Influence of deposition conditions on the protective behavior of tetraethyl orthosilicate sol–gel films on AA5754 aluminum alloy

Basing on the study of adsorption behavior of glycidoxypropyl-trimethoxy-silane (GTMS), pretreatment method of AA2024-T3 aluminum alloy for sol-gel films was optimized. The morphology, composition and corrosion protective performance of alloy coated with the films were investigated by using FE-SEM, EDS, AFM and EIS. The results showed that the Al matrix exhibited better ability to adsorb GTMS molecules than the second phase particles, especially at lower concentration of GTMS. Further, the 5% GTMS films cover the whole surface, but the selective adsorption behaviors still exist. It was concluded that less second phase particles and smoother surface were benefit to the sol-gel films on aluminum alloy. Depending on this conclusion, the pretreatment method for sol-gel films was optimized. The optimized surface condition conducted with 50 g•L-1 sodium hydroxide and ultrasound at 60 oC for 30 s was obtained. These samples coated with the sol-gel films revealed good anti-corrosion performance. The coverage degree of the films was up to 97.95 %.

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Microstructural Evolution of TiO2 Sol-Gel Thin Films

MRS Proceedings ◽

10.1557/proc-180-425 ◽

1990 ◽

Vol 180 ◽

Cited By ~ 5

Author(s):

J.L. Keddie ◽

E.P. Giannelis

Keyword(s):

Thin Films ◽

Relative Density ◽

Microstructural Evolution ◽

Sol Gel ◽

Dynamic Vacuum ◽

Tio2 Sol ◽

Sol Gel Films ◽

Deposited Films ◽

Deposition Conditions

ABSTRACTBackscattering spectrometry has been used to determine the density of TiO2 sol-gel films. The density of the as-deposited films relative to that of anatase varies slightly with respect to deposition conditions and is approximately 0.5. Annealing at temperatures as high as 750°C increases the relative density to 0.7 with concomitant decreases in the O:Ti ratio and H content but it does not result in complete densification. Film densities are consistently higher for films annealed under dynamic vacuum compared to those in air.

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Preparation of sols from water-alcohol solutions of tetraethyl orthosilicate and SnCl4 and the effect of sol composition on the surface morphology of sol-gel films

Inorganic Materials ◽

10.1134/s0020168507090178 ◽

2007 ◽

Vol 43 (9) ◽

pp. 1010-1014 ◽

Cited By ~ 7

Author(s):

N. K. Plugotarenko ◽

A. N. Korolev ◽

V. V. Petrov ◽

T. N. Nazarova

Keyword(s):

Surface Morphology ◽

Sol Gel ◽

Tetraethyl Orthosilicate ◽

Sol Gel Films ◽

Water Alcohol Solutions ◽

Water Alcohol

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Evaluate Mechanical Behavior of Alumina Coated Aluminum Alloy Using Slow Strain Rates Test in 3.5% of NaCl Solution

Materials Science Forum ◽

10.4028/www.scientific.net/msf.969.242 ◽

2019 ◽

Vol 969 ◽

pp. 242-246

Author(s):

Dalip Singh ◽

Veena Dhayal ◽

D.C. Agarwal

Keyword(s):

Aluminum Alloy ◽

Sol Gel ◽

Dip Coating ◽

Coated Sample ◽

Slow Strain Rate Test ◽

Protective Behavior ◽

Nacl Solution ◽

Alumina Coatings ◽

Coating Methods ◽

Rate Test

This work is concerned with the investigation of the capability of alumina coatings, deposited over aluminum alloy by dip coating methods to improve mechanical properties. Alumina coatings were deposited using oxime-modified aluminum (III) isopropoxide as a sol-gel precursor. The Scanning electron microscopy (SEM-EDX) images of the coated samples suggest deposition of uniform and crack free alumina coatings. The mechanical property of the bare, and dip coated aluminum alloy were investigated by the slow strain rate test in 3.5% of NaCl solution. The coated sample indicate higher ultimate tensile strength, it’s reflect the protective behavior of coating.

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EIS Study of Nanostructured Cerium Molybdate Doped Sol-Gel Films on 2024 Aluminum Alloy

ECS Meeting Abstracts ◽

10.1149/ma2010-01/2/118 ◽

2010 ◽

Keyword(s):

Aluminum Alloy ◽

Sol Gel ◽

2024 Aluminum Alloy ◽

Sol Gel Films

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Study on Surface Modification of Aluminum Alloys by Silicate-Based Hybrid Coating

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.652-654.1792 ◽

2013 ◽

Vol 652-654 ◽

pp. 1792-1798

Author(s):

Jia Yu Wang ◽

Cheng Li

Keyword(s):

Aluminum Alloy ◽

Sol Gel ◽

Corrosion Current ◽

Hybrid Coating ◽

Hybrid Coatings ◽

Protective Behavior ◽

Nacl Solution ◽

2024 Aluminum Alloy ◽

Higher Temperature ◽

Excellent Stability

Silicate-based hybrid coatings were deposited on aluminum alloy substrates following the methodology of sol-gel procedure and are applying to survey the corrosion protective behavior. The results show that the optimal intact and uniform film can be obtained by preparing with Si:Al mole ratio 48:1 and tempering at 140°C. It was noted that this modified hybrid coating reduced the corrosion current density from 1.532×10-4A/cm2 (bare substrate) to 2.782×10-8 A/cm2 in 3.5 wt. % NaCl solution. The coating represents an excellent stability, especially at higher temperature, therefore could offer a significant protection to 2024 aluminum alloy substrates.

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Sol-gel synthesis of textured lanthanum titanate thin films

Journal of Materials Research ◽

10.1557/jmr.2003.0046 ◽

2003 ◽

Vol 18 (2) ◽

pp. 357-362 ◽

Cited By ~ 12

Author(s):

Mary M. Sandstrom ◽

Paul Fuierer

Keyword(s):

Thin Films ◽

Sol Gel ◽

Precursor Solution ◽

Solution Concentration ◽

Optical Measurements ◽

Layered Perovskite ◽

Orientation Factor ◽

Anisotropic Structures ◽

Sol Gel Films ◽

Sol Gel Synthesis

Control over crystallographic orientation in thin films is important, particularly with highly anisotropic structures. Because of its ferroelectric nature, the layered perovskite La2Ti2O7 has interesting piezoelectric and electrooptic properties that may be exploited when films are highly textured. Sol-gel films with an orientation factor of greater than 95% were fabricated without relying on epitaxial (lattice-matching) growth from the substrate. Film orientation and crystallization were confirmed by x-ray diffraction, scanning electron microscopy, atomic force microscopy, and optical measurements. The particle sizes in all precursor solutions were measured by dynamic light scattering experiments. Experimental results indicate that film orientation is a function of precursor solution concentration, size of the molecular clusters in the solution, and film thickness.

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