1、BSI Standards PublicationBS EN ISO 17463:2014Paints and varnishes Guidelines for thedetermination of anticorrosiveproperties of organiccoatings by accelerated cyclicelectrochemical technique (ISO17463:2014)BS EN ISO 17463:2014 BRITISH STANDARDNational forewordThis British Standard is the UK implemen
2、tation of EN ISO17463:2014.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.This publication does not purport to include all the necessaryprovis
3、ions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2014. Published by BSI StandardsLimited 2014ISBN 978 0 580 76589 6ICS 87.040Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published unde
4、r the authority of theStandards Policy and Strategy Committee on 31 August 2014.Amendments issued since publicationDate Text affectedEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 17463 August 2014 ICS 87.040 English Version Paints and varnishes - Guidelines for the determination of antico
5、rrosive properties of organic coatings by accelerated cyclic electrochemical technique (ISO 17463:2014) Peintures et vernis - Lignes directrices pour la dtermination des proprits anticorrosives de revtements organiques par une technique lectrochimique cyclique acclre (ISO 17463:2014) Beschichtungsst
6、offe - Richtlinie zur Bestimmung der antikorrosiven Eigenschaften organischer Beschichtungen durch beschleunigte zyklische elektrochemische Verfahren (ISO 17463:2014) This European Standard was approved by CEN on 11 July 2014. CEN members are bound to comply with the CEN/CENELEC Internal Regulations
7、 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 may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member. Thi
8、s 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 notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN memb
9、ers are the national standards bodies 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, Portug
10、al, Romania, Slovakia, Slovenia, Spain, 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 2014 CEN All rights of exploitation in any for
11、m and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 17463:2014 EBS EN ISO 17463:2014EN ISO 17463:2014 (E) 3 Foreword This document (EN ISO 17463:2014) has been prepared by Technical Committee ISO/TC 35 ”Paints and varnishes” in collaboration with Technical Committee CEN/T
12、C 139 “Paints and varnishes” 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 2015, and conflicting national standards shall be withdrawn at the la
13、test by February 2015. 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 to the CEN-CENELEC Internal Regulations, the national
14、 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, Italy, Latvia, Lithuan
15、ia, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement notice The text of ISO 17463:2014 has been approved by CEN as EN ISO 17463:2014 without any modification. BS EN ISO 17463:2014ISO 17463:20
16、14(E) ISO 2014 All rights reserved iiiContents PageForeword ivIntroduction v1 Scope . 12 Normative references 13 Terms and definitions . 14 Principle 24.1 General . 24.2 EIS measurement 34.3 Cathodic polarization 34.4 Potential relaxation . 35 Apparatus . 36 Specimens 36.1 Samples preparation 36.2 E
17、nvironmental control . 36.3 Number of specimens and repeatability of results 47 Procedure. 47.1 EIS measurement 47.2 Cathodic polarization 47.3 Relaxation process . 47.4 Number of cycles . 48 Data presentation 58.1 Graphics for EIS 58.2 Graphics for the potential relaxation . 59 Precision . 510 Test
18、 report . 5Annex A (informative) Typical example of results from coatings 7Bibliography .14BS EN ISO 17463:2014ISO 17463:2014(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing Internati
19、onal Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with IS
20、O, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Par
21、t 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was 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 e
22、lements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent 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 rece
23、ived (see www.iso.org/patents).Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement.For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adh
24、erence to the WTO principles in the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information.The committee responsible for this document is ISO/TC 35, Paints and varnishes, Subcommittee SC 9, General test methods for paints and vanishes.iv ISO 2014 All rights res
25、ervedBS EN ISO 17463:2014ISO 17463:2014(E)IntroductionThis International Standard describes the determination of the anticorrosive properties of organic coatings by means of the accelerated cyclic electrochemical technique (ACET). The method is based on the so called AC/DC/AC procedure. This techniq
26、ue allows comparing the protective and anticorrosive properties of different coating systems on metal in short times and in a qualitative and quantitative way. ACET consists of the application of cycles of EIS (electrochemical impedance spectroscopy) measurements, cathodic polarizations and potentia
27、l relaxation. Degradation of the coating system is accelerated by the cathodic polarization. EIS and potential relaxation monitor the change of the coating system induced by the cathodic polarization. The technique evaluates the permeability of the coating and properties which can be attributed to a
28、dhesion to the substrate. ISO 2014 All rights reserved vBS EN ISO 17463:2014BS EN ISO 17463:2014Paints and varnishes Guidelines for the determination of anticorrosive properties of organic coatings by accelerated cyclic electrochemical technique1 ScopeThis International Standard gives guidelines on
29、how to perform accelerated cyclic electrochemical technique (ACET) with organic protective coatings on metals.This International Standard specifies: the instrumental assembly; the execution of an ACET test and the considerations relative to the samples and electrochemical cell, test parameters and p
30、rocedure.This International Standard also provides guidelines for the presentation of experimental results and other type of information obtained.Some typical examples are shown in an informative annex.2 Normative referencesThe following documents, in whole or in part, are normatively referenced in
31、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 2808, Paints and varnishes Determination of film thicknessISO 3270, Paints and v
32、arnishes and their raw materials Temperatures and humidities for conditioning and testingISO 16773-1, Electrochemical impedance spectroscopy (EIS) on coated and uncoated metallic specimens Part 1: Terms and definitionsISO 16773-2:1), Electrochemical impedance spectroscopy (EIS) on coated and uncoate
33、d metallic specimens Part 2: Collection of data3 Terms and definitionsFor the purposes of this document, the terms and definitions given in ISO 16773-1 and the following apply.3.1cathodic polarizationapplication of a potential Upolmore negative than the open-circuit potential Uocpfor a fixed period
34、of polarization time tpolNote 1 to entry: This value is defined by the operator.1) To be published. Revision of ISO 16773-2:2007.INTERNATIONAL STANDARD ISO 17463:2014(E) ISO 2014 All rights reserved 1BS EN ISO 17463:2014ISO 17463:2014(E)3.2relaxation timetrelaxtime between the cathodic polarization
35、and the beginning of the electrochemical impedance spectroscopy (EIS) measurementNote 1 to entry: This value is defined by the operator.3.3cathodic disbondingfailure of adhesion between a coating and a metallic surface that is directly attributable to cathodic reaction conditions and that is often i
36、nitiated by a defect in the coating system, such as accidental damage, imperfect application or excessive permeability of the coatingSOURCE: ISO 15711:2003, definition 3.13.4cathodic potentialPpotential difference between an applied potential Upoland the open circuit potential Uocp4 Principle4.1 Gen
37、eralThe initial state of the coating system is characterized by an electrochemical impedance spectroscopy (EIS) measurement (EISn-1 see Figure 1). Then a cathodic polarization (Pn) is applied for a certain period of time (tpol) followed by the relaxation process (rn) over the time (trelax). Finally
38、the new state of the coating system is characterized by a second EIS measurement (EISn). These steps define a cycle which can be repeated n number of times (n is the number of cycles).NOTE Typically six cycles are used.KeyX time t, in minY potential U, in VFigure 1 ACET cycle2 ISO 2014 All rights re
39、servedBS EN ISO 17463:2014ISO 17463:2014(E)4.2 EIS measurementA special type of potentiostat intended for EIS is connected to an electrochemical cell. A single-sinusoidal-waveform potential is applied and the resulting alternating current is measured. Both potential and current data are collected an
40、d analysed for amplitude and phase shift. More information about the procedure can be found in ISO 16773-2.4.3 Cathodic polarizationA constant cathodic potential, Upol, is applied. During the polarization, the electrolysis of water can take place if Upolis negative enough:H2O (l) + e H2(g) + OH(aq)
41、The application of the cathodic potential will generate a stress on the protective coating.If the electrolysis takes place at the interface of the coating to the metallic substrate, the hydroxide ions (OH) and/or hydrogen (H2) can cause delamination between the metal and the coating.4.4 Potential re
42、laxationThe purpose of the relaxation process is to allow the formation of a new stable equilibrium before the next EIS measurement is performed. By recording the potential during the relaxation process, valuable additional information about the coating and the coating-metal interface can be obtaine
43、d.5 ApparatusUse the electrochemical equipment specified in ISO 16773-2.6 Specimens6.1 Samples preparationProper preparation and preconditioning of coated specimens is critical for successful and reliable experimental data.6.2 Environmental controlThe coating should be applied and cured in accordanc
44、e with the manufacturers recommendation unless otherwise agreed upon between the parties involved. The film thickness should be as uniform as possible. The exact film thickness should be measured and reported (e.g. in accordance with ISO 2808). Temperature and humidity control during the application
45、, curing, conditioning and measurement of organic coatings is crucial for a proper determination of the coating resistance.For reliable measurements, temperature control should be equal to or better than 1 C. For conditioning prior to measurement, an accuracy of 2 C is sufficient for most cases. Eac
46、h specimen should be kept under controlled conditions in order to prevent post-curing, degradation or any unintended irreversible modification of the coating.The temperature of the specimens during measurements should be maintained constant to within 2 C, preferably within 1 C, at 23 C, if not other
47、wise specified. Relative values for comparison between specimens outside these guidelines are acceptable if all the specimens are run under the same conditions. When the coating capacitance is the main parameter of interest, control of relative humidity during specimen conditioning is very important
48、. To ensure accurate conditioning, the humidity should be (50 5) % in accordance with ISO 3270, if not otherwise agreed. ISO 2014 All rights reserved 3BS EN ISO 17463:2014ISO 17463:2014(E)6.3 Number of specimens and repeatability of resultsCoatings are materials with certain inherent properties: hol
49、idays, inhomogeneous film thickness, and non-uniform distribution of pigments, fillers and other constituents. It is therefore necessary to test more than one panel. In most cases, a minimum of three replicate specimens is necessary for reliable results. It should be checked whether the uniformity between the different specimen plates is sufficient. It is quite common to find repeatability better than 10 % between the capacitance of replicate specimens, but it depends on the type of coating and the conditions of me
