Additive manufactured corrosion-resistant SS316L/IN625 functionally graded multi-material in hydrofluoric acid (HF) environment

Shuyao Zhang, Hailong Dai, Yajing Li, Zhe Zhang*, Sheng Chen, Meng He, Bo Zhang, Yushan Ma, Xu Chen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Multi-materials were designed for the severe corrosion environment in fluorine chemical industry. Directed energy deposition with laser beam (DED-LB) was used to manufacture SS316L/IN625 multi-materials with direct combination (DC) and graded transition (GT) structures. Partial immersion tests in 40% HF solution were conducted. The corrosion rate of SS316L/IN625 multi-materials was less than 1 mm/y. However, localized galvanic corrosion was observed in the DC samples because of the sudden change in chemical composition at the interface. The GT samples effectively eliminated this issue by gradually increasing Ni, showing good economic efficiency and reliability for the multi-phase HF corrosion environment.

Original languageEnglish
Article number111926
JournalCorrosion Science
Volume230
DOIs
Publication statusPublished - 15 Apr 2024
Externally publishedYes

Keywords

  • Galvanic corrosion
  • Hydrofluoric acid (HF)
  • Laser beam directed energy deposition (DED-LB)
  • Multi-material

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