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Cathodic disbondment test

Cathodic disbondment test: how sensitive is the coating to cathodic disbondment?

To prevent corrosion of steel, a technique called cathodic protection is often used in the offshore industry. By means of a sacrificial anode or a current-pressure system, the anodic potential of the steel is reduced to such an extent that corrosion no longer occurs.

However, this imposed potential can also have an adverse effect on the adhesion of coatings. We call this cathodic detachment. At M2LAB we investigate whether a coating is susceptible to cathodic breakdown by means of the CD-test.

ISO 12944-9 describes three specific tests for coatings applied in the splash zone. Namely the cyclic-, the sea water immersion and the Cathodic Disbondment Test (CD-Test) ISO 15711. The latter is by no means known to everyone.

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How is the cathodic disbondment test performed?

The exact execution of the test depends on the standard to be used. But basically, the test is performed as follows:

Coated test panels are provided with a hole and for 4200 hours, suspended in a tank with artificial seawater. A fixed voltage is then imposed using a potentiostat.

At the end of the test, the detachment of the coating from the hole is determined. If it falls within specifications, the test is successful.

Reporting and advice

Within five business days of completing the cathodic disbondment test, you will receive a report with the results. After reading the report you may still need advice on how to improve the quality of the product. As specialists in the field of industrial surface treatment, our staff always have advice to help you with this.

Call +31 (0)13 463 06 88 for more information on turnaround times for your required laboratory tests.