Electrophoretic deposition and characterization of chitosan-molybdenum composite coatings

José Anderson Machado Oliveira; Renato Alexandre Costa de Santana; Alcides de Oliveira Wanderley Neto

doi:10.1016/j.carbpol.2020.117382

Electrophoretic deposition and characterization of chitosan-molybdenum composite coatings

Carbohydr Polym. 2021 Mar 1:255:117382. doi: 10.1016/j.carbpol.2020.117382. Epub 2020 Nov 9.

Authors

José Anderson Machado Oliveira¹, Renato Alexandre Costa de Santana², Alcides de Oliveira Wanderley Neto³

Affiliations

¹ Institute of Chemistry, Federal University of Rio Grande do Norte, 59078-970, Natal, RN, Brazil. Electronic address: jmo.anderson@gmail.com.
² Health and Education Center, Federal University of Campina Grande, 58175-000, Cuité, PB, Brazil.
³ Institute of Chemistry, Federal University of Rio Grande do Norte, 59078-970, Natal, RN, Brazil. Electronic address: alcideswanderley@hotmail.com.

PMID: 33436211
DOI: 10.1016/j.carbpol.2020.117382

Abstract

In this paper, the effect of the electric field on the properties of a new chitosan-molybdenum (Chit-Mo) composite coating obtained by electrophoretic deposition (EPD) was investigated. The composite coatings obtained showed different morphologies depending on the conditions used during the deposition process. Chemical composition results and microstructure analysis showed homogeneous distribution of molybdenum in a chitosan matrix. Corrosion test results showed that the Chit-Mo composite coatings can increase corrosion resistance of 1020 steel in NaCl medium (3.5 %). The coatings obtained at 5 V, pH 5.5, and using a low concentration of reagents (suspension 1: chitosan 0.5 g/L and 1 mM sodium molybdate) reached an inhibition efficiency of up to 76.7 %. Therefore, the results obtained in this work prove the achievement of a new class of chitosan-based composite materials with potential application in the protection of metal structures against corrosion.

Keywords: Chitosan; Corrosion; Electrodeposition; Molybdenum.