Surface Modification and Corrosion Performance of Laser Cladded Co–Ni on Ti–6Al–4 V in 0.5 M H2SO4 Environment.
Adesina, Olanrewaju Seun Popoola, Abimbola Patricia Farotade, Gabriel Ayokunle Sanyaolu, Olufemi Oluseun Obadele, Babatunde Abiodun Ikubanni, Peter Pelumi Adediran, Adeolu Adesoji Adeleke, Adekunle Akanni
Adesina, Olanrewaju Seun
Popoola, Abimbola Patricia
Farotade, Gabriel Ayokunle
Sanyaolu, Olufemi Oluseun
Obadele, Babatunde Abiodun
Ikubanni, Peter Pelumi
Adediran, Adeolu Adesoji
Adeleke, Adekunle Akanni
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Abstract
This study investigates the laser cladding of Co and Ni powders onto Ti–6Al–4 V substrates, varying the admixed percentages while adjusting laser processing parameters. The influence of nickel and cobalt contents on the microstructure, phase
composition, and electrochemical behavior of the laser-clad Ti–6Al–4 V coatings were analyzed. Coating morphology and phases were characterized using scanning electron microscopy (SEM) equipped with energy dispersive spectrometry
(EDS), and X-ray diffractometry (XRD), respectively. The corrosion resistance of Ti–6Al–4 V, both with and without Ni–Co additions, in 0.5 M H2SO4 was evaluated using potentiodynamic polarization technique. Results indicated that the coatings
exhibited excellent metallurgical compatibility with the substrate. Additionally, the high scan speed laser-clad samples showed enhanced corrosion resistance compared to those processed at low speeds. The potentiodynamic polarization analysis revealed passive behavior in all specimens, with higher cobalt content notably enhancing passivity and corrosion resistance by suppressing the anodic reaction.
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Date
2024-09-06
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Springer
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Keywords
Laser Cladding, Co–Ni · Microstructure, Phase composition, Corrosion, Ti–6Al–4 V Alloy