Polyurethanes coatings derived from vegetable oil with and without addition of cor...
| Grant number: | 18/09040-9 |
| Support type: | Scholarships abroad - Research Internship - Doctorate |
| Effective date (Start): | June 01, 2018 |
| Effective date (End): | May 31, 2019 |
| Field of knowledge: | Engineering - Materials and Metallurgical Engineering |
| Principal Investigator: | Assis Vicente Benedetti |
| Grantee: | Jéssica Verger Nardeli |
| Supervisor abroad: | Maria de Fatima Grilo da Costa Montemor |
| Home Institution: | Instituto de Química (IQ). Universidade Estadual Paulista (UNESP). Campus de Araraquara. Araraquara , SP, Brazil |
| Local de pesquisa : | Instituto Superior Técnico (IST), Portugal |
| Associated to the scholarship: | 15/10554-9 - Polyurethanes coatings derived from vegetable oil with and without addition of corrosion inhibitors: chemical, structural and corrosion resistance, BP.DR |
Abstract The aim of this project is to apply electrochemical techniques with high spatial resolution, namely VET (Electrochemical Impedance Spectroscopy (LEIS) and Volta (Scanning Kelvin Probe, SKP)) to investigate the development and inhibition of corrosion process located in aluminum alloys AA1200, AA2024, AA7475 protected with organic coating of polyurethanes, with and without addition of corrosion inhibitors. The aim is mainly to study the beginning of the corrosion process and its inhibition, thus evaluating the self-healing capacity and the delamination speed of the coatings. Corrosion inhibitors are added in different amounts to the organic coating to study their effects on corrosion protection and on the chemical, structural and electrochemical properties of polyurethane coatings applied on aluminum alloys by extensometer (adjustable applicator), spray or roller manual painting. The focus of the studies has two aspects: 1) surface characterization of the coated samples, before and after exposure to an aggressive electrolyte, performed by scanning electron microscopy (SEM) and surface microanalysis (EDXS); 2) conventional and localized electrochemical characterization (EIS) and localized (SVET, LEIS, SKP) in order to understand the inhibition of corrosion, ability to regenerate (self-healing) the coating delamination process. The preparation and application of the coatings in the aluminum alloys and the conventional electrochemical study (electrochemical impedance) are being carried out in Brazil and the electrochemical studies with localized techniques will be carried out at the University of Lisbon, which will allow to evaluate the beginning of the corrosion process, the protective properties of the coating, the delamination (or not) conditions and the regeneration capacity of artificially damaged coatings, complementing our research. | |