Abstract
The effect of Cu and Fe addition on the corrosion resistance of Ni-30Co-16Cr-15Mo in hydrofluoric acid was investigated by immersion testing at 100. °C. Microstructural observation revealed that adding 15. wt.% Fe gives rise to a significantly deteriorated corrosion resistance that is characterized by preferential dissolution along grain boundaries, especially in cold-forged sample. Meanwhile, alloy modified with 15. wt.% Fe and 2. wt.% Cu exhibited a tremendous improvement in corrosion resistance, even after cold forging. This is probably attributed to the rapid formation of a Cu-rich passive film, which is ascribable to the noble nature and high reorganising ability of Cu.
Original language | English |
---|---|
Pages (from-to) | 81-92 |
Number of pages | 12 |
Journal | Corrosion Science |
Volume | 89 |
Issue number | C |
DOIs | |
Publication status | Published - 2014 |
Keywords
- Acid corrosion
- Cobalt
- Nickel
- Passive films
- SEM
- XRD
ASJC Scopus subject areas
- Chemistry(all)
- Chemical Engineering(all)
- Materials Science(all)