The inhibitory and comparative effects of Zn-Al layered double hydroxide microcontainers intercalated with benzotriazole and nitrite for corrosion protection coatings on AISI 1010 carbon steel

Autori

  • Anelize Seniski
  • Rafael Frasson Monteiro
  • Gilberto Teixeira Carrera
  • Mariana d’Orey Gaivão Portella Bragança
  • Kleber Franke Portella

Abstract

The electrochemical impedance spectroscopy and the open circuit potential techniques were used to analyse coatings with layered double hydroxides intercalated with benzotriazole (BTA), nitrite (NO2), and a combination of the two. These materials were added 5% (m/m) to epoxy resin and applied on carbon steel surface as an anticorrosive system. The analyses were performed during 1000 h of salt spray chamber exposure. Morphology and particle distribution on the coatings were characterized by FEG-SEM. The LDH BTA formed a complex with zinc from the LDH layer and a phase based on ZnO/ZnOH, as shown by XRD analysis. This complex may have impaired the LDH-BTA- corrosion inhibition process, as it formed an undesired phase on Zn-Al layers. The LDH NO2- enhanced corrosion resistance, inducing formation of a passivating layer on the metal surface due to corrosion inhibitor release and chloride ion capture.  Keywords: LDH, Zn-Al- NO2-, Zn-Al- BTA-, Corrosion, Electrochemical impedance spectroscopy

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Pubblicato

2020-08-04

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