 Determination . 39.2 Scribing the test panels 39.3 Testing 59.4 Inspection of test panels . 510 Evaluation of the degree of filiform corrosion 511 Precision . 512 Test report . 5Bibliography 7 ISO 2016 All rights reserved iiiContents PageBS EN ISO 4623-2:2016ISO 4623-2:2016(E)Forew

18、ordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technic

19、al committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of el

20、ectrotechnical standardization.The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was

21、 drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such paten

22、t rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents).Any trade name used in this document is information given for the convenience of users and does not co

23、nstitute an endorsement.For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following URL: www.iso.org/i

24、so/foreword.html.The committee responsible for this document is ISO/TC 35, Paints and varnishes, Subcommittee SC 9, General test methods for paints and varnishes.This second edition cancels and replaces the first edition (ISO 4623-2:2003), which has been technically revised. It also incorporates the

25、 Technical Corrigendum ISO 4623-2:2003/Cor 1:2005. The following main changes have been made:a) duplicate determination has been changed to triplicate determination;b) information on the shape of the scribe marks has been added;c) the width of the scribe marks has been changed to be in line with EN

26、3665;d) a note on using the CASS test for initiating filiform corrosion was added;e) the supplementary test conditions previously in Annex A have been integrated in the test report.ISO 4623 consists of the following parts, under the general title Paints and varnishes Determination of resistance to f

27、iliform corrosion: Part 1: Steel substrates Part 2: Aluminium substratesiv ISO 2016 All rights reservedBS EN ISO 4623-2:2016ISO 4623-2:2016(E)IntroductionA scribe mark cut through a coating of paints or varnishes on metal can give rise to various types of corrosion, such as blistering of the coating

28、, corrosion of the metal under the coating as well as filiform corrosion. Filiform corrosion tends to develop under specific conditions of temperature and relative humidity and when traces of acids, bases or salts are present either under the paint coating or at breaks in the coating. These conditio

29、ns are often found in marine and/or industrial environments. A certain amount of under-corrosion of the coating, starting from the scribe mark, will always occur. Filiform corrosion, however, is considered to be present only if the typical pattern in the form of threads is obvious. ISO 2016 All righ

30、ts reserved vBS EN ISO 4623-2:2016BS EN ISO 4623-2:2016Paints and varnishes Determination of resistance to filiform corrosion Part 2: Aluminium substrates1 ScopeThis part of ISO 4623 describes a test procedure for assessing the protective action of coatings of paints or varnishes on aluminium agains

31、t filiform corrosion arising from a scribe mark cut through the coating.It is only suitable for assessing the performance of the coating/substrate combination tested. It is not suitable for predicting the performance of the coating on different substrates.2 Normative referencesThe following referenc

32、ed documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 1513, Paints an

33、d varnishes Examination and preparation of test samplesISO 1514, Paints and varnishes Standard panels for testingISO 2808, Paints and varnishes Determination of film thicknessISO 3270, Paints and varnishes and their raw materials Temperatures and humidities for conditioning and testingISO 4628-8, Pa

34、ints and varnishes Evaluation of degradation of coatings Designation of quantity and size of defects, and of intensity of uniform changes in appearance Part 8: Assessment of degree of delamination and corrosion around a scribe or other artificial defectISO 4628-10, Paints and varnishes Evaluation of

35、 degradation of coatings Designation of quantity and size of defects, and of intensity of uniform changes in appearance Part 10: Assessment of degree of filiform corrosionISO 15528, Paints, varnishes and raw materials for paints and varnishes Sampling3 Terms and definitionsFor the purposes of this d

36、ocument, the following terms and definitions apply.3.1filiform corrosiontype of corrosion proceeding under a coat of paint, varnish or related product, in the form of threads, generally starting from bare edges or from local damage to the coatingNote 1 to entry: Usually the threads are irregular in

37、length and direction of growth, but they may also be nearly parallel and of approximately equal length. They usually follow the extrusion direction and do not cross over one another. They need to be initiated by aggressive ions.INTERNATIONAL STANDARD ISO 4623-2:2016(E) ISO 2016 All rights reserved 1

38、BS EN ISO 4623-2:2016ISO 4623-2:2016(E)4 PrincipleA coated test panel is scribed as defined in 9.2. A small amount of hydrochloric acid is introduced into the scribe mark through exposure to hydrochloric acid vapour. The panel is then exposed in a test cabinet at 40 C and a relative humidity of 82 %

39、. The effects of exposure are then evaluated by criteria agreed in advance between the interested parties; these criteria usually being either of a subjective nature or as given in ISO 4628-10.5 SamplingTake a representative sample of the product to be tested (or of each product in the case of a mul

40、ti-coat system), as specified in ISO 15528.Examine and prepare each sample for testing, as specified in ISO 1513.6 ApparatusOrdinary laboratory apparatus and glassware, together with the following:6.1 Test cabinet, capable of being maintained at (40 2) C and a relative humidity of (82 5) %. The cabi

41、net shall have provision for maintaining the panels in a horizontal position (see Note) at least 20 mm apart or, if specified, provision for placing or hanging the test panels in an approximately vertical position so that the distance between the faces of adjacent panels is at least 20 mm.NOTE Due t

42、o the hygroscopic action of the hydrochloric acid in the scribe mark, mixtures of water droplets and hydrochloric acid can be formed. Horizontal exposure will result in more corrosion which proceeds in a more regular manner along the length of each scribe mark.6.2 Container, made of acid-resistant m

43、aterial, with a lid, and capable of holding the test panels at a distance of (100 10) mm from the surface of the acid and at least 20 mm from each other.6.3 Scribe tool, consisting of a sharp instrument which will produce scribe marks with the dimensions specified in 9.2 and with well-defined edges.

44、 There are many scribe tools available, and the result of the test will vary depending on the tool used. A description of the scribe tool shall be given in the test report see Clause 12, item d).6.4 Ruler, accurate to 1 mm.7 Reagents7.1 Hydrochloric acid, of analytical grade, concentration 37 % ( =

45、1,19 g/cm3).The quality and purity of the hydrochloric acid shall be kept constant.8 Test panels8.1 Material and dimensionsThe test panels shall be of aluminium complying with the requirements of ISO 1514 and of minimum dimensions 100 mm 70 mm 0,8 mm, unless otherwise specified, the short dimension

46、being in the direction of rolling of the metal.2 ISO 2016 All rights reservedBS EN ISO 4623-2:2016ISO 4623-2:2016(E)8.2 Preparation and coatingPrepare the test panels as described in ISO 1514, unless otherwise specified, and then coat them by the specified method with the product or system under tes

47、t.Unless otherwise specified, the back and edges of the panel shall also be coated with the product or system under test.If the coating on the back and edges of the panel differs from that of the product under test, it shall have corrosion resistance greater than that of the product under test.8.3 D

48、rying and conditioningDry (or stove) and age (if applicable) each coated test panel for the specified time under the specified conditions, and, unless otherwise specified, condition them at the standard temperature and relative humidity defined in ISO 3270 for at least 16 h, with free circulation of

49、 air and without exposing them to direct sunlight. The test procedure shall then be carried out as soon as possible.8.4 Thickness of coatingDetermine the thickness, in micrometres, of the dried coating by one of the non-destructive procedures described in ISO 2808.9 Procedure9.1 DeterminationCarry out all tests in triplicate unless otherwise agreed.9.2 Scribing the test panelsUnless otherwise specified, make two scribe marks, each at least 30 mm long, on each test panel, making the scribe marks perpendicular to ea