EN ISO 15711:2004

SLOVENSKI STANDARD
01-april-2005
Barve in laki - Ugotavljanje odpornosti proti katodni izgubi oprijema premazov,
izpostavljenih morski vodi (ISO 15711:2003)
Paints and varnishes - Determination of resistance to cathodic disbonding of coatings
exposed to sea water (ISO 15711:2003)
Beschichtungsstoffe - Bestimmung des Widerstandes gegen kathodische Enthaftung von
Beschichtungen in Meerwasser (ISO 15711:2003)
Peintures et vernis - Détermination de la résistance au décollement cathodique des
revetements exposés a l'eau de mer (ISO 15711:2003)
Ta slovenski standard je istoveten z: EN ISO 15711:2004
ICS:
87.040 Barve in laki Paints and varnishes
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 15711
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2004
ICS 87.040
English version
Paints and varnishes - Determination of resistance to cathodic
disbonding of coatings exposed to sea water (ISO 15711:2003)
Peintures et vernis - Détermination de la résistance au Beschichtungsstoffe - Bestimmung des Widerstandes
décollement cathodique des revêtements exposés à l'eau gegen kathodische Enthaftung von Beschichtungen in
de mer (ISO 15711:2003) Meerwasser (ISO 15711:2003)
This European Standard was approved by CEN on 21 December 2004.
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 may be obtained on application to the Central Secretariat 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 notified to the Central Secretariat has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,
Slovenia, Spain, Sweden, Switzerland and United Kingdom.
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COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2004 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 15711:2004: E
worldwide for CEN national Members.

Foreword
The text of ISO 15711:2003 has been prepared by Technical Committee ISO/TC 35 "Paints and
varnishes” of the International Organization for Standardization (ISO) and has been taken over
as EN ISO 15711:2004 by Technical Committee CEN/TC 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 June 2005, and conflicting national
standards shall be withdrawn at the latest by June 2005.

According to the CEN/CENELEC Internal Regulations, the national standards organizations of
the following countries are bound to implement this European Standard: Austria, Belgium,
Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary,
Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland,
Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

Endorsement notice
The text of ISO 15711:2003 has been approved by CEN as EN ISO 15711:2004 without any
modifications.
INTERNATIONAL ISO
STANDARD 15711
First edition
2003-05-15
Paints and varnishes — Determination of
resistance to cathodic disbonding of
coatings exposed to sea water
Peintures et vernis — Détermination de la résistance au décollement
cathodique des revêtements exposés à l'eau de mer

Reference number
ISO 15711:2003(E)
©
ISO 2003
ISO 15711:2003(E)
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ii © ISO 2003 — All rights reserved

ISO 15711:2003(E)
Contents Page
Foreword. iv
Introduction . v
1 Scope. 1
2 Normative references. 1
3 Terms and definitions. 2
4 Principle. 2
5 Required supplementary information. 2
6 Test solutions. 2
7 Apparatus. 3
8 Sampling. 5
9 Test panels. 5
10 Procedure. 9
11 Expression of results. 11
12 Precision. 12
13 Test report. 12
Annex A (normative) Required supplementary information . 13
Annex B (normative) Sacrificial anodes — Composition of zinc alloy . 14

ISO 15711:2003(E)
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 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 Commission (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 technical 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 shall 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.
iv © ISO 2003 — All rights reserved

ISO 15711:2003(E)
Introduction
This International Standard describes two methods for determining 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 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 is based on the procedure developed and evaluated by COIPM (Comité International Permanent
pour la Protection des Matériaux 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 method of application of the coating system and other factors.

INTERNATIONAL STANDARD ISO 15711:2003(E)

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 withstand 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 cathodic 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 practical
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 (including 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 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 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 — 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, Paints, varnishes and raw materials for paints and varnishes — Sampling
ISO 15711:2003(E)
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 protection
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 test 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 coated 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, panels 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 the coating's 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 supplementary 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
Concentration
Compound
g/l
Sodium chloride 23,0
Magnesium chloride hexahydrate 9,8
Sodium sulfate decahydrate 8,9
Calcium chloride 1,2
2 © ISO 2003 — All rights reserved

ISO 15711:2003(E)
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 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 material 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 minimum 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
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 electrode
(at 25 °C)
Potential
Electrode
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 MΩ and capable of measuring in the 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 potentiostatically, 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.
ISO 15711:2003(E)
Key
1 potentiostat 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
4 © ISO 2003 — All rights reserved

ISO 15711:2003(E)
7.2 Method B (sacrificial anode)
7.2.1 Test tanks, made of glass or reinforced plastic, with means for thermostatic temperature control and
water circulation/aeration. The capacity of the tanks shall be such that they contain not less than 7,5 l of water
per 1 m of panel surface exposed (if the panel spacing specified in 7.2.2 is adopted, the water:panel-area
ratio well exceeds this figure). The tanks shall be of a depth such that panels 300 mm in height can be fully
immersed with 50 mm of water above the top of the panel.
7.2.2 Test panel racks, non-electrically conductive, to hold panels at no more than 20° to the vertical, at a
minimum panel separation of 30 mm, with 50 mm minimum clearance from the tank walls and insulated from
the tank bottom. Spacing shall be such that the panels do not come into contact with each other.
7.2.3 Standard drill press and milling cutter/slot drill bit, of 3 mm diameter, for introduction of artificial
defects (see 9.5.2).
7.2.4 Electromagnetic dry film thickness meter.
7.2.5 Penknife, for adhesion testing. A knife with a 5 cm to 6 cm blade has been found to be suitable.
7.2.6 Panel edging “tray”, of such dimensions as to enable the panel edges to be dipped in along their full
length.
7.2.7 Zinc anodes, having a composition as described in Annex B, to provide a potential of
(− 1 040 ± 10) mV relative to a saturated calomel reference electrode. Each anode shall have a hole drilled
t
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