Effect of Electrolyte pH on Microstructure, Corrosion Behavior, and Mechanical Behavior of Ni-P-W-TiO2 Electroplated Coatings

Sadeghi, Sajjad; Ebrahimifar, Hadi

doi:10.1007/s11665-021-05462-4

Cited by 6 publications

(5 citation statements)

References 36 publications

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“…In this gure, R s represents the solution resistance, R ct is the charge transfer resistance, CPE dl is a phase element constant that replaces the electrochemical double layer capacitance (C dl ), due to surface roughness, non-uniform distribution of current during the corrosion process and inhomogeneous distribution of reaction rates on the electrode surface [40]. R f and CPE F are the resistance and constant phase element related to the capacitance of the corrosion products lm formed on the Al surface, respectively.…”

Section: Electrochemical Impedance Spectroscopy (Eis)mentioning

confidence: 99%

A Study of the corrosion inhibition of aluminum in ethanol-gasoline blend by using Annona muricata leaves extract

Benitez,

Galvez,

Sesenes

et al. 2024

Preprint

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The effect of Annona muricata leaves extract as an inhibitor of green corrosion of aluminum was investigated 20% cane ethanol and 80% gasoline blend solution for 91 days of immersion. It was evaluated using gravimetric and electrochemical techniques such as electrochemical impedance spectroscopy (EIS), linear polarization resistance (LPR) and electrochemical noise (EN). The studies revealed that Annona muricata extract is an efficient corrosion inhibitor, reaching its highest efficiency at concentrations of 20 and 25 ppm. This decrease in the corrosion rate is because the inhibitor adsorbs to the aluminum surface by physisorption according to the Langmuir adsorption isotherm and demonstrated a more notable protective effect Fourier transform infrared spectroscopy (FTIR) and gas chromatography coupled with mass spectrometry (GC-MS) analyzes were performed, which showed the presence of phenolic compounds, lauric acid, palmitic acid, linoleic acid, vitamin E and other compounds with antioxidant properties. The morphology of the aluminum surface was examined by scanning electron microscopy (SEM), showing the existence of a protective layer of Annona muricata extract that reduces pitting corrosion susceptibility of aluminum.

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Section: Electrochemical Impedance Spectroscopy (Eis)mentioning

confidence: 99%

A Study of the corrosion inhibition of aluminum in ethanol-gasoline blend by using Annona muricata leaves extract

Benitez,

Galvez,

Sesenes

et al. 2024

Preprint

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show abstract

“…Similarly, the restricted material transport during corrosion, due to limited diffusion within the pore channels, can also result in discrepancies in coating performance. The corrosion performances of coatings are well known to vary with changes in the corroding environment [53,54]. The limited material transport within the pore channels during corrosion can lead to the accumulation of corrosion by-products and local variation of pH, resulting in the alteration of the localised environment affecting the corrosion protection effectiveness of the coating, especially within the channels of the porous Mg-Zn-Zr scaffold.…”

Section: Limited Diffusion Within the Pore Channel During The Coating...mentioning

confidence: 99%

Surface Modification with Phosphate and Hydroxyapatite of Porous Magnesium Scaffolds Fabricated by Binder Jet Additive Manufacturing

et al. 2022

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The presence of porosity within magnesium-based orthopaedic implants is known to be beneficial, promoting cell proliferation and vascularisation. However, the presence of porosity increases the surface area available for corrosion, compounding the issue of high corrosion rates which has long been plaguing magnesium-based materials. This work looks at the influence of hydroxyapatite and phosphate conversion coatings on the corrosion performance of conventionally cast, dense Mg-Zn-Zr alloys and binder jet additive manufactured porous Mg-Zn-Zr scaffolds. The performance of coating on dense Mg-Zn-Zr was found to be more effective than the coating on the porous Mg-Zn-Zr scaffold, with the discrepancies attributed to both the microstructure and geometric influence of the binder jet additive manufactured, porous Mg-Zn-Zr scaffold, which not only increases the rate of hydrogen evolution but also reduces the ability of the hydrogen gas generated within the pore channels to escape to the sample’s surface. This restricts the effectiveness of coating application for porous Mg scaffold. Furthermore, the limited diffusion within the pore channels can also result in differing localized corrosion environments, causing discrepancies between the localised corrosion environment within the pore channels and that at the bulk electrolyte.

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“…The design of lightweight structural alloys relies on inclusion of precipitates to achieve the desired load-bearing properties; the heterogeneous composition of such alloys underpins a strong proclivity for galvanic corrosion as a result of the creation of localized anodic and cathodic sites [15][16][17][18][19][20] . The corrosion properties of such alloys can be understood considering Pourbaix diagrams of the light-metal components of the alloys as a starting point 15,21,22 . Strengthening and passivating additives have a deleterious effect on corrosion properties by shrinking passivation windows of alloys as compared to the pure metals 17,19,[21][22][23] .…”

Section: Introductionmentioning

confidence: 99%

“…The corrosion properties of such alloys can be understood considering Pourbaix diagrams of the light-metal components of the alloys as a starting point 15,21,22 . Strengthening and passivating additives have a deleterious effect on corrosion properties by shrinking passivation windows of alloys as compared to the pure metals 17,19,[21][22][23] .…”

Section: Introductionmentioning

confidence: 99%

Mechanistic origins of corrosion protection of aluminum alloys by graphene/polyetherimide nanocomposite coatings

et al. 2023

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Light-weighting vehicular components through adoption of light-metal structural alloys holds promise for reducing the fuel consumption of internal combustion engine vehicles and increasing the range of battery electric vehicles. However, the alloyed microstructure and surface precipitates of aluminum alloys render these materials susceptible to corrosion under modest excursions from neutral pH. Traditional chromium-based anodic passivation layers are subject to increasingly stringent environmental regulations, whereas options for sacrificial cathodic films are sparse for electropositive metals. While hybrid nanocomposite coatings have shown initial promise, mechanistic underpinnings remain poorly understood. Here, a fully imidized polyetherimide (PEI) resin is utilized as the continuous phase with inclusion of unfunctionalized exfoliated graphite (UFG). A comprehensive investigation of the mechanisms of corrosion protection reveals key fundamental design principles underpinning corrosion inhibition. First, strong interfacial adhesion, which for PEI is facilitated by binding of imide carbonyl moieties to Lewis acidic sites on Al surfaces. Second, the miscibility of ion-impervious nanoscopic UFG fillers and stabilization of a substantial interphase region at UFG/PEI boundaries that result in minimizing the free volume at the filler/polymer interface. Finally, extended tortuosity of ion diffusion pathways imbued by the below-percolation-threshold 2D fillers. These three design principles help govern and modulate ion transport from electrolyte/coating interfaces to the coating/metal interface and are crucial for the extended preservation of barrier properties. The results suggest an approach to systematically activate multiple modes of corrosion inhibition through rational design of hybrid nanocomposite coatings across hard-to-abate sectors where light metal alloys are likely to play an increasingly prominent role.

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Effect of Electrolyte pH on Microstructure, Corrosion Behavior, and Mechanical Behavior of Ni-P-W-TiO2 Electroplated Coatings

Cited by 6 publications

References 36 publications

A Study of the corrosion inhibition of aluminum in ethanol-gasoline blend by using Annona muricata leaves extract

A Study of the corrosion inhibition of aluminum in ethanol-gasoline blend by using Annona muricata leaves extract

Surface Modification with Phosphate and Hydroxyapatite of Porous Magnesium Scaffolds Fabricated by Binder Jet Additive Manufacturing

Mechanistic origins of corrosion protection of aluminum alloys by graphene/polyetherimide nanocomposite coatings

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