The Corrosion Resistance of Aluminum Alloy Modified by Laser Radiation

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...

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Bibliographic Details
Published in:Coatings (Basel) 2019-10, Vol.9 (10), p.672
Main Authors: Mroczkowska, K.M., Antończak, A.J., Gąsiorek, J.
Format: Article
Language:English
Subjects:
Aerospace industry
Alloys
Aluminum alloys
Aluminum base alloys
Analytical chemistry
Chemical composition
Chemical industry
Chemical tests
Chloride ions
Corrosion fatigue
Corrosion resistance
Corrosion resistant alloys
Corrosion tests
Electrochemical corrosion
Electrochemical impedance spectroscopy
Electrode polarization
Electrodes
Fatigue strength
Fiber lasers
Impact analysis
Lasers
Marine chemistry
Metal fatigue
Morphology
Oxidation
Process parameters
Radiation
Spectrum analysis
Surface layers
Weight reduction
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Summary: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.
ISSN:2079-6412
2079-6412
DOI:10.3390/coatings9100672