Titre :

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

Auteur(s) :

Xie, Xinliang [Auteur]
Hosni, Bilel [Auteur]
Chen, Chaoyue [Auteur]
Wu, Hongjian [Auteur]
Li, Yuelin [Auteur]
Chen, Zhe [Auteur]
Verdy, Christophe [Auteur]
Kedim, Omar E.I. [Auteur]
Zhong, Qingdong [Auteur]
Addad, Ahmed [Auteur]
Unité Matériaux et Transformations - UMR 8207 [UMET]
Coddet, Christian [Auteur]
Ji, Gang [Auteur]
Unité Matériaux et Transformations - UMR 8207 [UMET]
Liao, Hanlin [Auteur]

Titre de la revue :

Surface and Coatings Technology

Nom court de la revue :

Surface and Coatings Technology

Numéro :

404

Pagination :

126460

Éditeur :

Elsevier BV

Date de publication :

2020-10-02

ISSN :

0257-8972

Discipline(s) HAL :

Chimie/Matériaux
Physique [physics]/Matière Condensée [cond-mat]/Science des matériaux [cond-mat.mtrl-sci]

Résumé en anglais : [en]

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 ...
Lire la suite >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.Lire moins >

Langue :

Anglais

Audience :

Internationale

Établissement(s) :

Université de Lille
CNRS
INRA
ENSCL

Collections :

• Unité Matériaux et Transformations (UMET) - UMR 8207

Équipe(s) de recherche :

Métallurgie Physique et Génie des Matériaux

Date de dépôt :

2020-10-19T19:28:05Z
2020-11-16T11:27:34Z