Comparative Study on the Corrosion Performance of APS-, HVOF-, and HVAF-Sprayed NiCr and NiCrBSi Coatings in NaCl Solutions

Mervi Somervuori (Corresponding Author), Tommi Varis, Maria Oksa, Tomi Suhonen, Petri Vuoristo

Research output: Contribution to journalReview ArticleScientificpeer-review

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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 languageEnglish
Pages (from-to)1581-1597
Number of pages17
JournalJournal of Thermal Spray Technology
Volume31
Issue number5
Early online date14 Apr 2022
DOIs
Publication statusPublished - Jun 2022
MoE publication typeA2 Review article in a scientific journal

Keywords

  • corrosion resistance
  • electrochemical measurements
  • immersion
  • Ni-based coatings
  • thermal spray

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