Anti-corrosion enhancement of superhydrophobic coating utilizing oxygen vacancy modified potassium titanate whisker

Li, Yuan; Zhang, Xiguang; Cui, Yexiang; Wang, Huaiyuan; Wang, Jixiao

doi:10.1016/j.cej.2019.06.028

Cited by 83 publications

(25 citation statements)

References 52 publications

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“…Although chemical modification approaches effectively reduce corrosion, they have several critical issues that can cause loss of anticorrosion performance. These issues need to be considered while formulating the main functionality of protection against corrosion, such as adhesion to surfaces due to the presence of interface, layer thickness, mechanical durability, presence of micro-defects and chemical complexity in coatings [42][43][44]; non-uniform thickness, brittleness and cracking in plating [45]; the presence of volatile organic compounds in paints [44]; and most inhibitors are hazardous and expensive [46]. Micropatterns are environmentally friendly and can be implemented over large surface areas.…”

Section: Advantages Of Topographical Modificationmentioning

confidence: 99%

Anticorrosion Behaviour of SS304 Microgroove Surfaces in Saline Water

Annakodi¹,

Singh

Jayalakshmi

et al. 2021

Metals

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The 304 Stainless Steel (SS304) is severely affected by salt water corrosion due to its high surface wettability. By reducing its surface wettability, its corrosion can be reduced. To achieve this, topographical modification of the steel surface is an effective route. In this work, SS304 flat surfaces were topographically modified into microgrooves (ridge width 250 μm to 500 μm, groove width 200 μm, width ratio = ridge width/groove width >1). Wire cut electrical discharge machining was used to fabricate the microgrooves. Long-term wetting characteristics and long-term corrosion behaviour of flat surface and microgrooves were studied. The influence of the nature of wetting of the tested surfaces on their corrosion behaviour was examined. The sessile drop method and potentiodynamic polarization tests in sodium chloride (3.5 wt. % NaCl) solution (intermittent and continuous exposures for 168 h) were studied to characterize their wetting and corrosion behaviours, respectively. Topographical modification imparted long-term hydrophobicity and, as a consequence, long-term anticorrosion ability of the steel surface. Micropatterning reduced the corrosion rate by two orders of magnitude due to reduction in interfacial contact area with the corrosive fluid via composite wetting, i.e., solid–liquid–air interface. Microgrooves showed corrosion inhibition efficiency ³88%, upon long-term exposure to NaCl solution. By comparing the wetting and corrosion behaviours of the microgrooves with those of the previously studied microgrooves (ridge width/groove width <1), it was found that the surface roughness of their ridges strongly influences their wetting and corrosion properties.

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Section: Advantages Of Topographical Modificationmentioning

confidence: 99%

Anticorrosion Behaviour of SS304 Microgroove Surfaces in Saline Water

Annakodi¹,

Singh

Jayalakshmi

et al. 2021

Metals

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“…The impedance modulus of bare AZ31 is around 260 Ω cm 2 (10 Hz), and presents a decline trend after this highest value with a positive phase shift at the same time, which shows the inductive behavior of bare AZ31, and this inductive behavior indicates the poor corrosion resistance. [44] As seen from the Figure 9, j Z j 0.01Hz of Sample 3 reaches 5.51 × 10 6 Ω cm 2 . It is well accepted that larger impedance modulus at the low-frequency domain is an indication of better corrosion protection performance because the coating layer separates the vulnerable metal substrate from corrosive species.…”

Section: Corrosion Protection Of Superhydrophobic Coatingsmentioning

confidence: 78%

“…For Cassie state, water belongs to the lightdense medium relative to the gas phase in the rough structure at the interface, so the liquid-gas interface meets the total light reflection condition under specific conditions, and the reflected light at the interface is relatively bright. [44][45][46] Figure 12a presents the existing state of superhydrophobic coating immersed in water. Viewed from the side, the surface of the superhydrophobic coating immersed in water is unusually bright, which indicates that air can be trapped in the rough surface of the superhydrophobic coating according to the total reflection theory.…”

Section: Corrosion Protection Mechanism Of Superhydrophobic Coatingmentioning

confidence: 99%

Superhydrophobic Silane/Fluorinated Attapulgite@SiO₂ Composite Coatings on Magnesium Alloy for Corrosion Protection

Wang

Zhang

et al. 2020

ChemistrySelect

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To improve the corrosion resistance of magnesium alloys, superhydrophobic coatings were prepared by employing fluorinated attapulgite@SiO2 (F‐ATP@SiO2) particles and silanes via a facile one‐step spraying technique in this study. Surface morphology, chemical compositions, roughness and wettability of the coatings were comprehensively investigated by Field emission scanning electron microscopy (FESEM), Fourier transform infrared spectra (FTIR), 3D optical microscope and contact angle techniques, respectively. Corrosion resistance of the coatings was evaluated by potentiodynamic polarization test and electrochemical impedance spectroscopy (EIS). Results indicated that the coatings exhibited superhydrophobicity due to its micron scale mastoid structure and low surface energy of F‐ATP@SiO2 particles. The superhydrophobicity and anticorrosion performance of the coatings increased with the dosage increase of F‐ATP@SiO2 particles. The water contact angle of the prepared surface can reach as high as 161° with sliding angle of 4°. Icorr of the coatings can reach 5.519×10−8 A cm−2, decreased by 3 orders of magnitude compared to bare AZ31, which showed excellent anticorrosion performance. With the prolongation of immersion time, the EIS analysis indicated that the anticorrosion property of the coating degraded gradually. Based on the electrochemical analysis, the corrosion protection mechanism of the superhydrophobic coating was proposed.

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“…This is further confirmed by the third peak at 2844 cm −1 , which is considered as another character for carbon in graphite state [55] . By and large, the calcination of coordination polymer built by nitrogen heterocycle ligand often generates metal oxide with oxygen vacancy, whose existence can be proved by electron paramagnetic resonance spectrum (EPR) [56] . In our sample derived from CoCP, an obvious signal emerges at g = 2.003 ( Fig.…”

Section: Structure and Morphology Of O-co 3 O 4 @Mcnmentioning

confidence: 99%

Hybrid battery integrated by Zn-air and Zn-Co3O4 batteries at cell level

Liu

et al. 2020

Journal of Energy Chemistry

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Anti-corrosion enhancement of superhydrophobic coating utilizing oxygen vacancy modified potassium titanate whisker

Cited by 83 publications

References 52 publications

Anticorrosion Behaviour of SS304 Microgroove Surfaces in Saline Water

Anticorrosion Behaviour of SS304 Microgroove Surfaces in Saline Water

Superhydrophobic Silane/Fluorinated Attapulgite@SiO₂ Composite Coatings on Magnesium Alloy for Corrosion Protection

Hybrid battery integrated by Zn-air and Zn-Co3O4 batteries at cell level

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Anti-corrosion enhancement of superhydrophobic coating utilizing oxygen vacancy modified potassium titanate whisker

Cited by 83 publications

References 52 publications

Anticorrosion Behaviour of SS304 Microgroove Surfaces in Saline Water

Anticorrosion Behaviour of SS304 Microgroove Surfaces in Saline Water

Superhydrophobic Silane/Fluorinated Attapulgite@SiO2 Composite Coatings on Magnesium Alloy for Corrosion Protection

Hybrid battery integrated by Zn-air and Zn-Co3O4 batteries at cell level

Contact Info

Product

Resources

About

Superhydrophobic Silane/Fluorinated Attapulgite@SiO₂ Composite Coatings on Magnesium Alloy for Corrosion Protection