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.
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