Corrosion protection of 1020 steel by conducting films electrodeposited in methanesulfonic acid

Abstract

1020 steel is widely used in the industrial sector, however it is a reactive metal and susceptible to corrosion, being necessary to use surface coatings to protect the metal in corrosive media. The polyaniline and polypyrrole are conducting polymers that have the ability to inhibit corrosion when deposited in organic media. In this work, corrosion protection was investigated through polyaniline and polypyrrole films electrodeposited in methanesulfonic acid medium. The films were electrodeposited by chronoamperometry and the corrosion tests were performed by potentiodynamic polarization in aggressive sodium chloride medium. The surface of the films was analyzed by scanning electron microscopy. From the polarization it was observed that the polypyrrole film, in relation to the polyaniline film, showed better performance against corrosion. The MEV indicated that the polypyrrole film is homogeneous and adherent, while the polyaniline film showed flaws, allowing the interaction of the metal with the corrosive medium.

Proteção contra corrosão da superfície do aço 1020 contendo polipirrol depositado por cronoamperometria em meio de ácido metanossulfônico

“…Estudos eletroquímicos prévios mostraram que o filme de PPy é depositado no eletrodo de aço através de ensaios de voltametria cíclica. Foi observado que as correntes anódicas começaram a aumentar a partir de +1,0 V vs Ag/AgCl, indicando a oxidação do monômero e deposição do filme polimérico 12 .…”

The Influence of Oxidizing Agent in the Chemical Deposition of Polypyrrole on Lead Alloy Surface

“…(Eslami et al, 2019) Regarding the state of the art of the theme addressed in this study, it is observed that references on "Chemical and electrochemical deposition of polypyrrol on lead alloy surface" are scarce (Eftekhari & Ahmadi, 2006). Regarding deposition on metallic substrates such as magnesium, copper, aluminum, zinc, stainless steel, there is a good database previously published (Menkuer & Ozkazank, 2019;Vera et al, 2014;Sheng et al, 2014;Mortazavi et al, 2019;Samad et al, 2019;Sharifirad et al, 2010;Annibaldi, Rooney, & Breslin, 2012;Ferreira, Liu, & Cho, 2018;Souza, Liu, & Cho, 2018;Liu, Bezerra, & Cho, 2017).…”