Dr. Bernhard Wessling
Ormecon Chemie GmbH & Co. KG, Ammersbek
(a subsidiary of Zipperling Kessler & Co.)
This test is used by us only after successful basic and advanced screening (4.1 to 4.4).
The systems described above (scratched panels) have been subjected to these accelerated corrosion tests for comparison of these test results with our 4-step method (cf. [30]). Underfilm corrosion, blistering and degree of rusting are summarised in Table 1. In this test, as in real life, both the performance of the intact coating on the metal itself, as also the injured (scratch) coating behaviour plays a role. These effects have been tested in the 4 tests shown above, and they are working together in accelerated corrosion tests and in outside weathering or other real corrosion environments.
The tests showed that all three coating systems provide highly efficient corrosion protection and complete suppression of underfilm corrosion over a period of more than 1000 h; especially with top coat 2-C EP no change at all was found even after 1000 h. The other top coats allow some blistering. None of the systems are really failing, but they are slightly different in their overall acceptable performance.
Our 4-step „Scientific Engineering“ test method is able to differentiate much quicker and much more sensitively than do these generally accepted accelerated corrosion tests.
