Plasma electrolytic oxidation coatings on additively manufactured aluminum–silicon alloys with superior tribological performance

Wang, Lili; Wang, Guowei; Dong, Hui; Ye, Minheng; Li, Xiaoyuan; Liu, Ling; Pan, Jinlong; Ye, Zuoyan

doi:10.1016/j.surfcoat.2022.128246

Cited by 26 publications

(6 citation statements)

References 43 publications

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“…This might be connected to the high silicon content and porosity of the treated alloy. In [32] it was reported that in the case of porous materials prepared by additive manufacturing, the alloy, especially near the pores, can be dissolved by the electrolyte, therefore impairing the formation of an oxide layer. A similar potential drop was reported in [23] where an aluminate electrolyte was used.…”

Section: Resultsmentioning

confidence: 99%

Anticorrosive PEO coatings on metallic cast heat enhancers for thermal energy storage

Raźny,

Dmitruk,

Naplocha

2023

Surface Engineering

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The research aims to determine whether a protective oxide coating obtained by plasma electrolytic oxidation (PEO) will prevent unfavourable changes occurring on the surface of aluminium heat enhancers for thermal energy storage (TES) based on phase change materials (PCMs). For domestic purposes (short-term, solar energy), salt hydrates are widely utilised as PCMs. Their low thermal conductivity makes the application of metal enhancers necessary to improve heat transfer in the unit. Due to the chemically aggressive nature of MgCl 2 ·H 2 O, aluminium enhancers can be negatively affected during working cycles. PEO was proposed to overcome corrosion issues in the units. Cast samples, coated with PEO for a short time in KOH-Na 2 SiO 3 electrolyte, were subjected to a molten MgCl 2 ·H 2 O environment. Mass change and the surface were studied via SEM, EDS, and XRD measurements. A thin layer of aluminium oxide prevented castings from changes occurring on the surface of the enhancer.

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Section: Resultsmentioning

confidence: 99%

Anticorrosive PEO coatings on metallic cast heat enhancers for thermal energy storage

Raźny,

Dmitruk,

Naplocha

2023

Surface Engineering

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“…This actively contributes to the formation of the ceramic coating. Consequently, the chemical composition of the treated alloy plays a key role in determining the composition, microstructure, and characteristics of the resulting coating [52,126,127]. Previous investigations have shown that the presence of alloying elements, such as Cu, Mg or Zn in Al alloys, inhibits the transition of γ-Al 2 O 3 to α-Al 2 O 3 [102,128].…”

Section: Substrate Compositionmentioning

confidence: 99%

Plasma Electrolytic Oxidation (PEO) as a Promising Technology for the Development of High-Performance Coatings on Cast Al-Si Alloys: A Review

Fernández-López,

Alves,

San-Jose

et al. 2024

Coatings

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Cast Al-Si alloys, recognized for their excellent mechanical properties, constitute one of the most widely employed non-ferrous substrates in several sectors, and are particularly relevant in the transport industry. Nevertheless, these alloys also display inherent limitations that significantly restrict their use in several applications. Among these limitations, their low hardness, low wear resistance, or limited anti-corrosion properties, which are often not enough when the component is subjected to more severe environments, are particularly relevant. In this context, surface modification and the development of coatings are essential for the application of cast Al-Si alloys. This review focuses on the development of coatings to overcome the complexities associated with improving the performance of cast Al-Si alloys. Against this background, plasma electrolytic oxidation (PEO), an advanced electrochemical treatment that has revolutionized the surface modification of several metallic alloys in recent years, emerges as a promising approach. Despite the growing recognition of PEO technology, the achievement of high-performance coatings on cast Al-Si is still a challenge nowadays, for which reason this review aims to provide an overview of the PEO treatment applied to these alloys. In particular, the impact of the electrolyte chemical composition on the properties of the coatings obtained on different alloys exposed to harsh environments has been analyzed and discussed. By addressing the existing gaps and challenges, this paper contributes to a better understanding of the intricacies associated with the development of robust PEO coatings on cast Al-Si alloys.

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“…Surface finish (roughness) improvement via machining processes can improve the fatigue behaviour of as-built Al alloys by reducing/eliminating the preferential sites for fatigue crack initiation. Coating the surfaces of the as-built Al alloys via processes such as plasma electrolytic oxidation coating can improve the hardness and tribological performance of MAM-produced Al alloys for several applications [130].…”

Section: Post-processing Treatments Of Al Alloysmentioning

confidence: 99%

Post-processing treatments–microstructure–performance interrelationship of metal additive manufactured aerospace alloys: A review

Ojo

Taban

2023

Materials Science and Technology

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The application of Metal Additive Manufacturing (MAM) in the aerospace industry has been gaining attention. The poor surface quality of parts greatly limits the prospects of MAM-produced parts in the aerospace industry as fatigue performance hinges on a good surface finish and homogeneous microstructure. Post-processing treatments are important to improve the surface quality and the overall performance of MAM-produced parts during static and dynamic loadings. This paper provides a review of the current state of post-processing treatment options for MAM-produced parts. The advances in the post-processing treatments of MAM parts to improve fatigue strength, tensile strength, surface integrity and other properties of parts are reviewed. Future research prospects on metal additive manufacturing of aerospace parts are briefly expounded. Abbreviations: AM: Additive Manufacturing; CMT-WAAM: Cold Metal Transfer-Based Wire Arc Additive Manufacturing; CSD: Cold Spray Deposition; DA: Direct Aging; DED: Directed Energy Deposition; E: Elongation; EBAM: Wire-feed Electron Beam Additive Manufacturing; EBAM Electron Beam Additive Manufacturing; EBSD: Electron Back Scattered Diffraction; FRAM: Friction Rolling Additive Manufacturing; FSAM: Friction Stir Additive Manufacturing; FSP: Friction Stir Processing; HFDB: Hybrid Friction Diffusion Bonding; HIP: Hot Isostatic Pressing; HSA Homogenisation + Solution Treatment + Aging; IFSP: Interlayer Friction Stir Processing; IPF: Inverse Pole Figure; KAM: Kernel Average Misorientation; LAM: Laser Additive Manufacturing Process; LENS: Laser Engineered Net Shaping; LDM: Laser Deposition Manufacturing; L-PBF: Laser Powder Bed Fusion; MAM: Metal Additive Manufacturing; MTFS: Multi-track Multi-layer Friction Surfacing; O-WLAM: Wire Oscillating Laser Additive Manufacturing (O-WLAM); S: Solution Treatment; SA: Solution Treatment + aging; TEM: Transmission Electron Microscope; UAM: Ultrasonic Additive Manufacturing; UTS: Ultimate Tensile Strength; WAAM: Wire Arc Additive Manufacturing; YS: Yield Strength

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Plasma electrolytic oxidation coatings on additively manufactured aluminum–silicon alloys with superior tribological performance

Cited by 26 publications

References 43 publications

Anticorrosive PEO coatings on metallic cast heat enhancers for thermal energy storage

Anticorrosive PEO coatings on metallic cast heat enhancers for thermal energy storage

Plasma Electrolytic Oxidation (PEO) as a Promising Technology for the Development of High-Performance Coatings on Cast Al-Si Alloys: A Review

Post-processing treatments–microstructure–performance interrelationship of metal additive manufactured aerospace alloys: A review

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