1、BRITISH STANDARDBS EN ISO 18332:2008Metallic and other inorganic coatings Definitions and conventions concerning porosityICS 25.220.20; 25.220.40g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g
2、37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN ISO 18332:2008This British Standard was published under the authority of the Standards Policy and Strategy Committee on 29 February 2008 BSI 2008ISBN 978 0 580 59400 7National forewordThis British Standard is the UK implementation of EN ISO 18332:20
3、08. It is identical to ISO 18332:2007. It supersedes BS EN 13143:2003 which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee STI/33, Electrodeposited and related coatings.A list of organizations represented on this committee can be obtained on request to its
4、secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations.Amendments/corrigenda issued since publicationDate CommentsEUROPEAN ST
5、ANDARDNORME EUROPENNEEUROPISCHE NORMEN ISO 18332January 2008ICS 25.220.40; 25.220.20 Supersedes EN 13143:2003 English VersionMetallic and other inorganic coatings - Definitions andconventions concerning porosity (ISO 18332:2007)Revtements mtalliques et autres revtementsinorganiques - Dfinitions et p
6、rincipes concernant laporosit (ISO 18332:2007)Metallische und andere anorganische berzge -Definitionen 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
7、 which stipulate the conditions for giving this EuropeanStandard the status of a national standard 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
8、Standard exists in three official versions (English, French, German). A version in any other language 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 s
9、tandards bodies of 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 United K
10、ingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE 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: EFor
11、eword The text of ISO 18332:2007 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 18332:2008 by Technical Committee CEN/TC 262 “Metallic and other inorganic coatin
12、gs“, 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 July 2008, and conflicting national standards shall be withdrawn at the latest by July 2008. Attention
13、 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 13143:2003. According to the CEN/CENELEC Internal Regulations, the
14、national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norw
15、ay, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of ISO 18332:2007 has been approved by CEN as EN ISO 18332:2008 without any modifications. BS EN ISO 18332:2008INTERNATIONALSTANDARDISO18332First edition2007-02-01Referen
16、ce numberISO 18332:2007(E)Metallic and other inorganic coatings Definitions and conventions concerning porosityRevtements mtalliques et autres revtements inorganiques Dfinitions et principes concernant la porositBS EN ISO 18332:2008ii iiiForewordISO (the International Organization for Standardizatio
17、n) is a worldwide federation of national standards bodies(ISO member bodies). The work of preparing International Standards is normally carried out through ISOtechnical committees. Each member body interested in a subject for which a technical committee has beenestablished has the right to be repres
18、ented on that committee. International organizations, governmental andnon-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the InternationalElectrotechnical Commission (IEC) on all matters of electrotechnical standardization.International Standards are dra
19、fted in accordance with the rules given in the ISO/IEC Directives, Part 2.The main task of technical committees is to prepare International Standards. Draft International Standardsadopted by the technical committees are circulated to the member bodies for voting. Publication as anInternational Stand
20、ard requires approval by at least 75 % of the member bodies casting a vote.Attention is drawn to the possibility that some of the elements of this document may be the subject of patentrights. ISO shall not be held responsible for identifying any or all such patent rights.ISO 18332 was prepared by Te
21、chnical Committee ISO/TC 107, Metallic and other inorganic coatings,Subcommittee SC 7, Corrosion tests.BS EN ISO 18332:2008blank1Metallic and other inorganic coatings Definitions and conventions concerning porosity1ScopeThis International Standard defines porosity and its associated terms, and outli
22、nes the principles involved inporosity testing 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 corrosio
23、n-performance standards.2 Normative referencesThe 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 10
24、308:2006, Metallic coatings Review of porosity 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
25、 coatingan essentially circular discontinuity (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 Typical
26、ly, the openings are cracks, micro-holes, 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
27、:1999BS EN ISO 18332:200824 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
28、 purpose of 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 o
29、n the nature 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 test
30、s (liquid immersion 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 El
31、ectrochemical 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
32、 is incorporated 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
33、 towards the 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 d
34、issolution of 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
35、 products which 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 andrelativ
36、e sizes of the 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.BS EN ISO 18332
37、:200836 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 discontinuities
38、 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 engineering drawin
39、g 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 product standard.BS
40、EN ISO 18332:20084Bibliography1 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 speci
41、mens and manufactured articles subjected to corrosion tests4 EN 12508:2000, Corrosion protection of metals and alloys Surface treatment, metallic, and otherinorganic coatings VocabularyBS EN ISO 18332:2008blankBS EN ISO 18332:2008BSI389 Chiswick High RoadLondonW4 4ALBSI British Standards Institution
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