Comparison between the effect of iron oxide and micaceous iron oxide into intermediate layer on zinc rich epoxy primer by EIS

Comparison between the effect of iron oxide and micaceous iron oxide into intermediate layer on zinc rich epoxy primer by EIS

Castro, B. F. de; Macanhan, R.; Valentini, M. I.; Berton, M. A. C.

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Protective epoxy organic coatings can be modified in their formulations to reach better characteristics and protective properties against corrosion. In order to study and evaluate the changes in the organic coating regarding its protection capacity against corrosion, the electrochemical impedance spectroscopy (EIS) employing a 3.5% NaCl solution (in mass), was used. Carbon steel samples were covered with the organic coating (primer + intermediate layer). For comparison purposes, the same zinc rich epoxy primer was used in analyzed samples. The intermediate layer with and without micáceo iron oxide was applied over the primer. The results obtained by EIS showed significant good results for samples with micaceo iron oxide into the intermediate layer. The EIS measurements confirm that coating containing MIO present a higher value of resistivity comparing with coating without micaceo iron oxide as pigment. MIO coating presented high resistivity comparing the coating with spherical iron oxide pigment due the longer diffusion pathways produced by micáceo iron oxide lamellar shape.

Protective epoxy organic coatings can be modified in their formulations to reach better characteristics and protective properties against corrosion. In order to study and evaluate the changes in the organic coating regarding its protection capacity against corrosion, the electrochemical impedance spectroscopy (EIS) employing a 3.5% NaCl solution (in mass), was used. Carbon steel samples were covered with the organic coating (primer + intermediate layer). For comparison purposes, the same zinc rich epoxy primer was used in analyzed samples. The intermediate layer with and without micáceo iron oxide was applied over the primer. The results obtained by EIS showed significant good results for samples with micaceo iron oxide into the intermediate layer. The EIS measurements confirm that coating containing MIO present a higher value of resistivity comparing with coating without micaceo iron oxide as pigment. MIO coating presented high resistivity comparing the coating with spherical iron oxide pigment due the longer diffusion pathways produced by micáceo iron oxide lamellar shape.

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DOI: 10.5151/chempro-s3ie2016-12

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Como citar:

Castro, B. F. de; Macanhan, R. ; Valentini, M. I.; Berton, M. A. C.; "Comparison between the effect of iron oxide and micaceous iron oxide into intermediate layer on zinc rich epoxy primer by EIS", p-139-147. In: Proceedings of 2nd International Seminar on Industrial Innovation in Electrochemistry . São Paulo: Blucher, 2016. São Paulo: Blucher, 2016.
ISSN 23184043, DOI 10.5151/chempro-s3ie2016-12