A high-corrosion-resistant high-entropy alloys (HEAs) coatings with single BCC solid solution structure by laser remelting

Zhang, Peng; Xu, Zhou; Yao, Zhongping; Liu, Yanyan; Lin, Shouyuan; He, Mingyu; Lu, Songtao; Wu, Xiaohong

doi:10.1016/j.matlet.2022.132728

Cited by 29 publications

(7 citation statements)

References 19 publications

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“…(3) From the perspective of LC-HEACs: LC-HEACs frequently form simple FCC or BCC phase under the circumstances of high mixing entropy impact of various primary components and quick solidification of LC [66,80], which further lessens the development of corroded galvanic cells and reduces the coating's propensity for corrosion.…”

Section: Discussionmentioning

confidence: 99%

“…In fact, LC-HEACs have a suitable coating structure and a flexible selection of coating materials, thus significantly improving the anti-corrosion ability of the substrate surface. The following three reasons (as shown in Figure 5) are primarily responsible for the superior corrosion resistance of LC-HEACs: components and quick solidification of LC [66,80], which further lessens the development of corroded galvanic cells and reduces the coating's propensity for corrosion.…”

Section: Corrosion Resistance Enhancement Mechanismmentioning

confidence: 99%

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Corrosion of Laser Cladding High-Entropy Alloy Coatings: A Review

et al. 2022

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Material corrosion is a common phenomenon. Severe corrosion not only causes material failure, but may also lead to unexpected catastrophic accidents. Therefore, reducing the loss caused by corrosion has become a problem faced by countries around the world. As a surface modification technology, laser cladding (LC) can be used to prepare coatings that can achieve metallurgical bonding with the substrate. High-entropy alloys (HEAs) are a new material with superior anti-corrosion ability. Therefore, HEA coatings prepared by LC have become a research hotspot to improve the anti-corrosive ability of material surfaces. In this work, the effects of LC process parameters, post-processing, and the HEA material system on the anti-corrosion ability of HEA coatings and their mechanisms are reviewed. Among them, the LC process parameters influence the anti-corrosion ability by affecting the macroscopic quality, dilution rate, and uniformity of the coatings. The post-processing enhances the anti-corrosion ability of the coatings by improving the internal defects and refining the grain structure. The anti-corrosion ability of the coatings can be improved by appropriately adding transition metal elements such as Ni, Cr, Co, and rare earth elements such as Ce and Y. However, the lattice distortion, diversification of phase composition, and uneven distribution caused by excess elements will weaken the corrosion protection of the coatings. We reviewed the impact of corrosion medium on the anti-corrosion ability of coatings, in which the temperature and pH value of the corrosion medium affect the quality of the passive film on the surface of the coatings, thereby affecting the anti-corrosion ability of the coatings. Finally, to provide references for future research, the development trend of preparing HEA coatings by LC technology is prospected.

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Section: Discussionmentioning

confidence: 99%

Section: Corrosion Resistance Enhancement Mechanismmentioning

confidence: 99%

Corrosion of Laser Cladding High-Entropy Alloy Coatings: A Review

et al. 2022

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“…Several studies indicate that MCA coatings can provide satisfactory protection for ships and ocean engineering, especially in harsh marine environments [23]. There are different methodologies that have been developed for the successful synthesis of MCA coatings, such as laser remelting [24,25], magnetron sputtering [26], laser cladding [27], thermal spraying [28,29], electrochemical reduction of oxides in molten salts [30], mechanical alloying [4], hydrogen reduction of oxide powers [31], and electrochemical deposition [32][33][34]. All these techniques, except for electrodeposition, are labeled as having a high equipment cost, having relatively high operating temperatures and energy consumption, and presenting difficulty in controlling the coating morphology and composition.…”

Section: Introductionmentioning

confidence: 99%

Effect of Additive and Current Density on Microstructures and Corrosion Behavior of a Multi-Component NiFeCoCu Alloy Prepared by Electrodeposition

Wang,

Ma,

et al. 2024

Crystals

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High-entropy alloys (HEAs) have been attracting growing interest for decades due to their unique properties. Electrodeposition provides a low-cost and convenient route for producing classified types of HEAs, compared to other synthesis techniques, making it an attention-grabbing method. However, fabricating high-quality HEAs through electrodeposition in aqueous electrolytes remains a great challenge. In this study, the effects of additives and current densities on the compositions, surface morphologies, microstructures, and corrosion behavior of the electrodeposited NiFeCoCu alloy are studied. The results indicate that saccharin plays a key role in achieving a flat and bright surface for NiFeCoCu coatings, while also relieving the internal stress and improving anti-corrosion properties. Electrodeposition under a current density of 20–40 mA/cm2 results in a uniform and dense deposit with favorable properties. The present work provides a low-cost and feasible industrial solution for the preparation of HEA coatings, which holds great potential for innovation in the field of HEA coatings through electrodeposition.

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“…The oxides that form on the surfaces of heterogeneities such as the phases of barren Cr element will be less protective and will break down or will undergo preferential dissolution at these regions. Thus, MPEAs with a single-phase structure and uniform distribution of alloying elements will be expected, contributing to enhancing the composition uniformity and structural stability of the passive films [31][32][33] . MPEAs with refractory elements, such as Ti, Zr, Nb, Ta, Mo, V, W, and Hf, namely refractory multi-principal element alloys (RMPEAs), have mostly sample BCC crystal structures and may also contain some intermetallic phases, mainly B2 and/or laves [34][35][36][37][38][39] .…”

Section: Introductionmentioning

confidence: 99%

Recent research progress on the passivation and selective oxidation for the 3d-transition-metal and refractory multi-principal element alloys

Wang,

Yan,

et al. 2023

npj Mater Degrad

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The wide range of alloy composition controllability for multi-principal element alloys (MPEAs) may provide a great opportunity for discovering special forms of surface oxides to improve the corrosion and oxidation resistance in extreme environments. Changing the type and content of promoting passivation elements would not only change the microstructure of the alloy but also significantly affect the composition and structure of the surface passive film, resulting in a strong impact on the corrosion and oxidation resistance of the alloy. This article reviews recent research on the effects of alloying elements on the passivation properties, the contribution of each alloying element, and the synergistic effect between the elements on the passivation mechanisms and electrochemical dissolution characteristics of surface passive films that form on some MPEAs. In addition, the composition and structural characteristics of surface oxides relevant to the selective oxidation of elements are elaborated upon. Finally, several open questions and recommendations for research directions regarding the passivation and selective oxidation of MPEAs were provided to guide future exploration.

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A high-corrosion-resistant high-entropy alloys (HEAs) coatings with single BCC solid solution structure by laser remelting

Cited by 29 publications

References 19 publications

Corrosion of Laser Cladding High-Entropy Alloy Coatings: A Review

Corrosion of Laser Cladding High-Entropy Alloy Coatings: A Review

Effect of Additive and Current Density on Microstructures and Corrosion Behavior of a Multi-Component NiFeCoCu Alloy Prepared by Electrodeposition

Recent research progress on the passivation and selective oxidation for the 3d-transition-metal and refractory multi-principal element alloys

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