TY - JOUR
T1 - Comparative Study on the Corrosion Performance of APS-, HVOF-, and HVAF-Sprayed NiCr and NiCrBSi Coatings in NaCl Solutions
AU - Somervuori, Mervi
AU - Varis, Tommi
AU - Oksa, Maria
AU - Suhonen, Tomi
AU - Vuoristo, Petri
N1 - Funding Information:
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).
PY - 2022/6
Y1 - 2022/6
N2 - 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.
AB - 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.
KW - corrosion resistance
KW - electrochemical measurements
KW - immersion
KW - Ni-based coatings
KW - thermal spray
UR - http://www.scopus.com/inward/record.url?scp=85129264424&partnerID=8YFLogxK
U2 - 10.1007/s11666-022-01389-x
DO - 10.1007/s11666-022-01389-x
M3 - Review Article
AN - SCOPUS:85129264424
SN - 1059-9630
VL - 31
SP - 1581
EP - 1597
JO - Journal of Thermal Spray Technology
JF - Journal of Thermal Spray Technology
IS - 5
ER -