• H B YANG

      Articles written in Bulletin of Materials Science

    • Improved thermal stability and oxidation resistance of electrodeposited NiCrP amorphous alloy coatings

      Y Q GUO J K YU H B YANG Q QIAO Q Y LI X C ZHAO

      More Details Abstract Fulltext PDF

      Amorphous NiP and NiCrP alloy coatings were prepared on copper substrates by electrodeposition. The thermal stability of the obtained coatings were evaluated by the onset temperature of phase transformation identified with differential scanning calorimetry measurements, and their high temperature oxidation resistances were characterized by the oxidation kinetics curve and the oxidation activation energy. The mechanism of the doping effect of Cr element on crystallization temperature and oxidation resistance of the alloy coatings were discussed based on X-ray diffraction analysis. The results show that the crystallization temperature of NiP amorphous alloy was 344$^{\circ}$C, and the oxidation activation energy was calculated to be 1.54 $\times$ 103 J mol$^{−1}$. As for NiCrP alloy coating with a Cr content of 1.8 wt%, the crystallization temperature increased to 403.8$^{\circ}$C and the calculated oxidation activation energy was 3.53 $\times$ 104 J mol$^{−1}$, 2.29 times higher than theNiP coating. The remarkably enhanced high-temperature oxidation resistance of NiCrP alloy coating can be attributed to the compact metal oxide film formed on the surface.

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      Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
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      Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
      Physical Sciences 2020

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      Posted on July 25, 2019

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