Facile etching fabrication of superhydrophobic 7055 aluminum alloy surface towards chloride environment anticorrosion

Guo, Fuqiang; Duan, Shuwei; Wu, Dongting; Matsuda, Kenji; Wang, Tao; Zou, Yong

doi:10.1016/j.corsci.2021.109262

Cited by 58 publications

(18 citation statements)

References 61 publications

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“…At the later stage (4-5 d), the R p reaches the maximum value, which indicates that the corrosion products layer is relatively dense, but there is no significant Warburg diffusion. At the same time, it can be seen from Figure 10 that the corrosion layer has a smaller impedance for 4-5 d. The reason for this may be that a certain degree of cracking occurred in the surface corrosion product layer, resulting in the corrosive ions quickly spreading to the matrix [44]. It is basically consistent with the local cracking on the SEM images of the fourth and fifth day (Figure 3j,m…”

Section: Electrochemical Impedance Spectrumsupporting

confidence: 65%

Effect of Corrosion Time on the Synergistic Corrosion of Q235 Steel in Sodium Aluminate Solutions

Quan

Chen

2021

Metals

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During Bayer alumina production with high-sulfur bauxite, the sulfide ions in the sodium aluminate solution caused serious corrosion to Q235 steel, which is the material of the tank equipment. This study investigates the effect of corrosion time on Q235 steel synergistic corrosion in sodium aluminate solution using the weight-loss method and electrochemical measurements. The results indicate that the corrosion rate decreases sharply, the rate equation satisfies the mathematical model of power function at the initial stage of corrosion, and the transformation of unstable iron sulfide to stable iron oxide at the later stage results in the decrease in sulfur content in the corrosion products and surface pseudo-passivation. There are two main types of corrosion products, as follows: one is the octahedral crystal particle, which is composed of Fe2O3, Fe3O4, Al2O3 and NaFeO2, and the other is the interlayer corrosion between the surface layer and the matrix, which is composed of FeS, FeS2 and MnS2. At day 3, the dynamics of the Q235 steel electrode is controlled by charge transfer and ion diffusion. However, at other times the dynamics are mainly controlled by charge transfer.

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Section: Electrochemical Impedance Spectrumsupporting

confidence: 65%

Effect of Corrosion Time on the Synergistic Corrosion of Q235 Steel in Sodium Aluminate Solutions

Quan

Chen

2021

Metals

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“…In recent years, different methods have been reported in the literature to develop superhydrophobic surfaces, such as the spray technique [ 44 , 45 ], electrodeposition [ 46 , 47 ], and chemical etching [ 48 , 49 ]. The latter, which consists of a selective and controlled corrosion process, is one of the most promising methods for its industrial application development, due to its simplicity and low manufacturing costs [ 50 , 51 , 52 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Chemical Surface Texturing on the Superhydrophobic Behavior of Micro–Nano-Roughened AA6082 Surfaces

et al. 2021

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Superhydrophobic surfaces on 6082 aluminum alloy substrates are tailored by low-cost chemical surface treatments coupled to a fluorine-free alkyl-silane coating deposition. In particular, three different surface treatments are investigated: boiling water, HF/HCl, and HNO3/HCl etching. The results show that the micro-nano structure and the wetting behavior are greatly influenced by the applied surface texturing treatment. After silanization, all the textured surfaces exhibit a superhydrophobic behavior. The highest water contact angle (WCA, ≈180°) is obtained by HF/HCl etching. Interestingly, the water sliding angle (WSA) is affected by the anisotropic surface characteristics. Indeed, for the HF/HCl and the HNO3/HCl samples, the WSA in the longitudinal direction is lower than the transversal one, which slightly affects the self-cleaning capacity. The results point out that the superhydrophobic behavior of the aluminum alloys surface can be easily tailored by performing a two-step procedure: (i) roughening treatment and (ii) surface chemical silanization. Considering these promising results, the aim of further studies will be to improve the knowledge and optimize the process parameters in order to tailor a superhydrophobic surface with an effective performance in terms of stability and durability.

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“…Superhydrophobic surfaces have come to be a hot issue and gained remarkably increasing interest from engineers and scientists during the past decades. − These surfaces, with unique structure and function such as large water contact angles (CA > 150°) and little sticking to water drops, have been used to solve many thorny problems, such as corrosion prevention, , anti-icing, antisplashing, self-cleaning, , drag reduction, and so on. Generally speaking, the micro/nanostructure and low-surface-free energy are the key players in the generation of superhydrophobic surfaces. , The chemical etching process is a facile method to fabricate high rough micro/nanoscale structures by the chemical reaction on the metal surface. , Saleema et al designed a one-step technique to fabricate a superhydrophobic surface with CA as high as ∼166° by immersing the AA6061 alloy in NaOH and fluoroalkyl-silane (FAS-17) mixture solution .…”

Section: Introductionmentioning

confidence: 99%

“…Zhang et al declared a method combination of droplet etching and modification to prepare a superhydrophobic Al surface with a CA of 156° . More recently, Guo et al prepared a superhydrophobic 7055-Al alloy surface with a CA of 167.3° using MgCl 2 solution etching and then modified by perfluorooctyltriethoxysilane . The corrosion current density of the superhydrophobic sample dropped by surpass 2 orders than that of immensity of the bare Al sample, and meanwhile, the corrosion inhibition efficiency was 99.67 in 3.5% NaCl solution.…”

Section: Introductionmentioning

confidence: 99%

“…Superhydrophobic surfaces have come to be a hot issue and gained remarkably increasing interest from engineers and scientists during the past decades. 7−11 These surfaces, with unique structure and function such as large water contact angles (CA > 150°) and little sticking to water drops, have been used to solve many thorny problems, such as corrosion prevention, 12,13 anti-icing, 14 antisplashing, 15 self-cleaning, 16,17 drag reduction, 18 and so on. Generally speaking, the micro/ nanostructure and low-surface-free energy are the key players in the generation of superhydrophobic surfaces.…”

Section: Introductionmentioning

confidence: 99%

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Formation and Properties of Superhydrophobic Al Coatings on Steel

Cheng

Wang

et al. 2021

ACS Omega

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Thermal sprayed aluminum coatings are widely scalable to corrosion protection of the offshore steel structure. However, the corrosion rate of the Al coating increases considerably due to the severe marine environment. It has remained a challenge to improve the corrosion resistance and protective ability of Al coatings. The superhydrophobic surface provides a potential way to improve the corrosion resistance of metal materials. Hence, the development of superhydrophobic Al coatings with superior corrosion resistance is of great interest. In this work, the feasibility of the preparation of superhydrophobic Al coatings on a steel substrate was explored. First, Al coatings were prepared onto the steel substrate by the arc-spraying process, followed by ultrasonic etching with 0.1 M NaOH solution, and afterward passivated using 1% fluorosilanes. The effects of the etching time on morphology, contact angle, and corrosion resistance of the Al coatings were evaluated. The schematic model of the fluorosilane passivation process on the Al coating surface was provided. The micro/nanoscale surface structure of the low-surface-energy fluorosilanes promotes the wetting angle of 153.4°and a rolling angle to 6.6°, denoting the superhydrophobic properties. The superhydrophobic Al coating surface displays excellent self-cleaning performance due to its weak adhesion to water droplets. The corrosion current density of the superhydrophobic Al coating (1.36 × 10 −8 A cm −2 ) is 2 orders of magnitude lower than that of the as-sprayed Al coating (1.18 × 10 −6 A cm −2 ). Similarly, the charge-transfer resistance is found to be 12 times larger for the superhydrophobic Al coating and the corresponding corrosion inhibition efficiency reaches 98.9%. The superhydrophobic Al coating displays superior corrosion resistance and promising applications in a marine corrosion environment.

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Facile etching fabrication of superhydrophobic 7055 aluminum alloy surface towards chloride environment anticorrosion

Cited by 58 publications

References 61 publications

Effect of Corrosion Time on the Synergistic Corrosion of Q235 Steel in Sodium Aluminate Solutions

Effect of Corrosion Time on the Synergistic Corrosion of Q235 Steel in Sodium Aluminate Solutions

Effect of Chemical Surface Texturing on the Superhydrophobic Behavior of Micro–Nano-Roughened AA6082 Surfaces

Formation and Properties of Superhydrophobic Al Coatings on Steel

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