Influence of Ce(iii) and Ce(IV) ions on the structural and electrochemical characteristics of PMMA-silica hybrid coatings

• Grant number: 17/14061-2
• Support Opportunities: Scholarships abroad - Research Internship - Doctorate
• Start date: January 01, 2018
• End date: December 31, 2018
• Field of knowledge: Engineering - Materials and Metallurgical Engineering - Nonmetallic Materials
• Principal Investigator: Peter Hammer
• Grantee: Andressa Trentin
• Supervisor: Herman Terryn
• Host Institution: Instituto de Química (IQ). Universidade Estadual Paulista (UNESP). Campus de Araraquara. Araraquara , SP, Brazil
• Institution abroad: Vrije Universiteit Brussel (VUB), Belgium
• Associated to the scholarship: 15/11907-2 - Structure and electrochemical properties of PMMA-silica hybrid coatings modified with cerium and lithium ions., BP.DR

Abstract

Organic-inorganic hybrid coatings constitute a novel environmentally compliant alternative for the hexavalent chromium conversion method used for corrosion protection of metallic surfaces. In this context, PMMA-silica hybrids have been prepared using the sol-gel route by hydrolysis and condensation of the tetraetoxysilane (TEOS) and polymerization of methyl methacrylate (MMA) in the presence of the coupling agent 3-(Trimethoxysilyl)propyl methacrylate (MPTS), resulting in a dense nanocomposite with covalent interaction between both phases. Lithium and cerium salts are added in different quantities into the hybrid matrix to study the effects of addition of corrosion inhibitors on the structural and electrochemical properties of PMMA-silica coatings, deposited on carbon steel and aluminum alloy substrates by dip coating. The investigation of modified hybrids is focused on two main aspects: to provide in-depth information on the effects of Ce (III), Ce (IV) and Li ions on the local medium range structure of the hybrid matrix and to clarify their role on active corrosion inhibition in affected film regions by the self-healing ability. Structural, thermal and conventional electrochemical investigations (electrochemical impedance spectroscopy) are being carried out at the Chemistry Institute (IQ/UNESP) and the results will be presented in the annual report. During the internship at the Vrije Universiteit Brussel the local electrochemical techniques will be employed in parallel with spectroscopic and microscopic surface analysis techniques to evaluate the self-healing functionality of artificially damaged coatings. (AU)

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

TRENTIN, ANDRESSA; HARB, SAMARAH V.; UVIDA, MAYARA C.; PULCINELLI, SANDRA H.; SANTILLI, CELSO V.; MARCOEN, KRISTOF; PLETINCX, SVEN; TERRYN, HERMAN; HAUFFMAN, TOM; HAMMER, PETER. Dual Role of Lithium on the Structure and Self-Healing Ability of PMMA-Silica Coatings on AA7075 Alloy. ACS APPLIED MATERIALS & INTERFACES, v. 11, n. 43, p. 40629-40641, OCT 30 2019. (15/11907-2, 17/14061-2, 15/09342-7)

HARB, V, SAMARAH; BASSOUS, NICOLE J.; DE SOUZA, THIAGO A. C.; TRENTIN, ANDRESSA; PULCINELLI, SANDRA H.; SANTILLI, V, CELSO; WEBSTER, THOMAS J.; LOBO, ANDERSON O.; HAMMER, PETER. Hydroxyapatite and beta-TCP modified PMMA-TiO2 and PMMA-ZrO2 coatings for bioactive corrosion protection of Ti6Al4V implants. Materials Science & Engineering C-Materials for Biological Applications, v. 116, NOV 2020. (15/11907-2, 17/14061-2, 17/02899-1)