With one of the largest capacities of any independent laboratory, Element’s globally located laboratories offer multiple cathodic disbondment tests across a range of internationally recognized standards including ISO, ASTM, NACE and CSA.

Cathodic disbondment is the breakdown of adhesion between a coating and the coated substrate to which it is applied, caused by cathodic reaction products being formed at defects (holidays) in the coating film as the cathodic protection current passes into the substrate at the defective area. This leads to formation of hydroxyl groups at the cathode (the substrate) and a polarized potential which can cause the adhesion loss of the coating, and so disbondment from the substrate.

The purpose of cathodic disbondment testing is to investigate the behavior of the coating system when subjected to either sacrificial or impressed current flows. 

Cathodic disbondment testing is often used as part of a suite of tests to determine a coating’s suitability for different environments. It is also used as a stand-alone test to assess a coating schemes interaction with the cathodic protection system. Element provides cathodic disbondment tests that cover a wide range of test durations from hours to months, as well as different voltages, and temperatures which range from ambient to 204°C.

 

Cathodic disbondment test methods 

Each test method has its own set of parameters and test conditions. With many test methods to choose from, Element’s Engaged Experts help you select the process that is most appropriate for your project needs.

 

Cathodic disbondment testing at elevated temperatures  

As temperatures are continually increasing in the offshore Oil & Gas and pipeline industry, there is an increasing demand for testing at high temperatures to understand coating degradation better. Element conducts cathodic disbondment tests for offshore structural coatings that simulate the exposure conditions for coatings on submerged high-temperature structures. 

Examples of the cathodic disbondment standards we test

ISO 21809-1 and -3 (ambient and elevated temperature)
ISO 15711
ISO 12944-9
Norsok M-501 (ambient and elevated for System 7C, up to 204°C(400F))
NACE TM104, 204, 304, 404
NACE SP0394 (elevated temperature)
CSA Z245.20 and 21

Association Française de Normalisation
AFNOR NF A49-711 (1992), Annex K
AFNOR NF EN 10329 (A49-716), Annex E
AFNOR NF-A 49.711, NF-A 49-716

National Association of Corrosion Engineers
NACE RP0394-2002, Appendix F
NACE TM0104, 
NACE TM0304, 
NACE RP0394, App F
NACE SP0394

Canadian Standards Association
CSA Z245.20-14 Update No.1, Mar-15 Sec. 12.8, 
CSA Z245.20 Section 12.8; 

International Organization for Standardization 
ISO 21809 
ISO 20340 
ISO 15711

American Society for Testing and Materials
ASTM G8
ASTM G42 (elevated temperature)
ASTM G95 

British Standards Institution
BS 3900: Part F11:1985

European Standards
EN 10329; NF-A 49-710 

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