Investigations Into the Durability of Corrosion Protection by Epoxy Coatings on Reinforcement


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Title: Investigations Into the Durability of Corrosion Protection by Epoxy Coatings on Reinforcement

Author(s): J. Moersch, N. Brauer, C. Gehlen and P. SchieBl

Publication: Special Publication

Volume: 170


Appears on pages(s): 231-246

Keywords: Coatings; corrosion; epoxy resins; reinforcing steels; tests.

Date: 7/1/1997

Standard test results indicate that the quality of new epoxy coated reinforcement has been improved, but the question in regard to the real durability of these systems in practice has not yet been determined. Therefore, the Institute for Building Materials Research has carried out some investigations to evaluate the durability of the corrosion protection of two different coatings. The results can be summarized as follows: the adhesion test is able to differentiate between effective and non-effective coatings. An evaluation of the durability of the corrosion protection, for the improved coating types with a chromation layer, was not possible within the duration of these tests. The initial results of the Electrochemical Impedance Spectroscopy tests indicate that the coating Type 2 avoids corrosion reaction, if the coating is undamaged. The undamaged coating Type 1 extends the service life because the resistance against the charge transfer through the coating is an order of magnitude higher than that of the reference steel plates. In the case of local damages, both coatings were effective. Considering the initial test results, an extension of service life, compared to uncoated reinforcement by means of a durable limitation of the cathodic area, seems to be possible.