Influence of Cr Content on the Microstructure and Electrochemical Corrosion in Plasma Cladding Ni-Cr Coatings

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Ni-xCr (x = 20, 30 and 40 wt pct, respectively) alloy corrosion resistant coatings were manufactured on Q235 substrate by plasma cladding. The effects of the Cr content on the phase composition, microstructure, and corrosion resistance of the Ni-xCr coatings were investigated in detail. The results showed that the main phases of the Ni-xCr coatings were γ-[Ni, Fe] solid solutions with face-centered cubic (FCC) structure. Electrochemical corrosion tests of different polarization voltages showed that the inhomogeneous distribution of composition and the presence of the multiphase structure led to the occurrence of corrosion. The occurrence of the Cr-rich phase increased the sensitivity of the Cr-poor phase and further accelerated the corrosion process. The Ni-xCr coating with intermediate Cr content (Ni-30Cr) had the best corrosion resistance, which depends on the phase composition of the coating.

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This research was supported by Distinguished Taishan Scholars in Climbing Plan (tspd20161006), National 863 Project Plan of China (2015AA034404), and the National Natural Science Foundation of China Youth Fund Project (Grant No. 51801114).

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Correspondence to Canming Wang or Hongzhi Cui.

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Manuscript submitted May 16, 2019.

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Zhang, W., Wang, C., Song, Q. et al. Influence of Cr Content on the Microstructure and Electrochemical Corrosion in Plasma Cladding Ni-Cr Coatings. Metall Mater Trans A 50, 5410–5420 (2019).

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