Skip to Main content Skip to Navigation
Theses

Rôle de la microstructure sur les mécanismes de corrosion marine d’un dépôt à base d’aluminium élaboré par projection dynamique par gaz froid (« cold spray »)

Abstract : Cold spray process is based on spraying particles carried by a gas at a supersonic speed onto a substrate. Particle deformation during impact with the substrate creates a coating. This spraying process can retain particle microstructure and produce very dense coating. This property is crucial for anticorrosion applications. The aim of this work is to understand the effect of cold spray aluminum coating microstructure on marine corrosion mechanisms. To achieve this goal, several aluminum powders (including pure aluminum, aluminum alloys and mixtures with alumina) are sprayed onto a steel substrate. Coating microstructure is studied down to a nanoscale (TEM). The coating-substrate bond strength is determined using pull-off testing. From a thorough microstructure study, various mechanisms are proposed to explain multiscale porosity formation in coatings. A numerical study using finite elements modeling complements this microstructure analysis. From particle speed (DPV-2000) and temperature (thermal camera) measurements during impact, new material models are optimized to model aluminum and alumina behavior at particle impact. Moreover, corrosion tests are conducted (including immersion and salt spray tests). The study of corroded coating microstructures is used to identify corrosion mechanisms which occur in the coating. A relationship between coating porosity and its corrosion behavior is particularly brought into light. Finally, a first approach to a technological transfer of this process to an industrial application is proposed.
Document type :
Theses
Complete list of metadatas

https://pastel.archives-ouvertes.fr/tel-03118364
Contributor : Abes Star :  Contact
Submitted on : Friday, January 22, 2021 - 10:33:12 AM
Last modification on : Sunday, January 24, 2021 - 3:22:16 AM

File

2018PSLEM005_archivage.pdf
Version validated by the jury (STAR)

Identifiers

  • HAL Id : tel-03118364, version 1

Citation

Pierre-Emmanuel Leger. Rôle de la microstructure sur les mécanismes de corrosion marine d’un dépôt à base d’aluminium élaboré par projection dynamique par gaz froid (« cold spray »). Matériaux. Université Paris sciences et lettres, 2018. Français. ⟨NNT : 2018PSLEM005⟩. ⟨tel-03118364⟩

Share

Metrics

Record views

57

Files downloads

13