Effect of machining‐induced surface integrity on the corrosion behavior of Al–Li alloy 2A97 in sodium chloride solution

Niu, Jintao; Wang, Qingqing; Hua, Yang; Wang, Guijie

doi:10.1002/maco.201810380

Cited by 19 publications

(8 citation statements)

References 32 publications

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“…The corrosion tendency can only indicate the possibility of corrosion, and whether corrosion occurs is determined by the interaction of other factors . Therefore, an electrochemical corrosion test was conducted to analyze the corrosion mechanism of the weld.…”

Section: Resultsmentioning

confidence: 99%

Effect of welding speed on microstructure and corrosion resistance of Al–Li alloy weld joint

Yang

Chen³

et al. 2019

Materials & Corrosion

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The corrosion resistance of a weld has a great impact on the service life of the joint. Changes in welding parameters can cause changes to the heat input, which affect the formation of the weld bead and the precipitation of the second phase, which determines the corrosion resistance of the weld. In this paper, the effect of a change in the welding speed on 2195 aluminium–lithium (Al–Li) alloy joints welded by laser and metal inert gas (laser‐MIG) hybrid welding using Al–Si welding wire was studied. The macrostructure and microstructure of the weld were characterized by optical microscopy, X‐ray diffraction, and scanning electron microscopy. The results show that the predominant precipitates in the laser‐MIG hybrid welded Al–Li alloy were the θ (Al2Cu) and T (Al–Li–Si) phases. As the welding speed increased from 11.5 mm/s to 16.5 mm/s, the heat input decreased, and the amount of the precipitated phase increased. Intergranular corrosion and electrochemical experiments were carried out on the weld seam, and the corrosion resistance was tested. With increasing welding speed, the corrosion resistance of the weld decreased. The high potential of the precipitated phase decreased the corrosion resistance of the weld joint.

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Section: Resultsmentioning

confidence: 99%

Effect of welding speed on microstructure and corrosion resistance of Al–Li alloy weld joint

Yang

Chen³

et al. 2019

Materials & Corrosion

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“…As a wrought alloy, it can be welded, particularly by friction stir welding, and is fracture resistant at cryogenic temperatures. Alternatively, the processing of aluminum-lithium alloys has been achieved by the chemical etching method [ 5 , 6 , 7 , 8 , 9 ], which was not environmentally-friendly due a series of pollution problems. Nowadays, mechanical milling has made great progress, which improves the milling efficiency and avoids environmental pollution.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Ultrasonic-Assisted End Milling Forces in 2195 Aluminum-Lithium Alloy

Wang

Zhang

2022

Materials

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To achieve high-quality machining of the 2195 aluminum-lithium alloy, this paper presents an experimental study on the effect of milling processing parameters on milling forces and surface topography, during which conventional milling and longitudinal-torsional ultrasonic vibration milling of the 2195 Al-Li alloy were performed. The characterization of the tool tip trajectory illustrates some of the advantages of ultrasonic machining, which include variable depth of cut and tool chip pulling. The differences in milling forces between conventional milling and longitudinal-torsional ultrasonic vibration machining were compared using orthogonal tests, and the effect of ultrasonic vibration on milling forces was investigated in detail. The maximum reduction of milling force Fy in the feed direction under the influence of torsional vibration is 62% and 54% for larger feed per tooth and cutting depth, respectively. The high-frequency impact generated by the longitudinal vibration not only reduces the chip accumulation on the surface, but also smooths out the tool-tooth scratches and creates a regular surface profile. In addition, the characteristics of the milling force signals of the two machining methods were analyzed, and the analysis of the spectrum of the collected milling forces revealed that the ultrasonic vibration caused the high-frequency components of the milling forces Fy and Fz. The orthogonal result analysis and single-factor result analysis verified the superiority of ultrasonic machining, provided parameter selection for subsequent aluminum-lithium alloy machining, and bridged the gap of longitudinal torsional ultrasonic vibration machining of 2195 aluminum-lithium alloy in the study of milling force.

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“…The corrosion behavior of materials is not only related to their own element composition, but also related to the surface condition in direct contact with the corrosive medium in the service environment. Niu et al [7] compared the corrosion resistance of milling surface and polished surface of 2A97 Al-Li alloy in 3.5 wt% NaCl solution with polarization tests. Experimental results can fully prove that the corrosion resistance of milled surface is better than that of polished surface.…”

Section: Introductionmentioning

confidence: 99%

Comparison Study on Machined Surface Integrity and Corrosion Resistance of 2024 Aluminum Alloy

Huang

Niu²,

Li³

et al. 2022

J. Phys.: Conf. Ser.

Self Cite

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2024 aluminum alloy is an engineering equipment material with broad application prospects, which can be used in space flight and shipbuilding industry. However, the lack of corrosion resistance hinders its further application. The effects of milling and further shot peening processes on the surface integrity of 2024 aluminum alloy were investigated. Electrochemical polarization measurements were performed in 3.5wt% NaCl solution to characterize the corrosion resistance of milling alone surfaces and the further shot-peening process surfaces after milling. Experimental results reveal that the surface residual stress and microhardness of the shot-peened surfaces are much higher than those of the only milling surfaces owing to the severer plastic deformation induced by further shot peening process. While the shot-peened surfaces are roughened with the higher surface roughness. Under the synergic effects of three terms mentioned above, the corrosion potential of shot-peened surfaces is much positive than that of milled ones, meaning the corrosion resistance after shot peening is better. The comparison test gives a way to enhance the corrosion behavior of 2024 aluminum alloy milled surfaces.

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Effect of machining‐induced surface integrity on the corrosion behavior of Al–Li alloy 2A97 in sodium chloride solution

Cited by 19 publications

References 32 publications

Effect of welding speed on microstructure and corrosion resistance of Al–Li alloy weld joint

Effect of welding speed on microstructure and corrosion resistance of Al–Li alloy weld joint

Experimental Study on Ultrasonic-Assisted End Milling Forces in 2195 Aluminum-Lithium Alloy

Comparison Study on Machined Surface Integrity and Corrosion Resistance of 2024 Aluminum Alloy

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