Influence of added La2O3 on the microstructure, mechanical properties, and tribocorrosion resistance of TiB2–Ni plasma-sprayed coatings

Zhengyi Li; Yibo Ai; Lei Wen; Hongying Yu; Weidong Zhang; Dongbai Sun

Journal of Materials Research and Technology (Sep 2024)

Influence of added La2O3 on the microstructure, mechanical properties, and tribocorrosion resistance of TiB2–Ni plasma-sprayed coatings

Zhengyi Li,
Yibo Ai,
Lei Wen,
Hongying Yu,
Weidong Zhang,
Dongbai Sun

Affiliations

Zhengyi Li: National Center for Materials Service Safety, University of Science and Technology Beijing, Beijing, 100083, PR China
Yibo Ai: National Center for Materials Service Safety, University of Science and Technology Beijing, Beijing, 100083, PR China; Innovation, Group of Marine Engineering Materials and Corrosion Control, Southern Marine Science and Engineering Guangdong Laboratory, Zhuhai, 519080, PR China
Lei Wen: National Center for Materials Service Safety, University of Science and Technology Beijing, Beijing, 100083, PR China
Hongying Yu: School of Materials, Yat-Sen University, Guangzhou, 510006, PR China
Weidong Zhang: National Center for Materials Service Safety, University of Science and Technology Beijing, Beijing, 100083, PR China; Innovation, Group of Marine Engineering Materials and Corrosion Control, Southern Marine Science and Engineering Guangdong Laboratory, Zhuhai, 519080, PR China; Corresponding author. National Center for Materials Service Safety, University of Science and Technology Beijing, Beijing 100083, PR China.
Dongbai Sun: National Center for Materials Service Safety, University of Science and Technology Beijing, Beijing, 100083, PR China; School of Materials Science and Eigineering, Yat-Sen University, Guangzhou, 510006, PR China; Innovation, Group of Marine Engineering Materials and Corrosion Control, Southern Marine Science and Engineering Guangdong Laboratory, Zhuhai, 519080, PR China; Corresponding author. School of Materials, Yat-Sen University, Guangzhou, 510006, PR China.

Journal volume & issue: Vol. 32
pp. 1469 – 1478

Abstract

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To enhance the tribocorrosion resistance of 7075-T6 aluminum alloy in deep sea environments, TiB2–Ni coatings with varying La2O3 content were deposited on 7075-T6 aluminum alloy substrates using plasma spray technology. The effects of different La2O3 contents on the organization, structure, and properties of the coatings were analyzed. The results indicated that La2O3 incorporation suppressed brittle phase formation such as Ni3B; 1.0 wt% La2O3 addition reduced Ni3B by 16.9%. The coating's corrosion resistance significantly improved with La2O3 doping - the self-corrosion current density of the 1.0 wt% La2O3-doped coating decreased from 71.2 nA/cm2 to 30.2 nA/cm2.

Published in Journal of Materials Research and Technology

ISSN: 2238-7854 (Print); 2214-0697 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Technology: Mining engineering. Metallurgy
Website: https://www.journals.elsevier.com/journal-of-materials-research-and-technology/

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