Test Report No 1

Test Conditions: VDA Alternating Test 621-415
Test Duration: 2000 hours

CORRPASSIV^®
compared with high-grade standard systems

In cooperation with one of the leading companies in the German paint industry, work has started on a test programme designed to investigate the performance of corrosion control systems based on the Organic Metal ORMECON^®.

The test basically uses high-performance systems by this manufacturer, consisting of primer and top coat (in some cases with an intermediate layer as well). In each case two-component acrylic, epoxy and polyurethane products are used.

The study is intended to ascertain the influence of substituting a CORRPASSIV^® primer for the standard primer. It also compares the CORRPASSIV^® systems of Ormecon Chemie (likewise consisting of CORRPASSIV^® Primer and a topcoat, in some cases with an intermediate coat) with those of the paint manufacturer.

The coating systems were applied to St-14 test plates that had been sandblasted (SA 2 ½) and degreased.

Results:

• With all epoxy or expoxy/polyurethane systems the use of CORRPASSIV^® primer (20 µm) instead of a standard primer produced equivalent and in some cases even better anticorrosion results. Under-film creep corrosion was found to be much reduced, as was the formation of corrosion products. This is all the more remarkable when one considers the additional factor of a marked reduction in the total film thickness of the system. In all cases, using a CORRPASSIV^® primer permitted a reduction in total film thickness of the order of 20 to 75%!
• The acrylic coatings used in the test were not compatible with the CORRPASSIV^® primer.
• Results of the comparison with the complete CORRPASSIV^® systems produced by Ormecon Chemie were not available at the time of going to press. The samples were integrated in the test at a later date.

High-grade standard industrial system after 1765 hours in the VDA alternating test 621-415:

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Fig. 1: Corrosive attack in the scratch with marked under-film creep corrosion and formation of blisters on both sides of the injury site - clear signs of detachment	Fig. 2: The coating is easily removed in the region of the under-film creep corrosion to reveal massive corrosion products

By contrast, the CORRPASSIV^® system, also after 1765 hours of the VDA alternating test 621-415.

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Fig. 3: Corrosion attack in scratch with marked formation of corrosion products. These however remain confined to the immediate vicinity of the injury site - there is no sign of any under-film creep.	Fig. 4: Here too it is possible to remove the (top) coating - but only by force. Under it, however, the primer is intact. There is no sign of any corrosion attack.

Ormecon Chemie GmbH & Co. KG
- ein Unternehmen der Zipperling Kessler & Co. (GmbH & Co.) -
Ferdinand-Harten-Str. 7 • D-22949 Ammersbek • Tel.: +49-(0)40-604106-0 • Fax: +49-(0)40-604106-51

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