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1、 Reference number ISO 15711:2003(E) ISO 2003 INTERNATIONAL STANDARD ISO 15711 First edition 2003-05-15 Paints and varnishes Determination of resistance to cathodic disbonding of coatings exposed to sea water Peintures et vernis Dtermination de la rsistance au dcollement cathodique des revtements exp
2、oss leau de mer Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/19/2007 03:18:24 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 15711:2003(E) PDF disclaime
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5、le; the PDF-creation parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. ISO 2003 All rights
6、 reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISOs member body in the country of the r
7、equester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2003 All rights reserved Copyright International Organization for Standardization Provided by IHS under license with I
8、SO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/19/2007 03:18:24 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 15711:2003(E) ISO 2003 All rights reserved iii Contents Page Forewordiv Introduction v 1 Scope1 2 Normative references .1 3 Terms and de
9、finitions.2 4 Principle.2 5 Required supplementary information.2 6 Test solutions2 7 Apparatus.3 8 Sampling5 9 Test panels 5 10 Procedure.9 11 Expression of results11 12 Precision12 13 Test report12 Annex A (normative) Required supplementary information13 Annex B (normative) Sacrificial anodes Compo
10、sition of zinc alloy.14 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/19/2007 03:18:24 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 15711:2003(E) iv IS
11、O 2003 All rights reserved Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested
12、 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 ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Comm
13、ission (IEC) on all matters of electrotechnical standardization. International Standards are drafted 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 Standards adopted by the technic
14、al committees are circulated to the member bodies for voting. Publication as an International Standard 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 patent rights. ISO sha
15、ll not be held responsible for identifying any or all such patent rights. ISO 15711 was prepared by Technical Committee ISO/TC 35, Paints and varnishes, Subcommittee SC 9, General test methods for paints and varnishes. Copyright International Organization for Standardization Provided by IHS under li
16、cense with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/19/2007 03:18:24 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 15711:2003(E) ISO 2003 All rights reserved v Introduction This International Standard describes two methods for determining
17、the ability of paint or other organic coatings applied to metallic substrates to withstand cathodic disbonding. These methods may also afford a basis for the comparison of particular coatings. The conditions of test are more severe than those likely to be encountered normally and so coating failure
18、may be accelerated. It is recommended that the test be carried out for a period of at least 26 weeks and hence these methods are not suitable as a means of achieving quality control. The methods are suitable for coatings used for the protection of ships and structures exposed to sea water. Method A
19、is based on the procedure developed and evaluated by COIPM (Comit International Permanent pour la Protection des Matriaux en Milieu Marin). The test result may be influenced not only by the properties of the coating system under test, but also by the nature and preparation of the substrate, the meth
20、od of application of the coating system and other factors. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/19/2007 03:18:24 MDTNo reproduction or networking permitted without license fro
21、m IHS -,-,- Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/19/2007 03:18:24 MDTNo reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARD ISO 15711:20
22、03(E) ISO 2003 All rights reserved 1 Paints and varnishes Determination of resistance to cathodic disbonding of coatings exposed to sea water 1 Scope This International Standard describes two methods for determining the ability of paint, or other organic coatings, applied to metallic substrates to w
23、ithstand cathodic disbonding when the surface coating may contain or develop discontinuities. The methods are applicable to coatings that are exposed to sea water, such as those applied to ships or marine structures. They are not suitable for the assessment of the ability of coatings to withstand ca
24、thodic disbonding on land-based structures. Method A involves the use of a cathodic protection circuit, whereby the electrode potential of the test substrates is controlled potentiostatically. Method B involves the use of sacrificial anodes attached to the test substrates. This reflects the practica
25、l method of cathodic protection commonly used on ships. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (inclu
26、ding any amendments) applies. ISO 554, Standard atmospheres for conditioning and/or testing Specifications ISO 1513, Paints and varnishes Examination and preparation of samples for testing ISO 1514, Paints and varnishes Standard panels for testing ISO 2808, Paints and varnishes Determination of film
27、 thickness ISO 3270, Paints and varnishes and their raw materials Temperatures and humidities for conditioning and testing ISO 3696, Water for analytical laboratory use Specification and test method ISO 4624, Paints and varnishes Pull-off test for adhesion ISO 4628-2, Paints and varnishes Evaluation
28、 of degradation of coatings Designation of quantity and size of defects, and of intensity of uniform changes in appearance Part 2: Assessment of degree of blistering ISO 8501-1, Preparation of steel substrates before application of paints and related products Visual assessment of surface cleanliness
29、 Part 1: Rust grades and preparation grades of uncoated steel substrates and of steel substrates after overall removal of previous coatings ISO 12944-6, Paints and varnishes Corrosion protection of steel structures by protective paint systems Part 6: Laboratory performance test methods ISO 15528, Pa
30、ints, varnishes and raw materials for paints and varnishes Sampling Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/19/2007 03:18:24 MDTNo reproduction or networking permitted without li
31、cense from IHS -,-,- ISO 15711:2003(E) 2 ISO 2003 All rights reserved 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 cathodic disbonding failure of adhesion between a coating and a metallic surface that is directly attributable to cathodic p
32、rotection conditions and that is often initiated by a defect in the coating system, such as accidental damage, imperfect application or excessive permeability of the coating 4 Principle 4.1 Method A (impressed current) A coated test panel is damaged in a defined way. The panel is then exposed in a t
33、est tank and connected to a cathodic protection circuit. The effects of exposure are evaluated against criteria which correspond to ISO 12944-6 (e.g. ISO 4628-2 or ISO 4624). 4.2 Method B (sacrificial anode) A sacrificial metal anode is attached electrically to a metal substrate which has been coate
34、d with the test coating/system. The inherent electrochemical nature of the two metals coupled in this manner establishes the test potential. The coating under test is applied to four panels in total. Two of these panels are protected by the sacrificial metal anodes and the other two, unprotected, pa
35、nels act as controls. Artificial defects are introduced on all four test panels which are then immersed for six months in sea water. After the immersion period, the test panels are removed from the sea water and immediately examined for blister formation and creep from the defect. An assessment of t
36、he coatings performance under cathodic protection conditions is made by comparing the results from the protected and unprotected panels. 5 Required supplementary information For any particular application, the test method specified in this International Standard needs to be completed by supplementar
37、y information. The items of supplementary information are given in Annex A. 6 Test solutions 6.1 Artificial sea water, conforming to the requirements given in Table 1, shall be used unless otherwise agreed (see 6.2). Table 1 Artificial sea water composition Compound Concentration g/l Sodium chloride
38、 23,0 Magnesium chloride hexahydrate 9,8 Sodium sulfate decahydrate 8,9 Calcium chloride 1,2 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/19/2007 03:18:24 MDTNo reproduction or networ
39、king permitted without license from IHS -,-,- ISO 15711:2003(E) ISO 2003 All rights reserved 3 The formulation shall contain no other additives, e.g. EDTA. Use water conforming as a minimum to the requirements of grade 2 of ISO 3696, and chemical reagents of analytical grade, for all solutions. 6.2
40、Natural sea water may be used if specified. If necessary, suspended solids may be removed by filtering through a suitable filter paper. 7 Apparatus Ordinary laboratory apparatus and glassware, together with the following: 7.1 Method A (impressed current) 7.1.1 Test tank, of glass or other inert mate
41、rial that will not affect the pH of the electrolyte (6.1 or 6.2). The tank, either round of diameter not less than 700 mm or rectangular of minimum side 700 mm, shall have a depth of not less then 200 mm. A system for aerating the electrolyte shall be provided. 7.1.2 Anode, of graphite, with a minim
42、um length of 200 mm and a minimum diameter of 10 mm, or of platinum wire, platinum gauze, platinized titanium or other materials which show sufficient resistance to anodic polarization in sea water. 7.1.3 Reference electrode, such as a saturated calomel or Ag/AgCl electrode, constructed from either
43、glass or plastic, with a porous plug. If an Ag/AgCl or other reference electrode is used, it shall be checked against the saturated calomel electrode and measured potentials corrected in accordance with Table 2. Table 2 Potentials of reference electrodes with respect to the standard hydrogen electro
44、de (at 25 C) Electrode Potential V Copper/copper sulfate + 0,32 Silver/silver chloride/saturated KCl + 0,20 Silver/silver chloride/sea water + 0,25 (approx.) Calomel (normal KCl) + 0,28 Calomel (saturated KCl) + 0,25 7.1.4 Voltmeter, with a minimum resistance of 10 M and capable of measuring in the
45、range 0 V to 2 V to the nearest 1 mV. 7.1.5 Cathodic protection circuit, operating from a d.c. supply and capable of maintaining the electrode potential of the test substrate at ( 1 050 5) mV relative to the saturated calomel reference electrode. The potential should preferably be controlled potenti
46、ostatically, but if a potentiostat is not available then a galvanostat may be used. The potential shall be frequently checked and adjusted to ensure that the electrode potential is within the specified limits (see 10.3.1). Typical cathodic protection circuits are shown in Figures 1 and 2. Copyright
47、International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/19/2007 03:18:24 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 15711:2003(E) 4 ISO 2003 All rights reserved Key 1 po
48、tentiostat 4 reference electrode(s) 2 working electrode 5 voltmeter 3 anode 6 test panel Figure 1 Potentiostatically controlled cathodic protection circuit Key 1 voltmeter 4 anode 2 reference electrode 5 d.c. source 3 test panel Figure 2 Galvanostatically controlled cathodic protection circuit Copyright International Organization for Standardization Provided by IHS under license with ISO License