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Study of hot corrosion resistance of electroless nickel coating with different content of phosphorous in molten salt deposit Na2SO4–NaCl at 650°C

Surface Engineering and Applied Electrochemistry volume 51, pages 367–373 (2015)Cite this article

Abstract

In this research, the hot corrosion behavior of electroless nickel-(4, 7, 9, and 12 wt % P) was studied in 70 wt % Na2SO4–30 wt % NaCl (3 and 6 mg/cm2) molten salt on a copper substrate. After being plated with a thickness of 25 ± 3 µm, the specimens were annealed at 400°C for 1 hour, and then the hardness of each was measured by the Vickers hardness test method. The hot corrosion test was performed at 650°C for 20 hours inside the furnace at a rate of 4°C/min under atmospheric conditions. The results showed that Ni—7 wt % P and Ni—12 wt % P electroless coatings included the highest and the lowest hot corrosion resistance, respectively. The difference in the weight increase of the hot corrosion of Ni—12 wt % P coating was about 8 times as much as that of Ni—7 wt % P, and the difference in thermal expansion between the substrate and the coating was responsible for the cracks in the coating. Diffusion of the molten salt through these cracks expanded and reached the intersection of the coating and the substrate. The results of the XRD showed the formation of NiSO4, NiO, and Cu on the coating surface after the hot corrosion test.

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Authors and Affiliations

  1. Young Researchers and Elite Club, Najafabad Branch, Islamic Azad University, Najafabad, Iran

    M. Ghaderi & M. Rezagholizadeh

  2. Materials Engineering Department, Najafabad Branch, Islamic Azad University, Najafabad, Isfahan, Iran

    H. Nasiri-Vatan & R. Ebrahimi-Kahrizsangi

Authors
  1. M. Ghaderi
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  2. M. Rezagholizadeh
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  3. H. Nasiri-Vatan
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  4. R. Ebrahimi-Kahrizsangi
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Correspondence to M. Ghaderi.

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Ghaderi, M., Rezagholizadeh, M., Nasiri-Vatan, H. et al. Study of hot corrosion resistance of electroless nickel coating with different content of phosphorous in molten salt deposit Na2SO4–NaCl at 650°C. Surf. Engin. Appl.Electrochem. 51, 367–373 (2015). https://doi.org/10.3103/S1068375515040055

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  • DOI: https://doi.org/10.3103/S1068375515040055

Keywords

  • electroless
  • Ni—P
  • molten salt
  • hot corrosion
  • hot mount