1、July 2011 Translation by DIN-Sprachendienst.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 8
2、7.040!$s:“1805823www.din.deDDIN EN ISO 29601Paints and varnishes Corrosion protection by protective paint systems Assessment of porosity in a dry film (ISO 29601:2011)English translation of DIN EN ISO 29601:2011-07Beschichtungsstoffe Korrosionsschutz durch Beschichtungssysteme Beurteilung der Porosi
3、tt einer trockenen Beschichtung (ISO 29601:2011)Englische bersetzung von DIN EN ISO 29601:2011-07Peintures et vernis Anticorrosion par systmes de peinture valuation de la porosit dun feuil sec (ISO 29601:2011)Traduction anglaise de DIN EN ISO 29601:2011-07www.beuth.deDocument comprises pagesIn case
4、of doubt, the German-language original shall be considered authoritative.1507.11 DIN EN ISO 29601:2011-07 2 A comma is used as the decimal marker. National foreword This standard has been perpared by Technical Committee CEN/TC 139 “Paints and varnishes”, Working Group WG 12 “Test methods and interpr
5、etation of test results of corrosion protection systems” (both secretari-ats: DIN, Germany) in collaboration with ISO/TC 35/SC 14 “Pains and varnishes/Protective paint systems for steel structures” (Secretariat: DIN, Germany). The responsible German body involved in its preparation was the Normenaus
6、schuss Beschichtungsstoffe und Beschichtungen (Coatings and Coating Materials Standards Committee), Working Committee NA 002-00-10 GA Korrosionsschutz von Stahlbauten, Subcommittee NA 002-00-10-05 GUA Korrosions-schutzstoffe und -systeme, einschlielich Prfung. The DIN Standards corresponding to the
7、International Standards referred to in this document are as follows: ISO 12944-1 DIN EN ISO 12944-1 ISO 12944-2 DIN EN ISO 12944-2 ISO 12944-3 DIN EN ISO 12944-3 ISO 12944-4 DIN EN ISO 12944-4 ISO 12944-5 DIN EN ISO 12944-5 ISO 12944-6 DIN EN ISO 12944-6 ISO 12944-7 DIN EN ISO 12944-7 ISO 12944-8 DI
8、N EN ISO 12944-8 ISO 16276-1 DIN EN ISO 16276-1 ISO 16276-2 DIN EN ISO 16276-2 National Annex NA (informative) Bibliography DIN EN ISO 12944-1, Paints and varnishes Corrosion protection of steel structures by protective paint sys-tems Part 1: General introduction DIN EN ISO 12944-2, Paints and varni
9、shes Corrosion protection of steel structures by protective paint sys-tems Part 2: Classification of environments DIN EN ISO 12944-3, Paints and varnishes Corrosion protection of steel structures by protective paint sys-tems Part 3: Design considerations DIN EN ISO 12944-4, Paints and varnishes Corr
10、osion protection of steel structures by protective paint sys-tems Part 4: Types of surface and surface preparation DIN EN ISO 12944-5, Paints and varnishes Corrosion protection of steel structures by protective paint sys-tems Part 5: Protective paint systems DIN EN ISO 12944-6, Paints and varnishes
11、Corrosion protection of steel structures by protective paint sys-tems Part 6: Laboratory performance test DIN EN ISO 29601:2011-07 3 DIN EN ISO 12944-7, Paints and varnishes Corrosion protection of steel structures by protective paint sys-tems Part 7: Execution and supervision of paint work DIN EN I
12、SO 12944-8, Paints and varnishes Corrosion protection of steel structures by protective paint sys-tems Part 8: Development of specifications for new work and maintenance DIN EN ISO 16276-1, Corrosion protection of steel structures by protective paint systems Assessment of, and acceptance criteria fo
13、r, the adhesion/cohesion (fracture strength) of a coating Part 1: Pull-off testing DIN EN ISO 16276-2, Corrosion protection of steel structures by protective paint systems Assessment of, and acceptance criteria for, the adhesion/cohesion (fracture strength) of a coating Part 2: Cross-cut testing and
14、 X-cut testing DIN EN ISO 29601:2011-07 4 This page is intentionally blank EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 29601 April 2011 ICS 87.020 English Version Paints and varnishes - Corrosion protection by protective paint systems - Assessment of porosity in a dry film (ISO 29601:20
15、11)Peintures et vernis - Anticorrosion par systmes de peinture - valuation de la porosit dun feuil sec (ISO 29601:2011) Beschichtungsstoffe - Korrosionsschutz durch Beschichtungssysteme - Beurteilung der Porositt einer trockenen Beschichtung (ISO 29601:2011) This European Standard was approved by CE
16、N on 14 April 2011. 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 national standards
17、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 language and notifie
18、d 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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
19、Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2011 CEN All
20、 rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 29601:2011: EContents DIN EN ISO 29601:2011-07 EN ISO 29601:2011 (E) 2 PageForeword3 Introduction .4 1 Scope 5 2 Terms and definitions .5 3 Principle6 4 Test equipment 6 4.1 Low-voltage
21、pinhole detectors.6 4.2 High-voltage spark testers6 5 Procedure .6 5.1 Selection of test method .6 5.2 Low-voltage pinhole detection.7 5.3 High-voltage spark testing7 6 Expression of results 9 7 Test report 9 Bibliography 11 Foreword This document (EN ISO 29601:2011) has been prepared by Technical C
22、ommittee CEN/TC 139 “Paints and varnishes”, the secretariat of which is held by DIN, in collaboration with Technical Committee ISO/TC 35 Paints and varnishes”. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at th
23、e latest by October 2011, and conflicting national standards shall be withdrawn at the latest by October 2011. 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
24、 all such patent rights. According 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, France, Germany, Greece,
25、Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. DIN EN ISO 29601:2011-07 EN ISO 29601:2011 (E) 3 “ Introduction This International Standard supplements the I
26、SO 12944 series (see the Bibliography) with regard to the detection of porosity in a dry film. If specified or agreed, the standard can also be used for other applications. The objective of this International Standard is to achieve uniformity of practice for the detection of porosity in a dry film.
27、The methods chosen entail the detection of porosity using one of two types of equipment, a low-voltage pinhole detector or a high-voltage spark tester. This International Standard complements ISO 19840, which concerns the measurement of the thickness of dry films on rough surfaces, and ISO 16276-1 a
28、nd ISO 16276-2, which concern the measurement of the adhesion of a coating by pull-off testing (Part 1) and by cross-cut and X-cut testing (Part 2). DIN EN ISO 29601:2011-07 EN ISO 29601:2011 (E) 4 1 Scope This International Standard specifies procedures for detecting the presence of porosity in a p
29、rotective paint system of any thickness on a steel or other metallic substrate. The procedures given in this International Standard are based on methods using two different types of test equipment, the choice of equipment depending on the dry film thickness. These procedures are only applicable to t
30、he testing of electrically non-conductive parts of a paint system. The test methods specified are mainly intended for use with new coatings, but can also be used for coatings which have been in service for some time. In the latter case, it is important to bear in mind that the coating might have bee
31、n penetrated by substances in contact with the coating during service. 2 Terms and definitions For the purposes of this document, the following terms and definitions apply. 2.1 porosity presence of one or more discontinuities in a coating 2.2 discontinuity hole, pit, pinhole, void, crack, thin spot,
32、 inclusion, contamination or other flaw in a coating that significantly lowers the dielectric strength of the coating NOTE Certain types of discontinuity can also be described as a holiday. 2.3 nominal dry film thickness NDFT dry film thickness specified for each coat or for the whole paint system I
33、SO 19840:2004 2.4 mean dry film thickness arithmetic mean of all the individual dry film thicknesses in the inspection area ISO 19840:2004 2.5 inspection area designated area for inspection as defined in the specification NOTE If inspection areas are not defined, the whole structure is a single insp
34、ection area. DIN EN ISO 29601:2011-07 EN ISO 29601:2011 (E) 5 3 Principle Porosity in a protective paint system applied to a conductive metal surface is detected either by low-voltage wet-sponge testing or high-voltage spark testing. Low-voltage pinhole detectors use moisture to conduct electrical c
35、urrent through any discontinuity in the coating. High-voltage spark testers generate a spark in a discontinuity when the discontinuity has a lower dielectric strength than the paint system. In both cases, the apparatus is connected to the metal substrate by means of a signal return cable, and a DC v
36、oltage is applied by means of a probe. When a discontinuity is detected, an alarm is triggered. The test voltage is determined by the thickness of the non-conductive part of the coating. 4 Test equipment 4.1 Low-voltage pinhole detectors 4.1.1 Low-voltage pinhole detectors are normally battery-opera
37、ted for portability. They can either be single-voltage, 9 V or 90 V, or dual-voltage, switchable between 9 V and 90 V. To provide an electrically conductive path through any discontinuity in the coating, an open-cell sponge moistened with tap water is used to apply the voltage. 4.1.2 A cable with a
38、suitable spring-operated connector (crocodile clip) is required to make contact to the bare substrate to form the signal return. 4.1.3 The low-voltage pinhole detector needs either a visual or audible alarm to indicate when a discontinuity has been detected. Some designs have both types of alarm. 4.
39、2 High-voltage spark testers 4.2.1 High-voltage spark testers normally have an adjustable output voltage in the range 1 kV to 30 kV. A fixed output voltage is acceptable providing that the coating has sufficient electrical strength to insulate the substrate at the fixed voltage except where disconti
40、nuities are present. High-voltage spark testers in which the voltage can be varied shall have a voltage display to ensure that the correct test voltage is applied. 4.2.2 Equipment shall be operated either by DC or pulsed DC. High-voltage AC generators shall not be used for testing. 4.2.3 A cable wit
41、h a suitable spring-operated connector (crocodile clip) is required to make contact to the bare substrate to form the signal return. 4.2.4 A conductive, high-voltage probe suitable for the task is required to apply the voltage to the coating to be tested. Different probe configurations are available
42、 to deal with a variety of different surface shapes and areas. Probes are made using wire-brush, conductive helical coil or conductive-rubber materials to form the contact electrode. If there is a risk that the coating will be damaged by a metal electrode, conductive rubber materials should preferab
43、ly be used for the electrode. 4.2.5 The equipment requires either an audible or visual alarm to indicate when a spark has been discharged, signifying that a discontinuity has been detected. Some designs have both types of alarm. 5 Procedure 5.1 Selection of test method In order to determine which ty
44、pe of detector is appropriate, the mean dry film thickness of the paint system shall be determined and used as the criterion. If the primer coat is conductive, e.g. a zinc-rich primer, or if the paint to be tested is applied over a metal coating, such as hot-dip-galvanized or thermally sprayed metal
45、s, DIN EN ISO 29601:2011-07 EN ISO 29601:2011 (E) 6 then the value of the mean thickness of the coating system shall be adjusted by subtracting the thickness of the conductive primer or the non-ferrous metal layer. For paint systems with a mean dry film thickness of up to 500 m, low-voltage pinhole
46、detectors shall normally be used. A high-voltage spark tester may, however, be used to test a paint system with a mean dry film thickness less than 500 m, but not less than 300 m, by agreement between the interested parties. For paint systems with a mean dry film thickness greater than 500 m, high-v
47、oltage spark testers shall be used. 5.2 Low-voltage pinhole detection 5.2.1 The test voltage shall normally be 90 V. A test voltage of 9 V may, however, be used for films with a mean dry film thickness of up to 300 m by agreement between the interested parties. 5.2.2 If the coating to be tested has
48、been applied recently, it shall be dried/cured in accordance with the manufacturers instructions prior to testing. In the absence of manufacturers recommendations, the coating shall be dried/cured for at least 10 days in well-ventilated conditions and at a substrate temperature in excess of 15 C and
49、 a relative humidity of less than 80 % prior to testing. 5.2.3 The surface of the coating to be tested shall be dry and free of oil, dirt and other contaminants. 5.2.4 Ensure that the detector is in good working condition before starting the testing. 5.2.5 Wet the sponge with tap water or with tap water to which a wetting agent has been added. Squeeze the sponge so that excess water is removed and the sponge does not drip. 5.2.6 Connect the signal return cable to the bare metal substrate. Make sure that th
