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Enhancing the Corrosion Protection of AA2024-T3 Alloy by Surface Treatments Based on Piperazine-Modified Hybrid Sol–Gel Films

AuthorsCarbonell, Diógenes J.; Montoya, Rodrigo; Gelling, Victoria J.; Galván, Juan Carlos; Jiménez-Morales, Antonia
Issue Date21-Apr-2020
PublisherMultidisciplinary Digital Publishing Institute
CitationMetals 10 (4): 539 (2020)
AbstractThe aim of this study was to develop new chrome-free surface pretreatments for AA2024-T3 aluminum alloy. These pretreatments were based on hybrid organic&ndash;inorganic sol&ndash;gel thin films prepared from mixtures of &gamma;-methacryloxypropyltrimethoxysilane (MAPTMS) and tetramethylorthosilicate (TMOS). Different MAPTMS/TMOS molar ratios were used for optimizing the physical&ndash;chemical characteristics of the sol&ndash;gel films. The formulation of a set of these sols was modified by incorporating piperazine (1,4-diazacyclohexane) as a corrosion inhibitor. The resulting sol&ndash;gel films were characterized by using Fourier transform infrared spectroscopy (FTIR), liquid-state <sup>29</sup>Si nuclear magnetic resonance spectroscopy (<sup>29</sup>Si-NMR) and viscosity measurements. The corrosion performance of the sol&ndash;gel films was analyzed by using electrochemical impedance spectroscopy (EIS) and local electrochemical impedance mapping (LEIM). The characterization techniques indicated that piperazine behaved as a catalyst for the condensation reaction during the formation of the MAPTMS/TMOS organopolysiloxane network and produces an increase of the crosslinking degree of the sol&ndash;gel films. EIS and LEIM results showed that piperazine is an effective corrosion inhibitor, which can be used to enhance the active corrosion protection performance of sol&ndash;gel films.
Identifiersdoi: 10.3390/met10040539
Appears in Collections:Colección MDPI
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