Abstract
Corrosion performance of NiCr and NiCrBSi coatings produced by APS, HVOF, and HVAF was studied by electrochemical measurements and immersion tests in 0.5 and 3.5 wt.% NaCl solutions. In the electrochemical measurements, the NiCr coatings performed better than the NiCrBSi coatings. The effect of the coating process on the corrosion resistance of the material was significantly lower than that of the selected materials, NiCr or NiCrBSi. All the coatings showed a tendency to passivate but suffered from localized corrosion. During immersion exposure for ten weeks, localized corrosion appeared at heterogeneous areas of the coatings, including voids, defects, or powder particles that had not melted during the spraying process.
| Original language | English |
|---|---|
| Pages (from-to) | 1581-1597 |
| Journal | Journal of Thermal Spray Technology |
| Volume | 31 |
| Issue number | 5 |
| Early online date | 14 Apr 2022 |
| DOIs | |
| Publication status | Published - Jun 2022 |
| MoE publication type | A2 Review article in a scientific journal |
Funding
This study was funded by Academy of Finland Project SA_HIERARCH - Enabling phenomena behind multihierarchial strengthening of high-kinetic sprayed metallic coatings. Open Access funding provided by Technical Research Centre of Finland (VTT).
Keywords
- corrosion resistance
- electrochemical measurements
- immersion
- Ni-based coatings
- thermal spray