Enhanced Compressive Property of Al Composite Foams at Elevated Temperatures via Plasma Electrolytic Oxidation

Liu, Hua‐Min; Pan, Wenchi; Si, Fujian; Huang, Kuo Chan; Liu, Yan; Liu, Jiaan

doi:10.3390/met8020118

Cited by 7 publications

(6 citation statements)

References 22 publications

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“…The other part of the sample plays an anodic role, with low electrochemical activity, because the values of the anodic current density did not exceed 2 μA cm −2 after 510 min of the specimen exposure (Figure 3a). The reason of low anodic current density uniformly distributed over the surface of the investigated material is related to unopened pores of the PEO-coating, which constitutes one of the peculiarities of such a type of coatings [34,36,42,43,44,45,46,47]. The maximum current density difference between anodic and cathodic values (∆ i z , z stands for the vertical axis of the SVET probe vibration) for the Al sample without coating after 510 min of the specimen exposure to 0.5 M NaCl solution (Figures 3 and 4b in [1]) was equal to 180 μA cm −2 .…”

Section: Resultsmentioning

confidence: 99%

Corrosion of the Welded Aluminium Alloy in 0.5 M NaCl Solution. Part 2: Coating Protection

et al. 2018

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The high electrochemical activity of the aircraft 1579 aluminium alloy with a welded joint and the necessity of the coating formation to protect this material against corrosion as well as to increase the stability of the weld interface in the corrosive medium has been previously established. In this work, two suggested methods of protective coating formation based on plasma electrolytic oxidation (PEO) in tartrate-fluoride electrolyte significantly increased the protective properties of the welded joint area of the 1579 Al alloy. The electrochemical properties of the formed surface layers have been investigated using SVET (scanning vibrating electrode technique) and SIET (scanning ion-selective electrode technique), EIS (electrochemical impedance spectroscopy), OCP (open circuit potential), and PDP (potentiodynamic polarization) in 0.5 M NaCl. The less expressed character of the local electrochemical processes on the welded 1579 Al alloy with the composite coating in comparison with the base PEO-layer has been established. Polymer-containing coatings obtained using superdispersed polytetrafluoroethylene (SPTFE) treatment are characterized by the best possible protective properties and prevent the material from corrosion destruction. Single SPTFE treatment enables one to increase PEO-layer protection by 5.5 times. The results of this study indicate that SVET and SIET are promising to characterize and to compare corrosion behaviour of coated and uncoated samples with a welded joint in chloride-containing media.

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Section: Resultsmentioning

confidence: 99%

Corrosion of the Welded Aluminium Alloy in 0.5 M NaCl Solution. Part 2: Coating Protection

et al. 2018

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“…Recently, surface treatment has been observed to be a more convenient method for enhancing the energy absorption of aluminium foams. Anodising [7][8][9][10] and metal deposition [11][12][13][14][15] are commonly used for surface treatment.…”

Section: Introductionmentioning

confidence: 99%

“…This should be considered in practical applications. Aluminium foams with ceramic coatings show better compression properties at higher compression temperatures [10]. In addition, the Al foams exhibit remarkable corrosion resistance after being combined with enamel coating [16].…”

Section: Introductionmentioning

confidence: 99%

Improved energy absorption capacity of closed-cell aluminium foams by electroplating

Liu

Cheng

Liu

et al. 2022

Surface Engineering

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In the present study, hybrid closed-cell foams consisting of two materials with different ductilities were manufactured to improve the energy absorption capacity. The mechanical characteristics, deformation modes and energy absorption capacities of the foams were investigated. Furthermore, the energy absorption mechanisms of the hybrid foams were analysed. The results demonstrated a significant synergistic effect between the foams and coating with different ductilities during deformation. Their combination increased the densification strain and improved the energy absorption capacity of the samples. Among the specimens investigated, the Al/Zn-Cu(A) foam showed the best densification strain (0.75) and presented superior energy absorption capacities (energy absorption capacity per unit volume (U v ) = 4.5 J cm -3 ; energy absorption capacity per unit mass (U m ) = 8.4 J g -1 ). The intrinsic mechanism of energy absorption optimisation is a combination of the advantages of brittle and ductile deformation modes.

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“…Partial foaming of hollow components has a smaller environmental impact and is more cost effective than the welding of various stiffeners. Moreover, the foam increases the capability of the component to absorb front and/or side crash energy [2][3][4][5][6][7][8][9][10] and suppress the noise and vibration of the originally hollow structure [11].…”

Section: Introductionmentioning

confidence: 99%

Closed-Cell Powder Metallurgical Aluminium Foams Reinforced with 3 vol.% SiC and 3 vol.% Graphite

et al. 2021

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Closed-cell aluminium foams (nominal composition: AlSi12Mg0.6Fe0.3) were prepared by the powder metallurgical route (using 0.4 wt.% TiH2 untreated powder as the foaming agent). Pure foams and foams with the addition of 3 vol.% graphite or SiC powder were prepared. The microstructure and mechanical properties of the prepared aluminium foams containing reinforcing particles were investigated at constant density and compared to those of the pure foam. Vibration measurements were performed to determine the damping properties and modulus of elasticity of the foams. Uniaxial compression tests were performed to determine the following mechanical properties: collapse stress, efficiency of energy absorption, plateau length and densification strain of the foams. All the foams behaved in a brittle manner during compression. Finally, the effect of admixed graphite and SiC powders on the properties of the investigated foam was evaluated, discussed and modelled. The addition of powders changed all investigated properties of the foams. Only the efficiency of energy absorption at constant density was almost identical.

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Enhanced Compressive Property of Al Composite Foams at Elevated Temperatures via Plasma Electrolytic Oxidation

Cited by 7 publications

References 22 publications

Corrosion of the Welded Aluminium Alloy in 0.5 M NaCl Solution. Part 2: Coating Protection

Corrosion of the Welded Aluminium Alloy in 0.5 M NaCl Solution. Part 2: Coating Protection

Improved energy absorption capacity of closed-cell aluminium foams by electroplating

Closed-Cell Powder Metallurgical Aluminium Foams Reinforced with 3 vol.% SiC and 3 vol.% Graphite

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