Fabrication and corrosion resistance of HVOF-sprayed Ni2Si intermetallic compound
Source abstract
Abstract
Abstract In this study, Ni 2 Si powders were deposited onto 420 stainless steel substrate using high velocity oxy-fuel (HVOF) process. The coatings were characterized by X-ray diffractometery, optical and scanning electron microscopy and microhardness measurements. Tafel polarization tests and electrochemical impedance spectroscopy (EIS) measurements were employed to study corrosion performance of the coatings in 70% H 2 SO 4 media at room temperature. Here, a dense sintered Ni 2 Si was used as reference material. The results showed the phase composition of HVOF coating is similar to that of feedstock powders. The corrosion rate of HVOF Ni 2 Si coatings was much lower than that of 420 stainless steel substrate but slightly higher than that of bulk Ni 2 Si. Further investigation showed that both thermally sprayed and sintered (reference) Ni 2 Si alloys exhibited similar anodic polarization behavior including a narrow active section followed by a wide passive region.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: High-Temperature Coating Behaviors · Advanced materials and composites · Semiconductor materials and devices
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (24)
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