DIN EN ISO 14647-2016 Metallic coatings - Determination of porosity in gold coatings on metal substrates - Nitric acid vapour test (ISO 14647 2000) German version EN ISO 14647 2016.pdf

1、November 2016 English price group 10No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 25.220.40!%q%“2587802www.din.de

2、DIN EN ISO 14647Metallic coatings Determination of porosity in gold coatings on metal substrates Nitric acid vapour test (ISO 14647:2000);English version EN ISO 14647:2016,English translation of DIN EN ISO 14647:2016-11Metallische berzge Bestimmung der Porositt in Goldbeschichtungen auf Metallsubstr

3、aten SalpetersureDampftest (ISO 14647:2000);Englische Fassung EN ISO 14647:2016,Englische bersetzung von DIN EN ISO 14647:2016-11Revtements mtalliques Dtermination de la porosit des revtements dor sur les substrats de mtal Essai la vapeur dacide nitrique (ISO 14647:2000);Version anglaise EN ISO 1464

4、7:2016,Traduction anglaise de DIN EN ISO 14647:2016-11www.beuth.deDocument comprises sw pagesDTranslation by DIN-Sprachendienst.In case of doubt, the German-language original shall be considered authoritative.11.16DIN EN ISO 14647:2016-11 2 A comma is used as the decimal marker. National foreword Th

5、e text of ISO 14647:2000 has been prepared by Technical Committee ISO/TC 107 “Metallic and other inorganic coatings” and has been taken over as EN ISO 14647:2016 by Technical Committee CEN/TC 262 “Metallic and other inorganic coatings” (Secretariat: BSI, United Kingdom). The responsible German body

6、involved in its preparation was DIN-Normenausschuss Materialprfung (DIN Standards Committee Materials Testing), Working Committee NA 062-01-61 AA Mess- und Prfverfahren fr metallische und andere anorganische berzge. The DIN Standards corresponding to the International Standards referred to in this d

7、ocument are as follows: ISO 2064 ISO 2080 ISO 10308 DIN EN ISO 2064 DIN EN ISO 2080 DIN EN ISO 10308 The German working committee points out that, in addition to the term “Messstelle” (in the original ISO document referred to as “measuring area” and “measurement area”, respectively), the term “Messf

8、lche” is also commonly used. National Annex NA (informative) Bibliography DIN EN ISO 2064, Metallic and other non-organic coatings Definitions and conventions concerning the measurement of thickness DIN EN ISO 2080, Metallic and other inorganic coatings Surface treatment, metallic and other inorgani

9、c coatings Vocabulary DIN EN ISO 10308, Metallic coatings Review of porosity tests EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 14647 April 2016 ICS 25.220.40 English Version Metallic coatings Determination of porosity in gold coatings on metal substrates Nitric acid vapour test (ISO 146

10、47:2000) Revtements mtalliques Dtermination de la porosit des revtements dor sur les substrats de mtal Essai la vapeur dacide nitrique (ISO 14647:2000) Metallische berzge Bestimmung der Porositt in Goldbeschichtungen auf Metallsubstraten Salpetersure-Dampftest (ISO 14647:2000) This European Standard

11、 was approved by CEN on 2 April 2016. CEN members are bound to comply with the CEN/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 n

12、ational standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member. This European Standard exists 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 la

13、nguage and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Gree

14、ce, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG

15、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 for CEN national Members. Ref. No. EN ISO 14647:2016 EEN ISO 14647:2016 (E) 2 Contents Page European foreword . 3 Foreword 4 Introduction 5 1 Scope 6 2

16、 Normative references 6 3 Terms and definitions . 7 4 Apparatus . 7 5 Reagent . 8 6 Safety . 8 7 Procedure. 8 8 Precision 10 9 Test report 10 Annex A (informative) Time of exposure to nitric acid vapour 11 Annex B (informative) Procedure recommended for avoiding the use of chlorinated hydrocarbons 1

17、2 Bibliography . 13 DIN EN ISO 14647:2016-11 EN ISO 14647:2016 (E) 3 European foreword The text of ISO 14647:2000 has been prepared by Technical Committee ISO/TC 107 “Metallic and other inorganic coatings” of the International Organization for Standardization (ISO) and has been taken over as EN ISO

18、14647:2016 by Technical Committee CEN/TC 262 “Metallic and other inorganic coatings” the secretariat of which is held by BSI. 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 October 2016, and conf

19、licting national standards shall be withdrawn at the latest by October 2016. Attention 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. According

20、 to the CEN-CENELEC Internal Regulations, 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, Gre

21、ece, Hungary, Iceland, Ireland, Italy, 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 14647:2000 has been approved by CEN as EN ISO 14647:2016 with

22、out any modification. DIN EN ISO 14647:2016-11 ForewordISO(theInternationalOrganizationforStandardization)isaworldwidefederationofnationalstandardsbodies (ISOmember bodies). The work of preparing International Standards is normally carried out through ISO technicalcommittees. Each member body intere

23、sted in a subject for which a technical committee has been established hasthe right to be represented on that committee. International organizations, governmental and non-governmental, inliaison with ISO, also take part in the work. ISO collaborates closely with the International ElectrotechnicalCom

24、mission(IEC)onallmattersofelectrotechnicalstandardization.InternationalStandardsaredraftedinaccordancewiththerulesgivenintheISO/IECDirectives,Part3.Draft International Standards adopted by the technical committees are circulated to the member bodies for voting.PublicationasanInternationalStandardreq

25、uiresapprovalbyatleast75%ofthememberbodiescastingavote.Attention is drawn to the possibility that some of the elements of this International Standard may be the subject ofpatentrights.ISOshallnotbeheldresponsibleforidentifyinganyorallsuchpatentrights.International Standard ISO14647 was prepared byTe

26、chnical Committee ISO/TC107, Metallic and other inorganiccoatings,SubcommitteeSC7,Corrosiontests.AnnexesAandBofthisInternationalStandardareforinformationonly.4DIN EN ISO 14647:2016-11 EN ISO 14647:2016 (E) IntroductionGold coatings are often specified for the contacts of separable electrical connect

27、ors and other devices.Electrodeposits are the form of gold that is most used on contacts, although it is also employed as clad metal andas weldments on the contact surface. The intrinsic nobility of gold enables it to resist the formation of insulatingoxidefilmsthatcouldinterferewithreliablecontacto

28、peration.In order that the nobility of gold be assured, porosity, cracks, and other defects in the coating that expose basemetalsubstratesandunderplatesshouldbeminimalorabsent,exceptinthosecases whereitisfeasible touse thecontacts in structures that shield the surface from the environment or where c

29、orrosion inhibiting surface treatmentsfor the deposit are employed. The level of porosity in the coating that may be tolerable depends on the severity ofthe environment to the underplate or substrate, design factors for the contact device like the force with which it ismated, circuit parameters, and

30、 the reliability of contact operation that it is necessary to maintain. Also, whenpresent, the location of pores on the surface is important. If the pores are few in number and are outside the zoneofcontactofthematingsurfaces,theirpresencecanoftenbetolerated.Methods for determining pores on a contac

31、t surface are most suitable if they enable their precise location andnumbers to be determined. Contact surfaces are often curved or irregular in shape, and test methods should besuitableforthem.Inaddition,the severityof porosity-determining tests mayvary. The test method described in thisInternation

32、alStandardisregardedassevere.The relationship of porosity levels revealed by particular tests to contact behavior should be made by the user ofthese tests through practical experience or by judgement. Thus, absence of porosity in the coating may be arequirement for some applications, while a few por

33、es on the critical surfaces may be acceptable for another. Suchacceptance (or pass-fail) criteria should be part of the product specification for the particular product or partrequiringtheporositytest.The test method described is highly sensitive and is capable of detecting virtually all porosity or

34、 other defects ingold coatings that could participate in substrate corrosion reactions. It is rapid, simple and inexpensive. In addition,it can be used on contacts having complex geometry such as pin-socket contacts. However, it is preferred thatdeeplyrecessedsocketsareopenedtoexposetheircriticalsur

35、facespriortotesting.Thetestmethoddescribedisconsidereddestructive inthat itrevealsthepresenceof porositybycontaminating thesurface with corrosion products and by undercutting the coating at pore sites or at the boundaries of unplatedareas.Anypartsexposedtothesetestsshouldnotbeplacedinservice.The tes

36、t described involves corrosion reactions in which the products delineate defect sites in coatings. Since thechemistry, and properties of these products may not resemble those found in natural or service environments,these tests are not recommended for prediction of the electrical performance of cont

37、acts unless correlation is firstestablishedwithserviceexperience.The test method described employs nitric acid (HNO3) vapour at lowrelative humidity. Reaction of the gas mixturewith a corrodible base metal at pore sites produces reaction products that appear as discrete spots on the goldsurface.Indi

38、vidualspotsarecounted withtheaidofalensorlow-powerstereomicroscope.Thetestmethoddescribedis intendedtobeused forquantitative descriptions of porosity(suchasnumberof poresper unit area or per contact) only on coatings that have a pore density sufficiently low that the corrosion sites arewell separate

39、d and can be readily resolved. As a general guideline this can be achieved for pore densities up toabout 100 per square centimetre or per 100 contacts. Above this value the tests are useful for the qualitativedetectionandcomparisonofporosity.5 DIN EN ISO 14647:2016-11 EN ISO 14647:2016 (E) WARNING:

40、This International Standard does not purport to address all of the safety problems, if any,associated with its use. It is the responsibility of the user of this International Standard to establishappropriate safety and health practices and to determine the applicability of regulatory limitations pri

41、or touse.Specificprecautionarymeasuresaregiveninclause6andin7.4,note2.1 ScopeThis International Standard specifies equipment and a method for using nitric acid vapour to determine porosity ingoldcoatings,particularlyelectrodepositsandcladmetalsusedonelectricalcontacts.This method is designed to show

42、 whether the porosity level is less than or greater than some value that, byexperience,isconsideredbytheusertobeacceptablefortheintendedapplication.Itis suitable for inlays or claddings containing 75% or more of gold, for electrodeposits containing 95% or more ofgoldorforsubstratesofcopper,nickeland

43、theiralloysthatarecommonlyusedin electricalcontacts.Thenitricacidvapourtestistooseveretobeusedforgoldcoatingslessthan0,6 G6dm thick.Itisalsonotsuitableforcoatings that are less noble than gold or platinum, such as palladium and its alloys, or gold-flashed palladium anditsalloys.Several other porosit

44、y testing methods are described in ISO10308 and in the literature (see e.g. Bibliography,1and2).2 NormativereferencesThefollowing normative documentscontainprovisionswhich,through referencein this text, constitute provisions ofthis International Standard. For dated references, subsequent amendments

45、to, or revisions of, any of thesepublications do not apply. However, parties to agreements based on this International Standard are encouraged toinvestigate the possibility of applying the most recent editions of the normative documents indicated below. Forundated references, the latest edition of t

46、he normative document referred to applies. Members of ISO and IECmaintainregistersofcurrentlyvalidInternationalStandards.ISO2064, Metallic and other inorganic coatings Definitions and conventions concerning the measurement ofthickness.ISO2079,SurfacetreatmentandmetalliccoatingsGeneralclassificationo

47、fterms.ISO2080,ElectroplatingandrelatedprocessesVocabulary.ISO10308, MetalliccoatingsReviewofporositytests.6DIN EN ISO 14647:2016-11 EN ISO 14647:2016 (E) N1)N2)N1)National footnote: ISO 2079 was replaced in 2008 by ISO 2080. N2)National footnote: ISO 2080 was revised in 2008 and published under a n

48、ew title. 3 TermsanddefinitionsFor the purposes of this International Standard, the terms and definitions given in ISO2079, ISO2080, ISO10308andthefollowingapply.3.1corrosionproductsthose reaction products emanating from the pores that protrude from, or are otherwise attached to, the coatingsurfacea

49、fteravapourtestexposure3.2significantsurfaceseeISO2064:1996,3.1NOTE Itisessentialthatthesignificantsurfacesormeasuringareasoftheparttobetestedareindicatedonthedrawingofthepartorbyprovisionofsuitablymarkedsamples.3.3measuringareaseeISO2064:1996,3.23.4metalliccoatingselectrodeposits,claddings,orothermetalliclayersappliedtothesubstrateNOTE Thecoatingcancompriseasinglemetalliclayeroracombinationofmetalliclayers.3.5porositypresenceofanydiscontinuity,crack,orholeinthecoatingthatexposesadifferentunderlyingmetal3.6unde