1、April 2008DEUTSCHE NORM English price group 7No part of this standard 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!$NB_“1433160www
2、.din.deDDIN EN ISO 18332Metallic and other inorganic coatings Definitions and conventions concerning porosity (ISO 18332:2007)English version of DIN EN ISO 18332:2008-04Metallische und andere anorganische berzge Definitionen und Festlegungen, die die Porigkeit betreffen (ISO 18332:2007)Englische Fas
3、sung DIN EN ISO 18332:2008-04SupersedesDIN EN 13143:2003-06www.beuth.deDocument comprises 9 pagesDIN EN ISO 18332:2008-04 2 National foreword This standard has been prepared by Technical Committee ISO/TC 107 “Metallic and other inorganic coatings” (Secretariat: KATS, Republic of Korea) and has been
4、adopted as EN ISO 18332:2008 by Technical Committee CEN/TC 262 “Metallic and other inorganic coatings” (Secretariat: BSI, United Kingdom). The responsible German body involved in its preparation was the Normenausschuss Materialprfung (Materials Testing Standards Committee), Technical Committee NA 06
5、2-01-61 AA Mess- und Prfverfahren fr metallische und andere anorganische berzge. The DIN Standards corresponding to the International Standards referred to in the EN are as follows: ISO 8044:1999 DIN EN ISO 8044:1999-11 ISO 10289:1999 DIN EN ISO 10289:2001-04 ISO 10308:2006 DIN EN ISO 10308:2006-04
6、Amendments This standard differs from DIN EN 13143:2003-06 as follows: a) Following the adoption of ISO 18332:2007 as a European Standard, this standard has been published as DIN EN ISO 18332:2008-04. b) Clause 2 “Normative references” has been added. c) Clause 6 “Rating of test specimens” has been
7、extended. Previous editions DIN EN 13143: 2003-06 National Annex NA (informative) Bibliography DIN EN ISO 8044:1999-11, Corrosion of metals and alloys Basic terms and definitions (ISO 8044:1999) DIN EN ISO 10289:2001-04, Methods for corrosion testing of metallic and other inorganic coatings on metal
8、lic substrates Rating of test specimens and manufactured articles subjected to corrosion tests (ISO 10289:1999) DIN EN ISO 10308:2006, Metallic coatings Review of porosity tests (ISO 10308:2006) EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN ISO 18332January 2008ICS 25.220.40; 25.220.20 Supersede
9、s EN 13143:2003 English VersionMetallic and other inorganic coatings - Definitions andconventions concerning porosity (ISO 18332:2007)Revtements mtalliques et autres revtementsinorganiques - Dfinitions et principes concernant laporosit (ISO 18332:2007)Metallische und andere anorganische berzge -Defi
10、nitionen und Festlegungen, die die Porigkeit betreffen(ISO 18332:2007)This European Standard was approved by CEN on 29 December 2007.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 stan
11、dard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other l
12、anguage made by translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finla
13、nd,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE
14、 FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2008 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN ISO 18332:2008: E2 Contents Page Foreword . 3 1 Scope 4 2 Normative references 4 3 Terms and definitions . 4 4 Pur
15、pose of porosity testing 5 5 Principles . 5 5.1 Electrochemical tests 5 5.2 Exposure tests. 5 6 Rating of test specimens 6 7 Test report 6 Bibliography 7 EN ISO 18332:2008 (E) DIN EN ISO 18332:2008-04 3 Foreword The text of ISO 18332:2007 has been prepared by Technical Committee ISO/TC 107 “Metallic
16、 and other inorganic coatings” of the International Organization for Standardization (ISO) and has been taken over as EN ISO 18332:2008 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
17、 of a national standard, either by publication of an identical text or by endorsement, at the latest by July 2008, and conflicting national standards shall be withdrawn at the latest by July 2008. Attention is drawn to the possibility that some of the elements of this document may be the subject of
18、patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 13143:2003. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this Europe
19、an Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United K
20、ingdom. Endorsement notice The text of ISO 18332:2007 has been approved by CEN as EN ISO 18332:2008 without any modifications. EN ISO 18332:2008 (E) DIN EN ISO 18332:2008-04 1ScopeThis International Standard defines porosity and its associated terms, and outlines the principles involved inporosity t
21、esting of metallic and related inorganic coatings. The purpose of porosity testing is also considered,thereby assisting the user to select the most suitable test for the product and its service application.The porosity test cannot be used to establish corrosion-performance standards.2 Normative refe
22、rencesThe following referenced documents are indispensable for the application of this document. For datedreferences, only the edition cited applies. For undated references, the latest edition of the referenced document(including any amendments) applies.ISO 10308:2006, Metallic coatings Review of po
23、rosity tests3 Terms and definitionsFor the purposes of this document, the following terms and definitions apply.3.1 porosityholes, cracks or other discontinuities (3.3) in the coating that expose the underlying metal or substrate to theenvironment3.2 pore in a coatingan essentially circular disconti
24、nuity (3.3) in the surface extending through to the underlying coating or to thebasis metalISO 2080:1981NOTE Types of pores are shown in ISO 10308.3.3 discontinuityopening in an otherwise continuous coating that exposes a different underlying metalNOTE Typically, the openings are cracks, micro-holes
25、, pores or pits in the coating. They can also be voids or breaks in thecoating caused by mechanical damage, such as scratches or non-conductive inclusions in the basis metal (see ISO 10308).3.4 corrosion productsubstance formed as a result of corrosionISO 8044:19994 DIN EN ISO 18332:2008-04 EN ISO 1
26、8332:2008 (E) 4 Purpose of porosity testingThe main purpose of porosity testing is to determine the quality of the coating and its freedom from porosity,particularly on those areas of the significant surface that demand a functional requirement, for example, aselectrical contacts.For the purpose of
27、porosity testing of metallic and related inorganic coatings, there are two modes of corrosionthat need to be considered, i.e. electrochemical and chemical. Either type of test can be used to identify thepresence, distribution and extent of porosity. The test method selected will depend on the nature
28、 of the coating,the basis material and any undercoat.In general, electrochemical tests are of an “accelerated nature”, with relatively short exposure times carried outunder controlled chemical, electrical and physical conditions; these are ideal for process control purposes.Exposure tests (liquid im
29、mersion tests, solution-fog tests, gas atmosphere tests) are usually of long durationand can be either static or cyclic, depending on product requirements, and are particularly suitable forqualification purposes.NOTE For a classification of porosity tests, see ISO 10308.5Principles5.1 Electrochemica
30、l testsIn electrochemical testing, the basis metal/coating combination is generally used as the anode of anelectrochemical cell; a stainless-steel plate or any inert but conductive material can be used as the cathode. Anappropriate indicator responsive to the presence of basis-metal ions is incorpor
31、ated in the electrolyte orconducting medium contained in a filter paper or gel.The object of the test is to create dissolution of the basis metal by the direct application of a positive polarizingvoltage. The resulting basis metal ions will then migrate under the applied electrical field towards the
32、 cathodethrough the conductive paper or gel. The indicator response and the resultant photographic image produceddepends on the extent of the porosity in the coating.NOTE In general, both the constant applied voltage and current can be used for electrochemical and gel techniques.Anodic dissolution o
33、f the coating, which will result in spurious results, is avoided by ensuring that certain maximum valuesare not exceeded.5.2 Exposure testsWhen coated articles are exposed to liquids or corrosive moist vapours, the tiny basis-metal areas at the bottomof the pores react chemically to form products wh
34、ich are either directly observable (corrosion products), visuallyor at low magnification, or which can be made observable by subsequent chemical development. Ideally, thechemical reaction products or “decorations” should remain at pore sites, so that the location, distribution andrelative sizes of t
35、he pores can be easily evaluated.Although porosity tests by exposure with gaseous reactants involves the same pore-corrosion mechanisms asthose occurring in many polluted or corrosive service environments they shall not, however, be used as ameasure of product performance.5 EN ISO 18332:2008 (E) DIN
36、 EN ISO 18332:2008-04 6 Rating of test specimensOn completion of the exposure time, examination/inspection shall be carried out under the viewing conditionsspecified in the product standard. The specimens shall be assessed and rated in terms of one or more of thefollowing: the number of pores and/or
37、 discontinuities per unit area of the significant surface; the percentage of the measurement area covered by the corrosion products or pore indications; the area of the largest marking or corrosion-product spot on the significant surface.NOTE For more details see ISO 10308.The product standard or en
38、gineering drawing shall specify the rating required.7 Test reportThe test report shall contain at least the following information:a) type of test and/or specification number;b) test conditions;c) details of articles tested;d) examination/inspection conditions;e) rating;f) any deviation from the prod
39、uct standard.6 DIN EN ISO 18332:2008-04 EN ISO 18332:2008 (E) Bibliography1 ISO 2080:1981, Electroplating and related processes Vocabulary2 ISO 8044:1999, Corrosion of metals and alloys Basic terms and definitions3 ISO 10289:1999, Methods for corrosion testing of metallic and other inorganic coatings on metallicsubstrates Rating of test specimens and manufactured articles subjected to corrosion tests4 EN 12508:2000, Corrosion protection of metals and alloys Surface treatment, metallic, and otherinorganic coatings Vocabulary7 EN ISO 18332:2008 (E) DIN EN ISO 18332:2008-04
