scholarly journals Silane-Based Hybrid Coatings for the Corrosion Protection of AA 2024-T3 Alloy

2020 ◽  
pp. 58-61 ◽  
Author(s):  
Brenda Diane Pereira Martins ◽  
Laís de Campos Barbieri ◽  
Amanda Alvarenga Coutinho Silva ◽  
Naiana Serafim Goulart ◽  
Renata Batista Rivero Garcia ◽  
...  
Keyword(s):  
Corrosion Protection ◽  
Polarization Resistance ◽  
Sol Gel ◽  
Aerospace Industry ◽  
Hybrid Coatings ◽  
Good Adhesion ◽  
Linear Polarization Resistance ◽  
Aa 2024 ◽  
Aluminum Substrates ◽  
Scanning Electron

In order to contribute to the corrosion protection of aluminum alloys, silane-based hybrid coatings have been widely studied in the aerospace industry for their good adhesion to aluminum substrates, compatibility with organic paintings and to protect the underlying material, in addition to being much less toxic than the commonly used chromatization process. In this work, hybrid and inorganic sol-gel coatings were evaluated as corrosion inhibitor films for AA2024-T3 alloy. The films were characterized by linear polarization resistance (LPR) and scanning electron microscopy (SEM), which indicated that these coatings provide a lower tendency for the substrate corrosion.

Processing and Properties of GPTMS-TEOS Hybrid Coatings on 5083 Aluminium Alloy

2011 ◽  
Vol 239-242 ◽  
pp. 736-742 ◽  
Author(s):  
Hamed Rahimi ◽  
Reza Mozafarinia ◽  
Reza Shoja Razavi ◽  
Ebrahim Paimozd ◽  
Akbar Hojjati Najafabadi
Keyword(s):  
Aluminium Alloy ◽  
Aging Time ◽  
Corrosion Behaviour ◽  
Sol Gel ◽  
Hybrid Coatings ◽  
Hybrid Nanocomposite ◽  
Adhesion Test ◽  
Good Adhesion ◽  
Polarization Behaviour ◽  
Acid Catalyzed

The hybrid nanocomposite coatings were processed in solution using acid-catalyzed hydrolysis and condensation of precursors 3-Glycidoxypropyl trimethoxysilane (GPTMS) and Tetraethoxysilane (TEOS) forming self assembled nanoscale composite. Coating were applied by dipping 5083 aluminium alloy in sol-gel solutions at several stages and different aging times. Effect of GPTMS-TEOS sol's aging time on thickness, adhesion, and corrosion behaviour of hybrid organic-inorganic GPTMS-TEOS sol-gel coatings have been investigated. The results indicated that thickness of hybrid coatings increased but adhesion decreased with increasing aging time. Adhesion test and electrochemical polarization behaviour reveal that if the coating process was chosen correctly, the coating had a good adhesion strength and corrosion resistance.

scholarly journals Study of Ceramic and Hybrid Coatings Produced by the Sol-Gel Method for Corrosion Protection

2009 ◽  
Vol 2 (1) ◽  
pp. 197-203 ◽  
Author(s):  
G. Carbajal-de la Torre ◽  
M. A. Espinosa-Medina ◽  
A. Martinez-Villafane ◽  
J. G. Gonzalez-Rodriguez ◽  
V. M. Castano
Keyword(s):  
Corrosion Protection ◽  
Sol Gel ◽  
Hybrid Coatings ◽  
Gel Method ◽  
Sol Gel Method

Effect of Amino-Modified Silica Nanoparticles on the Corrosion Protection Properties of Epoxy Resin-Silica Hybrid Materials

2008 ◽  
Vol 8 (6) ◽  
pp. 3040-3049 ◽  
Author(s):  
Kung-Chin Chang ◽  
Hui-Fen Lin ◽  
Chang-Yu Lin ◽  
Tai-Hung Kuo ◽  
Hsin-Hua Huang ◽  
...  
Keyword(s):  
Epoxy Resin ◽  
Corrosion Protection ◽  
Hybrid Materials ◽  
Sol Gel ◽  
Covalent Bond ◽  
Surface Hydrophobicity ◽  
Hybrid Coatings ◽  
Morphological Observation ◽  
Modified Silica ◽  
Silica Hybrid

In this paper, a series of organic–inorganic hybrid materials consisting of epoxy resin frameworks and dispersed nanoparticles of amino-modified silica (AMS) were successfully prepared. First of all, the AMS nanoparticles were synthesized by carrying out the conventional acid-catalyzed sol–gel reactions of tetraethyl orthosilicate (TEOS) in the presence of (3-aminopropyl)-trimethoxysilane (APTES) molecules. The as-prepared AMS nanoparticles were then characterized by FTIR, 13C-NMR and 29Si-NMR spectroscopy. Subsequently, a series of hybrid materials were prepared by performing in-situ thermal ring-opening polymerization reactions of epoxy resin in the presence of as-prepared AMS nanoparticles and raw silica (RS) particles. The as-prepared epoxy-silica hybrid materials with AMS nanoparticles were found to show better dispersion capability than that of RS particles existed in hybrid materials based on the morphological observation of transmission electron microscopy (TEM). The hybrid materials containing AMS nanoparticles in the form of coating on cold-rolled steel (CRS) were found to be much superior in corrosion protection over those of hybrid materials with RS particles when tested by a series of electrochemical measurements of potentiodynamic and impedance spectroscopy in 5 wt% aqueous NaCl electrolyte. The increase of corrosion protection effect of hybrid coatings may have probably resulted from the enhancement of the adhesion strength of the hybrid coatings on CRS coupons, which may be attributed to the formation of Fe—O—Si covalent bond at the interface of coating/CRS system based on the FTIR-RAS (reflection absorption spectroscopy) studies. The better dispersion capability of AMS nanoparticles in hybrid materials were found to lead more effectively enhanced molecular barrier property, mechanical strength, surface hydrophobicity and optical clarity as compared to that of RS particles, in the form of coating and membrane, based on the measurements of molecular permeability analysis, dynamic mechanical analysis, contact angle measurements and ultraviolet-visible transmission spectra, respectively.

scholarly journals Study on Corrosion of Macroporous Silicon in Sodium Hydroxide Solution by Electrochemical Methods and Scanning Electron Microscopy

2015 ◽  
Vol 2015 ◽  
pp. 1-7
Author(s):  
Chuan Lai ◽  
Zhen Xiang ◽  
Changlu Liu ◽  
Chaoju Zhu ◽  
Hui Wang ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Linear Polarization ◽  
Polarization Resistance ◽  
Corrosion Current Density ◽  
Corrosion Current ◽  
Open Circuit ◽  
Macroporous Silicon ◽  
Linear Polarization Resistance ◽  
Scanning Electron

The fabricated macroporous silicon with a porosity of 26.33% corrosion in NaOH solution was systemically investigated by open circuit potential measurements, linear polarization measurements, potentiodynamic polarization measurements, and scanning electron microscopy, respectively. Results show that the potential open circuit and linear polarization resistance decreases with the NaOH concentration increasing. The corrosion potential shifts significantly to more negative potentials and corrosion current density increases with NaOH concentration increasing. Adding ethanol to 1.0 M NaOH can lead to the linear polarization resistance decrease, corrosion potentials shift in the positive direction, and corrosion current density increase. In addition, the scanning electron microscopy images demonstrate that the macroporous silicon samples are seriously damaged by 1.0 M NaOH and 1.0 M NaOH/EtOH (30%).

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