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Corrosion properties of Ti-Ni-Cu coatings fabricated by laser surface alloying

Corrosion Science, ISSN: 0010-938X, Vol: 222, Page: 111426
2023
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Article Description

Laser surface alloying was used to fabricate TiNi- x Cu ( x  = 9.4 to 26.0  wt %) coatings on Ti-Ni substrate by controlling the thicknesses of preplaced Cu layers and laser scanning speed. The obtained results showed that the microstructure, hardness and corrosion behavior of the coatings depend on the Cu content. In the coatings, the volume fractions of Ti 2 Ni, TiNi 2 Cu and β-Ti increase significantly with the increment in the Cu content. The comparisons with the Ti-Ni alloy showed that the TiNi- x Cu coatings exhibit a noble shift in the open-circuit potential. However, TiNi-26.0Cu presents the highest corrosion rate due to the most unstable passive film and the preferential dissolution of the largest amount of TiNi 2 Cu.

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