Electrochemical and corrosion behaviour of laser modified aluminium surfaces

Bonora, P.L.; Bassoli, M.; Anna, P. L. De; Battaglin, Giancarlo; Mea, G. Della; Mazzoldi, P.; Miotello, A.

doi:10.1016/0013-4686(80)87168-4

Cited by 33 publications

(13 citation statements)

References 5 publications

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“…Reviewing of the available literature, indicates that LSM enhances the corrosion performance of the aluminium alloy in chloride containing environments, due to the partial or whole dissolution of the cathodic second phase particles (especially those rich in copper), which reduces the galvanic corrosion susceptibility and substantially modifies the corrosion mechanism of the alloy [30][31][32][33][34]. Nonetheless, to date, very little information can be found in the literature regarding laser treatment of MMCs [35].…”

Section: Introductionmentioning

confidence: 99%

High power diode laser treatments for improving corrosion resistance of A380/SiCp aluminium composites

Viejo

Pardo

Rams

et al. 2008

Surface and Coatings Technology

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Section: Introductionmentioning

confidence: 99%

High power diode laser treatments for improving corrosion resistance of A380/SiCp aluminium composites

Viejo

Pardo

Rams

et al. 2008

Surface and Coatings Technology

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“…[8,9] Recently, particular attention has focussed on excimer laser radiation sources in the UV wavelength range, with pulse durations in the nanosecond range. Such a processing, with extremely fast cooling rates of up to 10 11 K/s, [10] favours formation of amorphous or rapidly solidified microstructures that are considered to be largely free of segregation and intermetallic precipitates. [11,12] Particularly, recent work of the authors has demonstrated that LSM of AA2050-T8 and AA2024-T351 aluminium alloys with an excimer laser produced a relatively uniform melted layer, with a melt depth up to 15 µm; further, relatively coarse intermetallic particles and dispersoids within the original alloy matrix are absent in the laser-melted region.…”

Section: Introductionmentioning

confidence: 99%

Performance of Al alloys following excimer LSM—anodising approaches

Viejo

Aburas

Coy

et al. 2009

Surface & Interface Analysis

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The potential application of laser surface melting (LSM) as a pre-treatment prior to conventional anodising in sulfuric acid electrolyte has been evaluated. For this purpose, AA2050-T8 (Al-Cu-Li) and AA2024-T351 (Al-Cu-Mg) aerospace alloys were compared. For LSM, a KrF excimer laser (248 nm) was used, with variation of the number of pulses received per unit area. After LSM, the specimens were anodised at a constant voltage of 12 V in 0.46 M H 2 SO 4 for different times from 4 to 20 min, followed by sealing in boiling water for 30 min. Material characterisation, in terms of surface morphology, microstructural and laser-induced phase transformations, was performed using scanning and transmission electron microscopies (TEMs). The corrosion behaviour was evaluated using the ASTM G34-01 EXCO test at 25• C for 6 h. The results showed that excimer LSM, used as a pre-treatment prior to anodising, greatly improved the anodising performance, through the dissolution of intermetallic phases in the near-surface alloy. Further, different exfoliation susceptibility was observed by comparing both alloys, being strongly dependent on the presence and distribution of the main constituent phases, e.g. T 1 (Al 2 CuLi) and S (Al 2 CuMg) phases, for AA2050-T8 and AA2024-T351, respectively.

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“…Laser modification using a 2 kW CO 2 laser (λ = 10.6 µm, CW) caused an increase of breakdown potential when compared to the untreated sample [10]. It was also confirmed that the ruby (λ = 694.3 nm, τ = 15 ns) [11], Nd:YVO 4 (λ = 1064 nm, τ = 10 ps) [12], and fiber laser (λ = 1064 nm, τ = 10 ns) improves the corrosion resistance of the aluminum alloy when compared to the untreated reference sample [13]. The increase in corrosion resistance may result from the physicochemical changes in the surface layer-the MgAl 2 O 4 as a result of the interaction of laser radiation transforms into a new, more protective oxide layer containing Al 2 O 3 [13].…”

Section: Introductionmentioning

confidence: 64%

“…In particular, the highest applied laser fluence F = 9 kJ/cm 2 , causes a significant modification in the geometric structure (surface roughness) ( Figure 1g). Heterogeneities and surface defects are conducive to the appearance of corrosion [11].…”

Section: Resultsmentioning

confidence: 99%

The Corrosion Resistance of Aluminum Alloy Modified by Laser Radiation

2019

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This study presents an analysis of the impact of the oxide layers, prepared utilizing fiber laser radiation (1062 nm) in ambient air with different process parameters, on the corrosion resistance of EN 5754 aluminum alloy. Due to both high corrosion resistance and high fatigue strength, a 5754 alloy is used, among others, in the marine, aerospace, automotive, and chemical industries. Nevertheless, it corrodes in aggressive environments (with high chloride ions concentration). The controlled delivery of laser radiation energy in the oxygen environment allows the formation of the oxide layer on the surface of the material. We have determined that it significantly affects the resistance of these materials to corrosion. As a result of laser irradiation, changes in the chemical structure of the surface layer (chemical composition as well as surface development) can be observed. It may exert both a positive and a negative consequence on the corrosion resistance. The electrochemical corrosion tests (potentiodynamic polarization and electrochemical impedance spectroscopy EIS) have been carried out in an aggressive environment (3% NaCl). Moreover, microscopic examination, chemical tests, and roughness were also performed. The study revealed that appropriate control of the laser process can significantly increase the original corrosion resistance of the 5754 aluminum alloy.

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Electrochemical and corrosion behaviour of laser modified aluminium surfaces

Cited by 33 publications

References 5 publications

High power diode laser treatments for improving corrosion resistance of A380/SiCp aluminium composites

High power diode laser treatments for improving corrosion resistance of A380/SiCp aluminium composites

Performance of Al alloys following excimer LSM—anodising approaches

The Corrosion Resistance of Aluminum Alloy Modified by Laser Radiation

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