A highly controlled fabrication of porous anodic aluminium oxide surface with versatile features by spatial thermo-anodization

Zhang, Zhehui; Sridhar, Sreepathy; Wei, Guoying; Yu, Yundan; Zhang, Zhongquan; Jiang, Li Jun; Yang, Yefeng; Shahzad, Muhammad Wakil; Chen, Xue; Xu, Ben Bin

doi:10.1016/j.surfcoat.2020.126809

Cited by 6 publications

(3 citation statements)

References 51 publications

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“…The preparation methods of thermal control coatings are thermal spray [5,6], cold spray [7,8], sol-gel [9,10], anodic oxidation [11,12], electroless plating [13,14], magnetron sputtering [15,16], etc. Among them, thermal spray and cold spray methods exhibit inadequate thermal performance, while magnetron sputtering entails higher costs.…”

Section: Introductionmentioning

confidence: 99%

Plasma Electrolytic Oxidation Coatings of a 6061 Al Alloy in an Electrolyte with the Addition of K2ZrF6

Chen

Liu

et al. 2023

Materials

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In this study, white thermal control coatings were produced on a 6061 Al alloy using plasma electrolytic oxidation (PEO). The coatings were mainly formed by incorporating K2ZrF6. The phase composition, microstructure, thickness, and roughness of the coatings were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), a surface roughness tester, and an eddy current thickness meter, respectively. The solar absorbance and infrared emissivity of the PEO coatings were measured using a UV–Vis–NIR spectrophotometer and FTIR spectrometer, respectively. The addition of K2ZrF6 to the trisodium phosphate electrolyte was found to significantly enhance the thickness of the white PEO coating on the Al alloy, with the coating thickness increasing in proportion to the concentration of K2ZrF6. Meanwhile, the surface roughness was observed to stabilize at a certain level as the K2ZrF6 concentration increased. At the same time, the addition of K2ZrF6 altered the growth mechanism of the coating. In the absence of K2ZrF6 in the electrolyte, the PEO coating on the Al alloy surface predominantly developed outwards. However, with the introduction of K2ZrF6, the coating’s growth mode transitioned to a combination of outward and inward growth, with the proportion of inward growth progressively increasing in proportion to the concentration of K2ZrF6. The addition of K2ZrF6 substantially enhanced the adhesion of the coating to the substrate and endowed it with exceptional thermal shock resistance, as the inward growth of the coating was facilitated by the presence of K2ZrF6. In addition, the phase composition of the aluminum alloy PEO coating in the electrolyte containing K2ZrF6 was dominated by tetragonal zirconia (t-ZrO2) and monoclinic zirconia (m-ZrO2). With the increase in K2ZrF6 concentration, the L* value of the coating increased from 71.69 to 90.53. Moreover, the coating absorbance α decreased, while the emissivity ε increased. Notably, at a K2ZrF6 concentration of 15 g/L, the coating exhibited the lowest absorbance (0.16) and the highest emissivity (0.72), which are attributed to the enhanced roughness resulting from the substantial increase in coating thickness caused by the addition of K2ZrF6, as well as the presence of ZrO2 with higher emissivity within the coating.

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Section: Introductionmentioning

confidence: 99%

Plasma Electrolytic Oxidation Coatings of a 6061 Al Alloy in an Electrolyte with the Addition of K2ZrF6

Chen

Liu

et al. 2023

Materials

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“… 1 − 4 However, corrosion occurs when all alloy materials are exposed to the atmosphere, seawater, soil, and other media, resulting in equipment damage and huge economic losses. 5 − 9 Al has high electrochemical activity, and Al alloys are easy to be corroded in many application environments, especially in chloride solutions, which seriously restricts their promotion and applications in various fields. 10 , 11 Therefore, how to effectively reduce the surface corrosion of materials has become an important issue in the surface treatment of Al alloy materials.…”

Section: Introductionmentioning

confidence: 99%

“…Aluminum (Al) alloy materials are indispensable in the industrial field due to their high strength, low density, and good processing performance, which are widely used in various fields such as electronic engineering, petrochemical engineering, and aerospace. − However, corrosion occurs when all alloy materials are exposed to the atmosphere, seawater, soil, and other media, resulting in equipment damage and huge economic losses. − Al has high electrochemical activity, and Al alloys are easy to be corroded in many application environments, especially in chloride solutions, which seriously restricts their promotion and applications in various fields. , Therefore, how to effectively reduce the surface corrosion of materials has become an important issue in the surface treatment of Al alloy materials. − …”

Section: Introductionmentioning

confidence: 99%

Laser-Induced Slippery Liquid-Infused Surfaces with Anticorrosion and Wear Resistance Properties on Aluminum Alloy Substrates

Cai

Lian

et al. 2022

ACS Omega

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Slippery liquid-infused surfaces (SLISs) are developed as a potential alternative to superhydrophobic surfaces (SHSs) to resolve the issues of poor durability in corrosion protection and wear resistance. In this work, we used a simple laser processing technology to prepare a SLIS on the aluminum alloy (7075) surface. The superhydrophobicities of the modified surface and the oil film formed by liquid injection make the corrosive medium difficult to directly contact the surface and thus have a significant effect on corrosion resistance. The water and oil repellent SLIS exhibits durable corrosion resistance and excellent tribological properties compared with the SHS. The anticorrosion and wear resistance performances provided by the composite film have been assessed by multiple methods including the electrochemical test, immersion test, and friction wear test. The results indicate that compared to the bare surface, laser-ablated surface (LAS), and fluoroalkyl silane-modified SHS, the SLIS composite coating has better corrosion resistance and wear resistance, which is of great significance to expand the potential applications of 7075 aluminum alloys. The work provides a research basis for expanding the practical application of SLISs in complex environments.

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Optimizing the energy recovery section in thermal desalination systems for improved thermodynamic, economic, and environmental performance

Jamil

Goraya

et al. 2021

International Communications in Heat and Mass Transfer

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A highly controlled fabrication of porous anodic aluminium oxide surface with versatile features by spatial thermo-anodization

Cited by 6 publications

References 51 publications

Plasma Electrolytic Oxidation Coatings of a 6061 Al Alloy in an Electrolyte with the Addition of K2ZrF6

Plasma Electrolytic Oxidation Coatings of a 6061 Al Alloy in an Electrolyte with the Addition of K2ZrF6

Laser-Induced Slippery Liquid-Infused Surfaces with Anticorrosion and Wear Resistance Properties on Aluminum Alloy Substrates

Optimizing the energy recovery section in thermal desalination systems for improved thermodynamic, economic, and environmental performance

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