Abstract
A corrosion assessment of as cast Al–Li–Ni–Sb–Ag alloy in 0.5 M NaCl and acid rain solutions using electrochemical techniques was performed. The macrostructure observed is composed of two of Al–Ni secondary phases formed by elongated grains and clusters of micro-rod formations of both Al3Ni (β, θ) and the AlSb (γ) phases, dispersed in the α–Al matrix. Li and Ag were incorporated in solid solution as well as the Ag3Al phase. Potentiodynamic results showed higher activity in the 0.5 M NaCl 100% solution than in the acid rain sample, wherein the alloy developed a protective corrosion product layer. Similarly, the long-term measurements showed Rp kinetic values of up to 5.5 kOhm cm2 initially, but decaying and stabilizing at around 2.5 kOhm cm2 immersed in 95 vol.% of NaCl solution. Corrosion mechanisms are discussed in terms of activation and finite diffusion, and an inductive mechanism in acid rain. Results were complemented by X-Ray, scanning electron microscopy SEM and EDS characterization.
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The authors, thanks for their support of the Materials Degradation and the Foundry and Tribology laboratories of UMSNH, and the financial support thought the Research Project 2022 by the Coordination of Scientific Research of UMSNH.
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Merino-Duran, M.D., Bedolla-Jacuinde, A., la Torre, G.CD. et al. Corrosion assessment of an Al–Li–Ni–Sb–Ag base alloy in aqueous solutions. MRS Advances 7, 1054–1059 (2022). https://doi.org/10.1557/s43580-022-00411-2
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DOI: https://doi.org/10.1557/s43580-022-00411-2