Preparation and electrochemical properties of Cr(III)–Ti-based coatings on 6063 Al alloy

Yu, Hui; Huang, Xue Yi; Lei, Fu; Tan, Xue Cai; Yan, Han

doi:10.1016/j.surfcoat.2012.12.042

Cited by 8 publications

(4 citation statements)

References 20 publications

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“…We first set initial and boundary conditions. Since the heat transfer process did not start before electron beam melting, the initial temperature was T 0 (25 • C at room temperature), which is given in expression (2). The electron beam melting experiments were performed under vacuum conditions and the boundary conditions did not take into account the effect of thermal convection.…”

Section: Heat Transfer Equation Systemmentioning

confidence: 99%

“…However, the melting point, hardness and corrosion resistance of aluminum alloys are low compared to many alloy materials, which limits their application in industry [1]. At present, there is a large amount of research on the surface modification of aluminum alloys at home and abroad [2][3][4][5][6], such as chemical conversion film, electroplating, micro-arc oxidation, laser melting and electron beam melting, etc. However, compared with these, electron beam melting technology results in a thicker melting layer.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Pre-Set Coating Thickness on the Quality of Electron Beam Cladding Forming of Aluminum Alloys

Zeng¹,

Liu²,

Tang³

et al. 2022

Coatings

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Numerical simulations combined with electron beam melting were adopted to study the effect of the thickness of the preset coating on the quality of electron beam melting and forming of aluminum alloys. The research was carried out using ANSYS19.0 finite element analysis software to perform the numerical simulation of the temperature field and stress field during the process of electron beam melting of the Ni60 coating on 6061 aluminum alloy. The results show that the thicker the preset coating, the higher the surface temperature and the greater the melting depth and width of the melt pool, but the smaller the substrate melting depth, and the highest surface temperature obtained was 2536.05 °C. When the coating thickness reached 1.5 mm, the substrate essentially showed no change; otherwise, the thicker the preset coating, the greater the residual stress, and the maximum residual stress on the coating surface along the scanning direction appeared at the position near the boundary. Moreover, the maximum residual stress along the depth direction occurred at the interface. The electron beam cladding experiments showed that the 0.5 mm thickness of the coating resulted in a cracking phenomenon at the interface with the substrate, and the surface of the molten layer had more defects such as pores and pits; the 1 mm thickness of the coating had a good metallurgical bond with the substrate, and the surface of the molten layer was dense and flat; the 1.5 mm thickness of the aluminum alloy substrate did not melt, and the surface of the molten layer had more cracks. The numerical simulation was essentially consistent with the electron beam cladding experiment, and the forming quality was better when the preset coating thickness was 1 mm.

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Section: Heat Transfer Equation Systemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Pre-Set Coating Thickness on the Quality of Electron Beam Cladding Forming of Aluminum Alloys

Zeng¹,

Liu²,

Tang³

et al. 2022

Coatings

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“…Ti has excellent anticorrosive and decoration properties, which is similar to Cr element. Previous studies have focused their attention on corrosion and oxidation resistances of binary Cr-Ti alloy films as an important issue of these materials [25][26][27][28][29]. More recently, Zhang et al [30] investigated the structure and mechanical properties of Cr-Ti alloy films, however, in the Ti-rich region, and they found that mechanical properties of the films were highly related to the phase constitution of Ti basis.…”

Section: Introductionmentioning

confidence: 99%

The structure and mechanical properties of Cr-based Cr-Ti alloy films

Liu¹,

Miao²,

Xu³

et al. 2022

Mater. Res. Express

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Previous studies have dealt with Cr and its alloy films that exhibit promising characteristics as surface modification layers for antiwear, anticorrosive, and decorative applications. However, the effect of Ti alloying on the structure and mechanical properties of Cr films has not been studied. This work aimed to the structure and mechanical properties of Cr-Ti alloy films in the Cr-rich side. To this end, pure Cr, Cr-6 at.% Ti, Cr-11 at.% Ti, Cr-16 at.% Ti, and Cr-21 at.% Ti alloy films were prepared by magnetron sputtering, and the structure and mechanical properties of the films were evaluated. The results indicated that all the films exhibited a Cr-based growth with body-centered cubic structure, and increasing the Ti content decreased the (110) orientation growth of Cr basis. Ti alloying increased the hardness of the films, while leaded to a monotonic decrease in the modulus of the films. The first-principles method was employed to demonstrate that the reduced modulus was determined by the Ti alloying degree, rather than the orientation evolution of the films. The analysis of H/E value suggested that the wear resistance of the films was improved by Ti alloying. The mechanical properties of present Cr-Ti alloy films, and other Cr-based alloy films or metallic glasses in publications were compared and discussed. We proposed that Ti alloying is a considerable way to explore advanced mechanical properties of Cr-based alloy films.

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“…However, while the treatment provides an excellent protection layer on Al alloys, hexavalent chromium-containing compounds are very toxic and considered hazardous to the soil and groundwater. As such, several new processes have been developed as potential replacements for hexavalent chromium-based films [2,3].…”

Section: Introductionmentioning

confidence: 99%

Preparation and electrochemical properties of an electropolymerized polyacrylamide-based cross-linking copolymer film on 6063 Al alloy

Wei

Lei

et al. 2015

Progress in Organic Coatings

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Preparation and electrochemical properties of Cr(III)–Ti-based coatings on 6063 Al alloy

Cited by 8 publications

References 20 publications

Effect of Pre-Set Coating Thickness on the Quality of Electron Beam Cladding Forming of Aluminum Alloys

Effect of Pre-Set Coating Thickness on the Quality of Electron Beam Cladding Forming of Aluminum Alloys

The structure and mechanical properties of Cr-based Cr-Ti alloy films

Preparation and electrochemical properties of an electropolymerized polyacrylamide-based cross-linking copolymer film on 6063 Al alloy

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