Zn–Al with NO2 as a corrosion inhibitor epoxy-coated carbon steel under artificial atmospheric conditions

Author:

Seniski Anelize12ORCID,Sotiles Anne Raquel3,Vieira Carlos Henrique da Silva4,Bragança Mariana D'Orey Gaivão Portella2,Marino Claudia E.B.1ORCID,Portella Kleber Franke12

Affiliation:

1. Universidade Federal do Paraná – Politécnico/PIPE/UFPR, Curitiba, PR, Brazil

2. Lactec – CP: 19.067, Curitiba, PR, Brazil

3. Universidade Federal do Paraná – Politécnico/PPGQ/UFPR, Curitiba, PR, Brazil

4. Centrais Elétricas do Maranhão, Maranhão, MA, Brazil

Abstract

This study evaluated Zn–Al–NO2 layered double hydroxide as a corrosion inhibitor in a high-thickness epoxy resin coating (200 µm). The layered double hydroxide was tested in a NaCl solution, using electrochemical impedance spectroscopy. The formed oxides were analysed by X-ray diffraction and energy dispersive X-ray spectroscopy. The corrosion resistance of the epoxy coating (with and without layered double hydroxide) was analysed by electrochemical impedance spectroscopy after exposure to a NaCl solution, salt spray, or a weather-O-meter chamber in a simulated atmospheric environment. The electrochemical impedance spectroscopy measurements for the free layered double hydroxide in a NaCl solution revealed that layered double hydroxide prompted the formation of a compact, protective, and insoluble oxide layer on the carbon steel surface. The Cl permeability through the epoxy resin film was 5.88 times lower for the film containing layered double hydroxide than for the control. The layered double hydroxide was added to the epoxy coating at a 5 wt-% to evaluate the behaviour of the coating in aggressive environments. The entry of aggressive ions was controlled by the ability of the layered double hydroxide to capture them and release the corrosion inhibitors. Thus, the layered double hydroxide worked as a trap for these aggressive ions and enhanced the performance of the coating. Therefore, a layered double hydroxide addition could benefit a high-thickness coating exposed to an aggressive environment and UV radiation.

Publisher

SAGE Publications

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