A Preface
ISO (International Organization for Standardization) is a global alliance of national standards bodies (ISO member bodies). The development of international standards is usually carried out through ISO technical committees. Each member institution interested in a subject on which a technical committee has been established has the right to be represented in the committee. Government and non-governmental international organizations that liaize with standardization organizations are also involved in this work. ISO works closely with the International Electrotechnical Commission (IEC) on all matters of electrical standardization.

International standards are drafted according to the rules given in Part 2 of the ISO/IEC Directive.

The main task of the technical committee is to develop international standards. Draft international standards adopted by the Technical Committee will be circulated to member bodies for voting. Publication as an international standard requires approval by at least 75% of member institutions.

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ISO 15711 was developed by Technical Committee ISO/TC 35, Paints and varnishes, Subcommittee SC 9, General test methods for paints and varnishes.

ISO 15711-2003 “Determination of Cathodic stripping resistance of paints and varnishes exposed to seawater”

Introduction
This standard describes two methods for determining the ability of paints or other organic coatings applied to metal substrates to withstand cathodic debonding. These methods can also provide a basis for comparing specific coatings. The test conditions are more severe than those that might be encountered under normal conditions and therefore may accelerate coating failure. Testing is recommended for at least 26 weeks, so these methods are not suitable as a means of achieving quality control.

The method is applicable to coatings used to protect ships and structures exposed to seawater. Method A is based on procedures developed and evaluated by the COIPM (International Standing Committee for the Protection of Malin Materials).

Test results may be influenced not only by the performance 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.

1 Scope
This standard describes two methods for determining the ability of paints or other organic coatings applied to metal substrates to withstand cathodic debonding when the surface coating may contain or develop discontinuities. These methods are suitable for coatings that are exposed to Marine water, such as those applied to ships or Marine structures. They are not suitable for assessing the ability of coatings to withstand cathodic debonding on terrestrial structures.

Method A involves the use of a cathodic protection circuit where the electrode potential of the test substrate is controlled by a constant potential.

Method B involves the use of a sacrificial anode attached to the test substrate. This reflects the practical method of cathodic protection commonly used on ships.

ISO 15711-2003 “Determination of Cathodic stripping resistance of paints and varnishes exposed to seawater”

2 Normative references
The following references are required for the application of this document. For dated references, only the cited version applies. For undated references, the new version of the reference (including any revisions) applies.

ISO 554, standard atmosphere-specification for conditioning and/or testing

ISO 1513, Paints and varnishes – Examination and preparation of test samples

ISO 1514, Paints and varnishes — Test standard panel

ISO 2808, Paints and varnishes — Determination of film thickness

ISO 3270, Paints and varnishes and their raw materials – temperature and humidity regulated and tested

ISO 3696, analytical laboratory water use – specifications and test methods

ISO 4624, Paints and varnishes — Adhesion pull – off test

ISO 4628-2, Paints and varnishes — Assessment of degradation of coatings — Designation of the number and size of defects and the intensity of uniform changes in appearance — Part 2: Assessment of the degree of foaming

ISO 8501-1, Preparation of steel substrates before application of paint and related products – Visual assessment of surface cleanliness – Part 1: Corrosion class and preparation class of uncoated steel substrates and steel substrates after overall removal of previous coating

ISO 12944-6, Paints and varnishes — Corrosion protection of steel structures by protective coating systems — Part 6: Laboratory performance test methods

ISO 15528, Paints, varnishes and raw materials for paints and varnishes – Sampling

ISO 15711-2003 “Determination of Cathodic stripping resistance of paints and varnishes exposed to seawater”

3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

3.1 Cathode debonding
Failure of bonding between the coating and the metal surface, which is directly attributable to cathodic protection conditions and is often caused by defects in the coating system, such as accidental damage, imperfect application, or excessive coating permeability

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