SVET method for characterizing anti-corrosion performance of metal-rich coatings

Mao, Yan; Gelling, Victoria J.; Hinderliter, Brian; Battocchi, Dante; Tallman, Dennis E.; Bierwagen, Gordon P.

doi:10.1016/j.corsci.2010.04.012

Cited by 80 publications

(41 citation statements)

References 28 publications

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“…Basic aspect of the protection relies on intense sacrificial action of the metallic pigments such as zinc, aluminum, magnesium, ensuring stable immunization of steel 1–3 and aluminum alloys 4. As prominent members of such coatings, galvanic function of the liquid ZRPs was studied to reveal relationship between the sum of anodic currents and open circuit potentials (OCPs) 5. Besides diminishing galvanic function, ZRPs afford passive protection based on accumulation of pore‐filling corrosion products.…”

Section: Introductionmentioning

confidence: 99%

Novel zinc‐rich epoxy paint coatings with hydrated alumina and carbon nanotubes supported polypyrrole for corrosion protection of low carbon steel: Part II: Corrosion prevention behavior of the hybrid paint coatings

Gergely

Pászti

Bertóti

et al. 2012

Materials & Corrosion

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Utilization of various types of multi‐walled carbon nanotubes (MWCNTs) in zinc‐rich paints (ZRPs) is presented addressing percolation and porosity related phenomena of traditional ZRPs. Hybrid paint coatings were formulated with 3.21 wt% polypyrrole (PPy) deposited alumina‐MWCNT inhibitor particles (PDAMIPs) and 70 wt% zinc contents. Corrosion protection behavior of the hybrid coatings was investigated by electrochemical impedance spectroscopy (EIS), glow‐discharge optical emission spectroscopy (GD OES), X‐ray photoelectron spectroscopy (XPS), and FT‐Raman spectroscopy. Immersion and salt‐spray chamber tests gave evidence of improved galvanic protection and barrier nature of the hybrid coatings over the conventional ZRPs, whereas inhibited zinc corrosion and ignorable steel corrosion took place besides lower degradation of the binder. Zinc‐rich hybrid paints with either high relative amount of polyelectrolyte‐modified or low proportion of functionalized MWCNTs afforded enhanced corrosion prevention. This result is partly attributed to the nanotube volume fractions around the threshold of infinite cluster formation contributing to electrical percolation and galvanic action of the hybrids. Experimental results are discussed in a broader context on the basis of structure related findings of the PDAMIPs (described in Part I) and in the light of recent literature data. From the newly developed inhibitor particles, some of them are respected as worthy additives for application in hybrid coatings featuring high performance corrosion prevention functionality.

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Section: Introductionmentioning

confidence: 99%

Novel zinc‐rich epoxy paint coatings with hydrated alumina and carbon nanotubes supported polypyrrole for corrosion protection of low carbon steel: Part II: Corrosion prevention behavior of the hybrid paint coatings

Gergely

Pászti

Bertóti

et al. 2012

Materials & Corrosion

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“…111 Because CNTs facilitate electrical connection of zinc and the steel substrate, nano-and mesoscopic galvanic cells form from certain particle content. 111 Because CNTs facilitate electrical connection of zinc and the steel substrate, nano-and mesoscopic galvanic cells form from certain particle content.…”

Section: Hybrid Zinc-rich Paint Coatings 241mentioning

confidence: 99%

Hybrid Zinc-Rich Paint Coatings

Gergely

Pászti

Bertóti

et al. 2015

Intelligent Coatings for Corrosion Control

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“…Although this problematic is apparent, it is often neglected and not given enough attention. For instance, in most corrosion related studies involving SVET measurements authors do not explain the precautions taken to prevent or limit the evaporation of the test electrolyte during long‐term SVET measurements .…”

Section: Introductionmentioning

confidence: 99%

Evaporation of Electrolyte during SVET Measurements: The Scale of the Problem and the Solutions

et al. 2019

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The objective of this work is to investigate the scale of the effect of spontaneous solution evaporation during SVET (Scanning Vibrating Electrode Technique) measurements and demonstrate how it biases the final results. When SVET maps are continuously acquired for more than several hours, the measured currents are smaller than expected. This is attributed to solvent (typically water) evaporation which leads to an increase in solution conductivity over time. If this is not considered when converting the measured potential differences into the local current densities, the SVET results display currents smaller than the true ones. Here, this effect is studied with a platinum disk electrode as source of a constant current and a model corroding system consisting of the AA2024/CFRP galvanic couple. Corrective actions are proposed to mitigate the problem, either in the experimental set‐up or as numerical correction.

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SVET method for characterizing anti-corrosion performance of metal-rich coatings

Cited by 80 publications

References 28 publications

Novel zinc‐rich epoxy paint coatings with hydrated alumina and carbon nanotubes supported polypyrrole for corrosion protection of low carbon steel: Part II: Corrosion prevention behavior of the hybrid paint coatings

Novel zinc‐rich epoxy paint coatings with hydrated alumina and carbon nanotubes supported polypyrrole for corrosion protection of low carbon steel: Part II: Corrosion prevention behavior of the hybrid paint coatings

Hybrid Zinc-Rich Paint Coatings

Evaporation of Electrolyte during SVET Measurements: The Scale of the Problem and the Solutions

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