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- Title
Effect of heat treatment on corrosion resistance of supersonic atmospheric plasma-sprayed Cr<sub>3</sub>C<sub>2</sub>–NiCr coating.
- Authors
Chong, Kai; Liang, Xiubing; Zhang, Zhibin; Zou, Yong
- Abstract
Supersonic atmospheric plasma spraying (SAPS) is a newly developed technique in preparing high-performance Cr3C2–NiCr coatings with a high deposition efficiency. In this work, the effect of post-heat treatment on carbide precipitation and corrosion property of the SAPS Cr3C2–NiCr coatings was investigated. The results suggested that heat treatment induced the precipitation of secondary carbide grains, and the size of these carbides increased with the increasing heat treatment temperature. In addition, the self-corrosion current density of the coatings thermally treated at 500∘C was seven times smaller than that of the coating without heat treatment. The corrosion morphology showed that significant corrosion cracks were present on the as-sprayed coating. In contrast, the heat-treated coatings demonstrated small corrosion holes due to the formation of small corrosion galvanic cells between the precipitation of carbides and the substrate.
- Subjects
CORROSION resistance; PLASMA spraying; ELECTRIC batteries; SURFACE coatings; ELECTROLYTIC corrosion; HEAT treatment
- Publication
International Journal of Modern Physics B: Condensed Matter Physics; Statistical Physics; Applied Physics, 2022, Vol 36, Issue 12/13, p1
- ISSN
0217-9792
- Publication type
Article
- DOI
10.1142/S0217979222400525