Corrosion protection of AZ91D magnesium alloy by a duplex coating

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Published: Oct 30, 2020
DOI: https://doi.org/10.2298/JSC200221027F
Keywords:
Mg substrate anticorrosion electrodeposited polypyrrole molyb¬date salycilate

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Ana Deisy Forero Lopez
Chemical Engineering Department, Institute of Electrochemical and Corrosion Engineering, National University of the South, CONICET, Argentina
Ana Paula Loperena
Chemical Engineering Department, Institute of Electrochemical and Corrosion Engineering, National University of the South, CONICET, Argentina
Ivana Leticia Lehr
Chemical Engineering Department, Institute of Electrochemical and Corrosion Engineering, National University of the South, CONICET, Argentina
https://orcid.org/0000-0002-4390-9009
Lorena Ines Brugnoni
Department of Biology, Biochemistry and Pharmacy, Institute of Biological and Biomedical Sciences of the South, National University of the South, CONICET, Argentina
Silvana Beatriz Saidman
Chemical Engineering Department, Institute of Electrochemical and Corrosion Engineering, National University of the South, CONICET, Argentina

Abstract

A duplex coating was formed under potentiostatic conditions on mag­nesium alloy AZ91D in order to improve its corrosion resistance in a simulated physiological environment. The first layer was formed by anodizat­ion at low potentials in molybdate solution. The outer layer was a PPy film electro­synthesized in sodium salicylate solution. The conditions of the form­ation were determined to obtain a layer with globular morphology. The bilayer was characterized by scanning electron microscopy (SEM) and X-ray diffract­ion (XRD). The corrosion protection properties of the coatings were examined in Ringer solution by monitoring the open circuit potential (OCP), polarization techniques, and electrochemical impedance spectroscopy (EIS). The obtained results showed that the bilayer improves the corrosion resistance of the sub­strate. Moreover, the duplex coating presented better anticorrosive properties than a single PPy film. Afterwards, the bilayer was modified by cementation of silver ions from a solution containing AgNO3. The modified electrode exhi­bited good antibacterial properties.

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How to Cite
[1]
A. D. Forero Lopez, A. P. Loperena, I. L. Lehr, L. I. Brugnoni, and S. B. Saidman, “Corrosion protection of AZ91D magnesium alloy by a duplex coating”, J. Serb. Chem. Soc., vol. 85, no. 10, pp. 1317–1328, Oct. 2020.
Issue
Vol. 85 No. 10 (2020)
Section
Electrochemistry

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