RT Journal Article
T1 Enhancing the corrosion protection of AA2024-T3 alloy by surface treatments based on Piperazine-modified hybrid sol-gel films
A1 Carbonell Boix, Diogenes José
A1 Montoya, Rodrigo
A1 Gelling, Victoria J.
A1 Galván Sierra, Juan Carlos
A1 Jiménez Morales, Antonia
AB 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 forAA2024-T3 aluminum alloy. These pretreatments were based on hybrid organic–inorganic sol–gelthin films prepared from mixtures of γ-methacryloxypropyltrimethoxysilane (MAPTMS) andtetramethylorthosilicate (TMOS). Di erent MAPTMS/TMOS molar ratios were used for optimizingthe physical–chemical characteristics of the sol–gel films. The formulation of a set of these sols wasmodified by incorporating piperazine (1,4-diazacyclohexane) as a corrosion inhibitor. The resultingsol–gel films were characterized by using Fourier transform infrared spectroscopy (FTIR), liquid-state29Si nuclear magnetic resonance spectroscopy (29Si-NMR) and viscosity measurements. The corrosionperformance of the sol–gel films was analyzed by using electrochemical impedance spectroscopy (EIS)and local electrochemical impedance mapping (LEIM). The characterization techniques indicatedthat piperazine behaved as a catalyst for the condensation reaction during the formation of theMAPTMS/TMOS organopolysiloxane network and produces an increase of the crosslinking degree ofthe 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.
PB MDPI
SN 2075-4701
YR 2020
FD 2020-01-01
LK https://hdl.handle.net/10016/32831
UL https://hdl.handle.net/10016/32831
LA eng
NO This research was funded by the Ministry of Economy and Competitiveness of Spain(MAT2015-65445-C2-1-R and MAT2015-70780-C4-2-P Projects), and the Regional Government of Madrid (Project P2018/NMT-4411 ADITIMAT-CM).
DS e-Archivo
RD 15 sept. 2024