A manufacturer asked to perform cathodic disbondment tests on blasted steel panels coated with a multi-layer polymer system. The aim was to study the effect of dust and salt contamination on the delamination distance of the coating, under cathodic protection circumstances.
MSC applied salt contamination, primer and adhesive coating patch onto the panels. The level of dust contamination was varied by changing the blasting process conditions; salt contaminations were also varied. Different sets of samples for cathodic delamination tests were prepared internally, with and without salt contamination. Sufficient identically prepared panels were submitted to the test in order to check reproducibility.
Delamination distance was determined and a relative coating performance rating was obtained, clearly identifying the best solution for the application.