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Active Corrosion

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Mikhail L. Zheludkevich – One of the best experts on this subject based on the ideXlab platform.

Mário G.s. Ferreira – One of the best experts on this subject based on the ideXlab platform.

M. G. S. Ferreira – One of the best experts on this subject based on the ideXlab platform.

  • benzotriazole encapsulation in spray dried carboxymethylcellulose microspheres for Active Corrosion protection of carbon steel
    Progress in Organic Coatings, 2020
    Co-Authors: Francyelle Calegari, M. G. S. Ferreira, Bruno Cesar Gregorio Da Silva, Joao Tedim, Marcos Antonio Coelho Berton, Claudia Eliana Bruno Marino

    Abstract Biopolymeric microspheres containing Corrosion inhibitor benzotriazole (BTA) were prepared by a spray-drying technique using carboxymethylcellulose (CMC-Na) as encapsulating material. The resulting microspheres were characterized by FTIR, TGA, SEM and TEM analysis. Microspheres containing BTA have an average diameter of 1.1 μm. FTIR analysis confirmed the presence of the core and encapsulating components. The release studies by UV−Vis spectrophotometry showed that the mechanism of inhibitor release from CMC-Na biopolymeric matrix is based on a hydrogel-swelling-driven mechanism triggered by water presence. Electrochemical impeimpedance specspectroscopy (EIS) measurements on bare carbon steel in NaCl solution revealed that the presence of CMC-Na does not affect the Corrosion inhibition mechanism associated with BTA. Furthermore, the microcapsules were added to an epoxy coating and its Active Corrosion protection performance was also investigated by EIS. The results obtained indicate that capsules loaded with BTA do not affect negatively the barrier properties of the coating, and contribute for the enhancement of the Corrosion protection of the metallic substrate. Therefore, this work shows the potential application of carboxymethylcellulose microspheres for development of new environmentally-friendly microcontainers for Corrosion inhibitors.

  • layered double hydroxide based Active Corrosion protective sealing of plasma electrolytic oxidation sol gel composite coating on aa2024
    Applied Surface Science, 2019
    Co-Authors: A.c. Bouali, M. G. S. Ferreira, Carsten Blawert, M Starykevich, E.a. Straumal, M. Serdechnova, D.c.f. Wieland, Jörg U. Hammel, S.a. Lermontov, Mikhail L. Zheludkevich

    Abstract This work reports a novel approach for growing layered double hydroxide (LDH) films on any plasma electrolytic oxidation (PEO) coated AA2024 independently of the nature of the PEO coating. The specific PEO coating chosen to carry out this work is considered to be not suitable for direct LDH growth because of phase composition and morphological features. In this paper, we describe a new methodology that consists of covering the PEO coating with a thin layer of aluminum oxide based xerogel as the source of aluminate ions for subsequent in-situ LDH growth. X-ray diffraction (XRD) and scanning electron microscope (SEM) images showed a successful formation of LDHs on the surface. An improvement in terms of Active Corrosion protection was also demonstrated by electrochemical impedance spectroscopy (EIS) and scanning vibrating electrode technique (SVET).

  • a novel bilayer system comprising ldh conversion layer and sol gel coating for Active Corrosion protection of aa2024
    Corrosion Science, 2018
    Co-Authors: Kiryl Yasakau, M. G. S. Ferreira, Silvar Kallip, Mikhail L. Zheludkevich, Joao Tedim, A Kuznetsova, M Starykevich

    Abstract In this work Active Corrosion protection of AA2024 by a bilayer system consisting of a LDH (layered double hydroxides) conversion layer coated by a sol-gel film was studied. Impedance and Scanning vibrating electrode technique (SVET) studies demonstrated an efficient Active Corrosion protection and self-healing abilities of the systems containing LDH layer loaded with vanadate Corrosion inhibitor. Microstructural and chemical analysis of the surface after Corrosion testing showed accumulation of chlorine signal in LDH coatings. The scavenging of chlorides and release of vanadate inhibitor from LDH can explain high efficiency of Corrosion inhibition of AA2024 by the novel protective system.

Kiryl Yasakau – One of the best experts on this subject based on the ideXlab platform.

Dmitry G. Shchukin – One of the best experts on this subject based on the ideXlab platform.