Environmentally compliant silica conversion coatings prepared by sol–gel method for aluminum alloys

Hamdy, Abdel Salam; Butt, Darryl P.

doi:10.1016/j.surfcoat.2005.11.142

Cited by 78 publications

(41 citation statements)

References 16 publications

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“…Due to toxicity of Cr 6+ widely researches have been made to develop non-toxic replacements for chromate coatings [6]. Silicate conversion coatings are one of the best introduced alternatives to prevent aluminum alloys from corrosion [20,[22][23][24]. Silicate conversion coatings have attracted significant attention due to effective inhibitory against different types of corrosion [23][24][25][26], low cost [20,23], availability and non-toxic and environmentally friendly [20,23].…”

Section: Introductionmentioning

confidence: 99%

Deposition and corrosion behavior of silicate conversion coatings on aluminum alloy 2024

Kazemi

Danaee

Zaarei

2014

Materialwissenschaft Werkst

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Potassium silicate was deposited on AA2024 aluminum alloy as environmentally friendly conversion coatings and its corrosion behavior were examined by means of electrochemical impedance spectroscopy, potentiodynamic polarization and surfaces techniques. Potentiodynamic polarization curves show significant decrease in corrosion current density of silicate coated aluminum in NaCl solution. The corrosion resistance was increased with increasing silicate concentration of coating baths. The results indicated that the coating applied from 3 molar silicate baths is more uniform and continuous. The X-ray diffraction (XRD) and energy discharge spectroscopy (EDS) spectra confirm the existence of silicate film on the AA2024 surface. The coating performance was evaluated in acidic and basic NaCl solution and the results show the stability of silicate conversion coating in these solutions.

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Section: Introductionmentioning

confidence: 99%

Deposition and corrosion behavior of silicate conversion coatings on aluminum alloy 2024

Kazemi

Danaee

Zaarei

2014

Materialwissenschaft Werkst

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“…The synthesis of non-wetting solid surfaces is an active area of research in recent years because it forms the basis for a number of multidisciplinary applications such as frictionless flow of liquids through nano-/micro-channels and pipes [1], corrosion resistant [2] or non-wetting [3] coatings as well as drug delivery systems [4]. The wetting behavior of a solid surface by a liquid mainly depends on the chemical and microstructural properties of the surface.…”

Section: Introductionmentioning

confidence: 99%

“…The Wenzel's relation shown in Eq. (2) indicates that if the intrinsic contact angle for a liquid on a solid surface is below 90 • (hydrophilic), then an additional "roughening" of this surface will reduce the effective contact angle. In the same way, the contact angle of a hydrophobic surface will increase even more as the surface roughness increases.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of transparent hydrophobic silica thin films by single step sol–gel process and dip coating

Nadargi

Gurav

Hawi

et al. 2010

Journal of Alloys and Compounds

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“…These bonds increase in cross-linking during the high temperature curing process [15] which would significantly reflect on the superior adhesion of this type of coating with metal substrates. In addition the silanol groups (Si-OH) within silica sol gel coating forms a strong covalent bond with the aluminium substrates (Si-O-Al) [16,17]. (2) The stress-strain curves from the tensile tests shown in Figure 5 and the tensile strength of all coating systems are typically equal to 1.1MPa.…”

Section: Mechanical Characterizationmentioning

confidence: 99%

Effects of TiO<sub>2</sub>/SiO<sub>2</sub> Reinforced Nanoparticles on the Mechanical Properties of Green Hybrid Coating

Gobara¹

2015

ILCPA

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Titanium and silica oxides nanoparticles were introduced into hybrid silica sol-gel/epoxy coating to enhance the mechanical properties of coatings. Titanium dioxide (TiO 2 ) and silica oxide (SiO 2 ) were chemically synthesised before adding to the prepared silica sol gel coating. X-ray diffraction (XRD), Energy-dispersive x-ray analysis (EDX) and Transmission Electron microscope (TEM) were used to characterize the prepared nanoparticles. The coating was then applied to 3003 aluminium alloy (AA3003) surface. The adhesion performance of different sol gel coating compositions was investigated using shear test to define the influence of nanoparticles on adhesive strength of the coating. The Rockwell C hardness test was used to study the micro-hardness of different compositions of sol gel coating. Also, contact angel was used to investigate the hydrophobicity of the coatings. The results showed that there was a significant improvement of the adhesion performance of hybrid silica sol gel coating due to addition of TiO 2 and the hydrophobicity of sol gel coating was increased due to addition of SiO 2 nanoparticles.

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Environmentally compliant silica conversion coatings prepared by sol–gel method for aluminum alloys

Cited by 78 publications

References 16 publications

Deposition and corrosion behavior of silicate conversion coatings on aluminum alloy 2024

Deposition and corrosion behavior of silicate conversion coatings on aluminum alloy 2024

Synthesis and characterization of transparent hydrophobic silica thin films by single step sol–gel process and dip coating

Effects of TiO<sub>2</sub>/SiO<sub>2</sub> Reinforced Nanoparticles on the Mechanical Properties of Green Hybrid Coating

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