Edge protection improvement of automotive electrocoatings in the presence of silica nanoparticles

Bakhtiary-Noodeh, Marzieh; Moradian, Siamak; Ranjbar, Zahra

doi:10.1016/j.surfcoat.2017.03.004

Cited by 10 publications

(5 citation statements)

References 26 publications

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“…This phenomenon is due to two mechanisms: (1) the coatings' hydrophobicity repels water molecules from its surface and (2) MWCNT nanoparticles fill the pores or spaces left by the crosslinking of polymer chains, preventing the penetration of corrosion media such as water [35]. Alternatively, silica nanoparticles are rheological modifiers, which increase the coating's viscosity, and as a result, prevent the flow around sharp corners [36]. This increases the stability and thickness of the coatings on the metal surfaces, therefore enhancing corrosion protection.…”

Section: Introductionmentioning

confidence: 99%

“…This increases the stability and thickness of the coatings on the metal surfaces, therefore enhancing corrosion protection. Bakhtiary-Noodeh et al [36] studied the effect of hydrophilic nanosilica in a commercial waterborne automotive electrocoat (BASF) coating on steel. It was found that at an optimal loading of silica (up to 6%), the anti-corrosion effect was enhanced; however, at a loading of 8%, it drastically decreased [36].…”

Section: Introductionmentioning

confidence: 99%

“…Bakhtiary-Noodeh et al [36] studied the effect of hydrophilic nanosilica in a commercial waterborne automotive electrocoat (BASF) coating on steel. It was found that at an optimal loading of silica (up to 6%), the anti-corrosion effect was enhanced; however, at a loading of 8%, it drastically decreased [36]. It is understood that the presence of MWCNTs and nanosilica increases the barrier resistance due to better packing, making the path for corrosive electrolytes lengthier and complex.…”

Section: Introductionmentioning

confidence: 99%

“…It is understood that the presence of MWCNTs and nanosilica increases the barrier resistance due to better packing, making the path for corrosive electrolytes lengthier and complex. Nevertheless, at high percentage, there could be inappropriate dispersion, leading to a loss of resistivity of the coating or lack of adhesion to the metal surface [36,37].…”

Section: Introductionmentioning

confidence: 99%

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Nonporous, Strong, Stretchable, and Transparent Electrospun Aromatic Polyurea Nanocomposites as Potential Anticorrosion Coating Films

et al. 2021

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This study, for the first time, focused on the fabrication of nonporous polyurea thin films (~200 microns) using the electrospinning method as a novel approach for coating applications. Multi-walled carbon nanotubes (MWCNTs) and hydrophilic-fumed nanosilica (HFNS) were added separately into electrospun polyurea films as nano-reinforcing fillers for the enhancement of properties. Neat polyurea films demonstrated a tensile strength of 14 MPa with an elongation of 360%. At a loading of 0.2% of MWCNTs, the highest tensile strength of 21 MPa and elongation of 402% were obtained, while the water contact angle remained almost unchanged (89°). Surface morphology analysis indicated that the production of polyurea fibers during electrospinning bonded together upon curing, leading to a nonporous film. Neat polyurea exhibited high thermal resistance with a degradation temperature of 380 °C. Upon reinforcement with 0.2% of MWCNTs and 0.4% of HFNS, it increased by ~7 °C. The storage modulus increased by 42 MPa with the addition of 0.2% of MWCNTs, implying a superior viscoelasticity of polyurea nanocomposite films. The results were benchmarked with anti-corrosive polymer coatings from the literature, revealing that the production of nonporous polyurea coatings with robust strength, elasticity, and thermal properties was achieved. Electrospun polyurea coatings are promising candidates as flexible anti-corrosive coatings for heat exchanges and electrical wires.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Nonporous, Strong, Stretchable, and Transparent Electrospun Aromatic Polyurea Nanocomposites as Potential Anticorrosion Coating Films

et al. 2021

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“…Nearly every automobile in the world is primed using cathodic electrophoretic deposition of a polymeric resin. 1,2 This process is generally termed electrocoating. During automotive electrocoating, a non-uniform current distribution results from the complex geometries of automobile bodies.…”

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confidence: 99%

Effect of Convection on Initial Deposition during Electrocoating of Galvanized Steel

Marlar

Trainor

Liu

et al. 2020

J. Electrochem. Soc.

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The objective of this work is to advance the mechanistic understanding of cathodic electrocoating. These efforts focus on the initial processes responsible for deposition, which are examined through direct experimentation and simulation. Electrocoating is a global industrial process providing a corrosion-resistant, base-paint layer to automobile bodies. Presently, empirical models are used to model coating thickness; these models tend to overpredict deposition in occluded areas. Convection is implemented to study electrochemical mechanisms at the surface of the coated part. The impact of surface H 2 bubbles and early e-coat deposition on the local current density is studied using current distribution simulations. Results show an increase in current density locally around surface H 2 bubbles and early e-coat deposition influences film growth. When surface H 2 bubbles are displaced by convection before sufficient e-coat is deposited, deposition is slowed under lower local current density. However, when the e-coat covers sufficient surface area, and convection is then applied, the induction period is unaffected, implying the early deposition is sufficient to keep the local current density high enough to drive deposition. These results provide an increased understanding of fundamental processes responsible for e-coat deposition, which is the foundation needed for advanced physics-based models of the electrocoating process.

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Electrophoretic deposition of waterborne colloidal dispersions

Ranjbar

Bakhtiary-Noodeh

2020

Handbook of Waterborne Coatings

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Edge protection improvement of automotive electrocoatings in the presence of silica nanoparticles

Cited by 10 publications

References 26 publications

Nonporous, Strong, Stretchable, and Transparent Electrospun Aromatic Polyurea Nanocomposites as Potential Anticorrosion Coating Films

Nonporous, Strong, Stretchable, and Transparent Electrospun Aromatic Polyurea Nanocomposites as Potential Anticorrosion Coating Films

Effect of Convection on Initial Deposition during Electrocoating of Galvanized Steel

Electrophoretic deposition of waterborne colloidal dispersions

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