Polyurethanes Coatings derived from vegetable oil with and without addition of corrosion inhibitors: chemical, structural and corrosion resistance.

• Grant number: 15/10554-9
• Support Opportunities: Scholarships in Brazil - Doctorate
• Start date: October 01, 2015
• End date: May 31, 2020
• Field of knowledge: Physical Sciences and Mathematics - Chemistry - Physical-Chemistry
• Principal Investigator: Assis Vicente Benedetti
• Grantee: Jéssica Verger Nardeli
• Host Institution: Instituto de Química (IQ). Universidade Estadual Paulista (UNESP). Campus de Araraquara. Araraquara , SP, Brazil
• Associated scholarship(s): 18/09040-9 - Evaluation of the self-healing properties of polyurethane coatings derived from vegetable oils with and without addition of corrosion inhibitors using localized electrochemical techniques and the study of chemical and structural properties., BE.EP.DR

Abstract

In this project it is proposed the preparation from vegetable oils, and morphological, chemical and electrochemical characterization of organic coatings as resins. The organic coatings are designed to protect aluminum alloys such as ASTM 1200 and ASTM 5052 or ASTM 7075 against corrosion in aggressive media. Various types of microscopy, spectroscopy in the infrared, Raman scattering and electrochemical conventional and localized techniques are going to be employed in this study. The organic coatings are going to be obtained in four steps: (1) transesterification of crambe oil and KOH in CH3OH, followed by characterization of the product; (2) synthesis of hydroxylated polyesters by polyesterification using the ester obtained in (1) with different ratios of phthalic anhydride and trimethylol propane, and monitoring of the product; (3) mixing the toluene diisocyanate (TDI) with oxygenated solvents ethyl acetate and ethylglycol acetate; (4) obtaining the polyurethane resin mixture in proportions 1: 2 and 1: 3 the polyesters with the hydroxylated prepolymer. In this step (4) corrosion inhibitors obtained as extracts from water hyacinth plant are going to be incorporated. The coatings are going to be applied to the Al alloy by spraying, dipping or other procedure. Curing of the coatings will be conducted at room temperature and at accelerated conditions. After the chemical, structural and morphological characterization of the coatings the electrochemical studies will be performed. The corrosion resistance and the film degradation process in NaCl 3.5% aqueous will be evaluated by potential measurements at open circuit, linear and cyclic polarization curves, DC resistance, and electrochemical impedance spectroscopy techniques such as local electrochemical impedance spectroscopy and scanning vibrating electrode technique. The porosity of the coatings will be evaluated from electrochemical measurements.

Scientific publications

(6)

(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)

NARDELI, JESSICA V.; FUGIVARA, CECILIO S.; TARYBA, MARYNA; MONTEMOR, M. F.; BENEDETTI, ASSIS V.. Self-healing ability based on hydrogen bonds in organic coatings for corrosion protection of AA1200. Corrosion Science, v. 177, DEC 2020. (15/10554-9, 18/09040-9)

NARDELI, JESSICA VERGER; FUGIVARA, CECILIO SADAO; PEREIRA PINTO, ELAINE RUZGUS; POLITO, WAGNER LUIZ; MESSADDEQ, YOUNES; LIMA RIBEIRO, SIDNEY JOSE; BENEDETTI, ASSIS VICENTE. Preparation of Polyurethane Monolithic Resins and Modification with a Condensed Tannin-Yielding Self-Healing Property. POLYMERS, v. 11, n. 11, NOV 2019. (18/09040-9, 15/10554-9)

JÉSSICA VERGER NARDELI; CECÍLIO SADAO FUGIVARA; ASSIS VICENTE BENEDETTI. Assessment of Charge Transport Through Barrier Membranes Before Application on Materials Surfaces. MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS, v. 25, 2022-09-09. (15/10554-9, 18/09040-9)

NARDELI, JESSICA V.; FUGIVARA, CECILIO S.; TARYBA, MARYNA; MONTEMOR, M. F.; RIBEIRO, SIDNEY J. L.; BENEDETTI, ASSIS V.. Novel healing coatings based on natural-derived polyurethane modified with tannins for corrosion protection of AA2024-T3. Corrosion Science, v. 162, JAN 2020. (18/09040-9, 15/10554-9)

NARDELI, V, JESSICA; FUGIVARA, CECILIO S.; TARYBA, MARYNA; PINTO, ELAINE R. P.; MONTEMOR, M. F.; BENEDETTI, V, ASSIS. Tannin: A natural corrosion inhibitor for aluminum alloys. Progress in Organic Coatings, v. 135, p. 368-381, OCT 2019. (18/09040-9, 15/10554-9)

NARDELI, JESSICA V.; FUGIVARA, CECILIO S.; TARYBA, MARYNA; MONTEMOR, M. F.; BENEDETTI, ASSIS V.. Biobased self-healing polyurethane coating with Zn micro-flakes for corrosion protection of AA7475. CHEMICAL ENGINEERING JOURNAL, v. 404, JAN 15 2021. (18/09040-9, 15/10554-9)

Academic Publications

(References retrieved automatically from State of São Paulo Research Institutions)

NARDELI, Jéssica Verger. Polyurethane coatings derived from vegetable oils with and without the addition of corrosion inhibitors: chemical, structural and corrosion resistance properties. 2020. Doctoral Thesis - Universidade Estadual Paulista (Unesp). Instituto de Química. Araraquara Araraquara.