Accéder directement au contenu Accéder directement à la navigation
Article dans une revue

Corrosion behavior of cold sprayed 7075Al composite coating reinforced with TiB2 nanoparticles

Abstract : Cold spray (CS), as a novel surface treatment technique, has been widely used for repairing damaged components and as protecting coatings, especially for the applications of aircraft and marine components. To further improve the mechanical properties, while maintaining the corrosion resistance of pure Al and Al alloy coatings, ceramic particles are commonly added into the Al matrix to produce particle-strengthened Al matrix composite (P-AMC) coatings. In this study, dense 7075Al composite coatings reinforced with uniformly distributed in-situ TiB2 nanoparticles (hereafter named TiB2/7075Al) were successfully produced by CS using a gas-atomized composite powder and the propulsive gases of air and helium. Following this, the corrosion behavior of the cold sprayed (CSed) TiB2/7075Al composites was investigated using Tafel polarization, electrochemical impedance, spectroscopy, and immersion tests in 0.1 M and 0.6 M NaCl solutions, and were compared to those of the CSed pure 7075Al coating and bulk 7075Al-T6 material. Electrochemical tests revealed that the composite coating exhibits a higher corrosion rate than the pure 7075Al coating, primarily caused by a galvanic coupling between TiB2 nanoparticles and the more active Al matrix. Compared to the air-processed coatings, the He-processed ones exhibit higher densities of defects, like dislocations, and precipitates due to larger plastic deformation of the sprayed particles, which result in more active sites for corrosion and thus lower corrosion resistance. Low-temperature annealing treatment (230 °C/6 h) reduces these defects to increase the corrosion resistance of the CSed coatings. Comparatively, high-temperature annealing treatment (412 °C/4 h) results in the coarsening of precipitates and grain growth to increase the corrosion rate of the coatings. Corrosion mechanisms of the CSed and annealed composite coatings related to the microstructure evolution were investigated in detail.
Liste complète des métadonnées

https://hal.univ-lille.fr/hal-03007358
Contributeur : Lilloa Université de Lille <>
Soumis le : lundi 16 novembre 2020 - 12:27:46
Dernière modification le : mardi 17 novembre 2020 - 03:23:54

Identifiants

Collections

Citation

Xinliang Xie, Bilel Hosni, Chaoyue Chen, Hongjian Wu, Yuelin Li, et al.. Corrosion behavior of cold sprayed 7075Al composite coating reinforced with TiB2 nanoparticles. Surface and Coatings Technology, 2020, Surface and Coatings Technology, 404, pp.126460. ⟨10.1016/j.surfcoat.2020.126460⟩. ⟨hal-03007358⟩

Partager

Métriques

Consultations de la notice

8