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Thursday, 19 September 2019
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Raw materials & technologies, Applications, Protective & Marine coatings

Comparing corrosion protection of epoxy and polyurethane based coatings

Tuesday, 7 May 2013

Brazilian scientists investigated organic coatings based on epoxy and polyurethane matrices containing polyaniline doped with dodecyl benzene sulfonic acid (Pani-DBSA).

Epoxy and polyurethane based coatings containing polyaniline-DBSA pigments have been compared / Source: Sergey Kolesnikov, Fotolia

Epoxy and polyurethane based coatings containing polyaniline-DBSA pigments have been compared / Source: Sergey Kolesnikov, Fotolia

The coatings were prepared and applied over steel plates (SAE 1020). The plates were submitted to salt spray chamber for up to 30 days in order to evaluate the corrosion protection of these coatings. Scientists analyzed the properties of the coated plates as a function of time by electrochemical impedance spectroscopy, open circuit potential, optical microscopy, and Raman spectroscopy.

Results indicated a decrease in the electrical resistance, increase in capacitance and decrease in open circuit potential. According to the scientists, epoxy based coatings had improved performance when Pani-DBSA was used as pigment; whereas for the polyurethane coatings, Pani-DBSA seems to play an adverse effect. Raman spectroscopy indicated a possible chlorination of the epoxy matrix after 30 days exposure to salt spray chamber.

Read the complete study "A comparative study of epoxy and polyurethane based coatings containing polyaniline-DBSA pigments for corrosion protection on mild steel” by F.B. Diniz, G.F. De Andrade, C.R. Martins and W.M. De Azevedo in Progress in Organic Coatings, Vol. 76, Issue 5, 2013, pp. 912-916.

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