Ceria/stannate multilayer coatings on AZ91D Mg alloy

Bagalà, P.; Lamastra, Francesca Romana; Kačiulis, S.; Mezzi, A.; Montesperelli, Giampiero

doi:10.1016/j.surfcoat.2012.05.075

Cited by 23 publications

(11 citation statements)

References 39 publications

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“…It is well known that the EIS spectrum of a coated sample is given by the contribution of coating properties (Coating Capacitance C coat and Pores Resistance R pore ) in the high frequency region (HF) and faradaic processes (Charge Transfer Resistance R ct and Double Layer Capacitance C dl ) in the low frequency region . In this research, the coating thickness is not an issue, but the impedance of the coating is the figure of merit.…”

Section: Resultsmentioning

confidence: 92%

“…The coated Al‐6082 showed an initial high impedance of about 27 kΩ after 24 h of immersion. At this stage the water adsorption process begins, and the value of the coating capacitance increases with the uptake of water into the coating . However, after 270 h of immersion, a significant corrosion resistance of about 26 kΩ was recorded whereas it was only 3.8 kΩ for the bare sample.…”

Section: Resultsmentioning

confidence: 99%

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Electrospun polymeric coatings on aluminum alloy as a straightforward approach for corrosion protection

Firouzi

Gaudio

Lamastra

et al. 2014

J of Applied Polymer Sci

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Several metals and alloys are susceptible to corrosion attack and this usually implies the accurate selection of a specific material depending on the working conditions and the characteristics of the environment to which it will be exposed to. However, it could represent a restriction at the same time because a limited range of materials can be practically considered. In addition, they could be also characterized by unsuitable properties for the intended application and high costs. To address this issue, polymeric coatings exhibit high potentiality to be a valid alternative to toxic chromates, allowing to deal with the most appropriate metallic materials and affordable deposition procedures. In this work, polyvinyl alcohol (PVA) fibrous coating was successfully collected onto aluminum alloy-6082 by means of electrospinning technique. The anticorrosion performance of the final system has been evaluated in 3 wt % NaCl solution by means of electrochemical impedance spectroscopy (EIS). To avoid PVA disintegration in aqueous environment, several crosslinking procedures were assessed using glyoxal. The two most promising ones (120°C for 60 min and 150°C for 15 min) were then considered for a further investigation. Crosslinked PVA mats showed improved properties as compared to the as-spun case, as demonstrated by mechanical and thermal analyses. Electrochemical tests revealed that crosslinked coatings can protect aluminum substrates against corrosion, especially for the electrospun PVA coating treated at 120°C. In this case, after 270 h, a significant corrosion resistance of about 26 kΩ was recorded with respect to the blank alloy (about 3.8 kΩ)

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Section: Resultsmentioning

confidence: 92%

Section: Resultsmentioning

confidence: 99%

Electrospun polymeric coatings on aluminum alloy as a straightforward approach for corrosion protection

Firouzi

Gaudio

Lamastra

et al. 2014

J of Applied Polymer Sci

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“…Acquired data can be evaluated through an equivalent circuit whose electrical response is representative of the electrochemical behavior of the substrate‐coating system. It is well known that the EIS spectrum of a coated sample is given by the contribution of coating properties (coating capacitance C coat and pore resistance R pore ) in the high frequency region and faradaic processes (charge transfer resistance R ct and double layer capacitance C dl ) in the low frequency region . In this work, the coating thickness is not an issue, but the impedance of the coating is the figure of merit.…”

Section: Resultsmentioning

confidence: 96%

“…For quantitative estimation of the anticorrosion performance of the coating systems in 3 wt % NaCl solution, experimental data were fitted using equivalent circuit models as shown in Figure . For intact coatings (S1–S4), the classical equivalent circuit, presented in Figure (a), was selected . This model was established considering the following characteristics: R sol characterized the solution resistance, CPE coat and R pore referred to the capacitance and resistance of the electrospun fibrous coating, while R ct in parallel with CPE dl represented the charge transfer resistance and double layer capacitance originated from faradaic process present at the substrate/coating interface.…”

Section: Resultsmentioning

confidence: 99%

“…This model was established considering the following characteristics: R sol characterized the solution resistance, CPE coat and R pore referred to the capacitance and resistance of the electrospun fibrous coating, while R ct in parallel with CPE dl represented the charge transfer resistance and double layer capacitance originated from faradaic process present at the substrate/coating interface. Here, the constant phase elements (CPE) have been used instead of a real capacitance to take into account the nonideal behavior of the sample resulting from nonuniformity of the coatings …”

Section: Resultsmentioning

confidence: 99%

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Electrospun protective self‐healing coatings for light alloys: A better understanding of the intrinsic potential of the technology

Firouzi

Impagnatiello

Gaudio

et al. 2015

J of Applied Polymer Sci

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Polymeric coating systems exhibit high potentiality to provide an effective barrier against corrosion of metallic surfaces. However, these coatings can lose their protective characteristics because of their high susceptibility to damage. Thus, the addition of corrosion inhibitors is desirable and considered as an alternative route for active corrosion protection. In the present work, ecofriendly electrospun coatings of poly(vinyl alcohol) (PVA) loaded with cerium salts have been deposited onto aluminium 6082 alloy. Two different precursors of cerium (III) (i.e., cerium nitrate and cerium acetylacetonate) were added to the electrospinning solutions and the effectiveness of the resulting nanofibrous coatings was evaluated for the healing of generated defects. The microstructural features of the electrospun coatings have been investigated by scanning electron microscopy, infraredspectroscopy, and thermal analysis. Tensile tests were performed to assess the mechanical properties of the different fibrous coatings. The electrochemical behavior of both intact and damaged coatings was evaluated in 3 wt % NaCl solution by means of electrochemical impedance spectroscopy. All the deposited PVA coatings loaded with cerium(III) salts showed remarkable corrosion resistance. In the case of artificially damaged coatings, a self-healing effect, which stops the development of the corrosion process and provides a significant recovery of the corrosion resistance, has been observed only for coatings loaded with cerium III acetylacetonate. The release of cerium from damaged PVA fibers has been demonstrated by means of inductively coupled plasma mass spectrometry. The observed self-healing effect has been ascribed to the formation of cerium hydroxide on the defective zone, which hindered the corrosion process.

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Synthesis and Characterization of AZ91 Magnesium Alloy‐Alumina/Ceria Composite Coating By Thermal Spray Technique

Adarsha,

Pattanaik,

Sharma

et al. 2024

Evolutionary Manufacturing, Design and Operational Practices for Resource and Environmental Sustainability

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Ceria/stannate multilayer coatings on AZ91D Mg alloy

Cited by 23 publications

References 39 publications

Electrospun polymeric coatings on aluminum alloy as a straightforward approach for corrosion protection

Electrospun polymeric coatings on aluminum alloy as a straightforward approach for corrosion protection

Electrospun protective self‐healing coatings for light alloys: A better understanding of the intrinsic potential of the technology

Synthesis and Characterization of AZ91 Magnesium Alloy‐Alumina/Ceria Composite Coating By Thermal Spray Technique

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