Praseodymium-decorated graphene oxide as a corrosion inhibitor in acidic media for the magnesium AZ31 alloy

N Palaniappan; Ivan S Cole; F Caballero-Briones; Balasubaramanian K; C Lal

doi:10.1039/c8ra05118f

Praseodymium-decorated graphene oxide as a corrosion inhibitor in acidic media for the magnesium AZ31 alloy

RSC Adv. 2018 Oct 9;8(60):34275-34286. doi: 10.1039/c8ra05118f. eCollection 2018 Oct 4.

Authors

N Palaniappan¹, Ivan S Cole², F Caballero-Briones³, Balasubaramanian K⁴, C Lal⁵

Affiliations

¹ Central University of Gujarat 382030 India palaniappancecri@rediffmail.com.
² Advance Manufacturing and Fabrication Research and Innovation, RMIT University Melbourne Vic 3100 Australia.
³ Instituto Politécnico Nacional, Materials and Technologies for Energy, Health and Environment (GESMAT), CICATA Altamira Km 14.5 Carretera Tampico-Puerto Industrial Tamps Mexico.
⁴ Department of Materials Engineering, Defence Institute of Advanced Technology Girinagar Pune 411025 India.
⁵ Harcourt Butler Technical University Kanpur India.

Abstract

In the present work, Pr-decorated graphene oxide was synthesized and tested as a corrosion barrier layer in acidic media for the magnesium AZ31 alloy. The morphology, composition and structure of Pr-decorated graphene oxide sheets were characterized via HRTEM, FESEM, Raman, XRD, DLS, UV and FTIR studies. The corrosion inhibition efficiency on the alloy surface was monitored via microstructural and electrochemical methods. The results indicate that Pr-decorated graphene oxide provides improved protection for the Mg AZ31 alloy compared to conventional epoxy coatings. The proposed mechanism arises from a combination of the barrier activities of the composite, GO + Pr, and the epoxy coating on the Mg alloy in acidic media.