Sol–gel preparation and corrosion properties of Zn–SiO2 nanocomposite thin film

Razavizadeh, O.; Ghorbani, Mohammad

doi:10.1007/s10971-016-4016-1

Cited by 7 publications

(4 citation statements)

References 9 publications

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“…33 The corrosion properties of 'higher abrasion resistant' sol-gel Zn-SiO 2 thin films have previously been characterized using electrochemical impedance spectroscopy (EIS). 34 The films were shown to behave differently to conventional sacrificial Zn based coatings (such as HDG), and any enhanced corrosion protection was proposed to be a result the tendency of Zn to react with Clions to form ZnCl 2 and meant that the coatings were deemed suitable for use in marine environments. The question of whether Zn sol-gel coatings are able to provide sacrificial protection to a steel substrate therefore remains largely unanswered.…”

Section: Introductionmentioning

confidence: 99%

“…The question of whether Zn sol-gel coatings are able to provide sacrificial protection to a steel substrate therefore remains largely unanswered. 34 The success of an active coating can be characterised by the distance over which the system is able to protect a coating defect (throwing power), as well as the time before coating failure. The barrier properties of the 'binder' material, alongside the anode/cathode area ratio and geometry also play a role in influencing the galvanic protection offered by such coatings.…”

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confidence: 99%

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The Sacrificial Protection of Steel by Zinc-Containing Sol-Gel Coatings

Wint

Wijesinghe

Yan

et al. 2019

J. Electrochem. Soc.

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The scanning vibrating electrode technique (SVET), electrochemical impedance spectroscopy, and salt spray testing are used to investigate the ability of Zn rich sol-gel coatings to provide sacrificial protection to carbon steel. Three types of coatings (containing either Zn powder, a coloured pigment, or both) are applied to steel. Intact coatings are shown to act as barrier layers through which electrolyte ingresses over time.Under conditions where the substrate is exposed by an artificial coating defect, SVET is used to investigate the extent to which different coatings offer sacrificial protection when the defect size is systematically changed. The total anodic current, as derived using SVET, doubles when the defect covers 25 % of the total area compared to when 12 % of the area is exposed. This finding is consistent with efficient sacrificial protection of the steel by the zinc based coating. This sacrificial protection is observed for up to 24 hours for cases where the defect constitutes up to 52 % of total area. The protection offered in the presence of a coloured pigment is delayed and it is proposed that the pigment restricts the ability of Zn to couple with the underlying steel.

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Section: Introductionmentioning

confidence: 99%

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confidence: 99%

The Sacrificial Protection of Steel by Zinc-Containing Sol-Gel Coatings

Wint

Wijesinghe

Yan

et al. 2019

J. Electrochem. Soc.

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show abstract

“…This is because DLS tests are usually performed under solution conditions, but samples are kept dry when performing SEM and TEM tests, which may cause a small shrinkage of the particles and then a decrease in the NC size. 30,31 Zeta potential is an important factor for determining the stability of the colloidal dispersion system, and the stability of the dispersion system is proportional to the absolute value of the zeta potential. 32 Fig.…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%