The CD-Test unit tests the adhesion of plastic coatings on steel. For testing, the coating of a
sample (steel pipe) is deliberately damaged so that the steel surface is exposed. Then the sample
is polarized cathodically towards an anode, i.e. the steel is connected to the negative pole of an
adjustable power source (potentiostat of the CD-Tester). After testing, the coating is removed and
the dimension of the disbonding is rated.