Publication: Enhancing the corrosion protection of AA2024-T3 alloy by surface treatments based on Piperazine-modified hybrid sol-gel films
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To cite this item, use the following identifier: https://hdl.handle.net/10016/32831
Abstract
The aim of this study was to develop new chrome-free surface pretreatments for AA2024-T3 aluminum alloy. These pretreatments were based on hybrid organic-inorganic sol-gel thin films prepared from mixtures of The aim of this study was to develop new chrome-free surface pretreatments for
AA2024-T3 aluminum alloy. These pretreatments were based on hybrid organic–inorganic sol–gel
thin films prepared from mixtures of γ
-methacryloxypropyltrimethoxysilane (MAPTMS) and
tetramethylorthosilicate (TMOS). Di erent MAPTMS/TMOS molar ratios were used for optimizing
the physical–chemical characteristics of the sol–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–gel films were characterized by using Fourier transform infrared spectroscopy (FTIR), liquid-state
29Si nuclear magnetic resonance spectroscopy (29Si-NMR) and viscosity measurements. The corrosion
performance of the sol–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–gel films. EIS and LEIM results showed that piperazine is an e ective corrosion inhibitor,
which can be used to enhance the active corrosion protection performance of sol–gel films.-methacryloxypropyltrimethoxysilane (MAPTMS) and tetramethylorthosilicate (TMOS). Di erent MAPTMS/TMOS molar ratios were used for optimizing the physical-chemical characteristics of the sol-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-gel films were characterized by using Fourier transform infrared spectroscopy (FTIR), liquid-state 29Si nuclear magnetic resonance spectroscopy (29Si-NMR) and viscosity measurements. The corrosion performance of the sol-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-gel films. EIS and LEIM results showed that piperazine is an e ective corrosion inhibitor, which can be used to enhance the active corrosion protection performance of sol-gel films.
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Bibliographic citation
Carbonell, D. J., Montoya, R., Gelling, V. J., Galván, J. C., & Jiménez-Morales, A. (2020). Enhancing the Corrosion Protection of AA2024-T3 Alloy by Surface Treatments Based on Piperazine-Modified Hybrid Sol–Gel Films. Metals, 10(4), 539.