Effect of Silica Ratio on the Corrosion Behavior of Nano-silica Potassium Silicate Coatings on Aluminum Alloy 2024

Bahri, H.; Danaee, I.; Rashed, Gholamreza; Zaarei, Davood

doi:10.1007/s11665-014-1325-9

Cited by 17 publications

(13 citation statements)

References 42 publications

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“…It can spontaneously transform from a silanol group (Si-OH) to siloxane bridges (Si-O) by polymerisation reaction, which can provide the ideal bonding strength between silicate and coating surface. The treatment has been successfully utilised for surface sealing of hot dip galvanised (HDG) sheets [24,25], aluminium alloys [26][27][28][29][30][31][32][33], and magnesium alloys [34]. It was shown that the anti-corrosion of coatings sealed with silicate depended mainly on the concentration of silicate.…”

Section: Introductionmentioning

confidence: 99%

Effect of inorganic silicate sealing treatment on corrosion behaviour for HVAF sprayed Fe-based amorphous coatings

Ren

Zhang

et al. 2023

Surface Engineering

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Sealing treatment is an effective, environmentally friendly, and economical coating surface modification technology. To clarify the inorganic silicate sealing mechanism and concentration dependence on corrosion behaviour, HVAF-sprayed Fe-based amorphous metallic coatings (AMCs) were sealed by Na 2 SiO 3 solution with various concentrations, and their microstructure, electrochemical performance, and surface chemistry were characterised in detail. The results showed that Na 2 SiO 3 , in the form of a silicon-oxygen bond (Si-O), could effectively bond with the coating surface inside the pore defects. In addition, the optimal concentration was proved to be 1 mol/L, and the corresponding passivation current density could be reduced to (2.38 ± 0.33) × 10 −6 A/cm 2 , which was an order of magnitude lower than that of as-sprayed coating. This was due to the incomplete filling of the sealant at lower concentrations and the release of water vapour at higher concentrations. This work aims to provide guidance for the practical application of silicate sealing treatment.

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Section: Introductionmentioning

confidence: 99%

Effect of inorganic silicate sealing treatment on corrosion behaviour for HVAF sprayed Fe-based amorphous coatings

Ren

Zhang

et al. 2023

Surface Engineering

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“…The structure of the coating contains polymeric particles such as silanol groups (Si-OH) and siloxane bridge (Si-O-Si) [20]. During the curing process, the polymerization continued and more siloxane groups were converted to siloxane bridges [21]. Dela Cruz et al [22] studied the use of nanosilica and polyaniline (PANI) composites in epoxy coated steel specimens.…”

Section: Introductionmentioning

confidence: 99%

Corrosion Inhibition of Sodium Silicate with Nanosilica as Coating in Pre-Corroded Steel

et al. 2021

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This study was conducted to investigate the potential of using sodium silicate with nanosilica as a treatment to inhibit the progress of corrosion in steel specimens that are already corroded. Steel specimens measuring 16 mm in diameter and 4 mm in thickness were prepared and subjected to pre-corrosion by immersion to 3.5% NaCl solution. Two sets of specimens were then dip-coated with sodium silicate containing nanosilica. One set was coated with 1% nanosilica, and the other was coated with 2.5% nanosilica. The coated specimens were then subjected to Complex Impedance Spectroscopy (CIS) at 20 Hz to 20 MHz frequency range. Compared with the sodium silicate coating with 1% nanosilica, the sodium silicate coating with 2.5% nanosilica had a larger semi-circle curve in the Nyquist plot. Similarly, the sodium silicate coating with 2.5% nanosilica also showed larger magnitudes of impedance at the low-frequency region and larger phase angles at the high-frequency regions in the Bode plot. These results imply that the sodium silicate coating with 2.5% nanosilica coating demonstrated better capacitive behavior. In addition, equivalent circuit modelling results also showed that the sodium silicate coating with 2.5% nanosilica had higher coating resistance and lower coating capacitance as compared to the sodium silicate coating with 1% nanosilica. Doi: 10.28991/cej-2021-03091761 Full Text: PDF

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“…Because of their low toxicity, rare-earth salts are not considered as health hazard materials. Consequently, coatings containing rare-earth elements have been recommended as potential replacements for chromate-based formulations in metal finishing 29,30 . Cerium conversion coatings are one of the most promising environmentally friendly surface treatments for a range of metals [31][32][33] .…”

Section: Introductionmentioning

confidence: 99%

Preparation and Anti-Corrosive Properties of Cerium Oxide Conversion Coatings on Steel X52

2017

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In this study, cerium-based conversion coating was deposited on steel X52 by dip immersion method. Cerium oxide/hydroxide is an environmentally friendly conversion coating. The effects of immersion times and immersion temperatures on corrosion properties of cerium conversion coating on steel X52 were studied. Its corrosion resistance in 3.5 wt.% NaCl solution was investigated by means of electrochemical impedance spectroscopy, potentiodynamic polarization, and surface techniques. The coated samples showed a significant decrease in corrosion rate and corrosion current decreased with increasing immersion time up to 60 s. In addition, electrochemical impedance data showed that in the presence of cerium oxide conversion coatings, the charge transfer resistance of aluminum increased. The experimental results indicated that the corrosion resistance decreased with increasing the operating temperature. Surface morphology and its chemical composition were analyzed by means of scanning electron microscopy and energy dispersive spectroscopy.

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Effect of Silica Ratio on the Corrosion Behavior of Nano-silica Potassium Silicate Coatings on Aluminum Alloy 2024

Cited by 17 publications

References 42 publications

Effect of inorganic silicate sealing treatment on corrosion behaviour for HVAF sprayed Fe-based amorphous coatings

Effect of inorganic silicate sealing treatment on corrosion behaviour for HVAF sprayed Fe-based amorphous coatings

Corrosion Inhibition of Sodium Silicate with Nanosilica as Coating in Pre-Corroded Steel

Preparation and Anti-Corrosive Properties of Cerium Oxide Conversion Coatings on Steel X52

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