Corrosion behavior of YSZ and YSZ/NiCo coatings on inconel 625 exposed alkali chlorides


  • Resetiana Dwi DESIATI Research Center for Advanced Materials, National Research and Innovation Agency
  • Eni SUGIARTI Research Center for Advanced Materials, National Research and Innovation Agency
  • Bambang HERMANTO Research Center for Advanced Materials, National Research and Innovation Agency
  • Gerald Ensang TIMUDA Research Center for Advanced Materials, National Research and Innovation Agency
  • Hubby IZZUDDIN Research Center for Advanced Materials, National Research and Innovation Agency
  • Fraya Aulia SALSABILLA Department of Physics, Faculty of Science and Technology, Syarif Hidayatullah State Islamic University Jakarta
  • Anawati ANAWATI Department of Physic, Faculty of Mathematics and Natural Science, Universitas Indonesia



YSZ, Electrophoretic Deposition, alkali chlorides, hot salt corrosion


Alkali chloride attack on boiler pipe walls is considered the main problem of corrosion in the waste-to-energy (WTE) industry, even though uses superalloy. Electrophoretic deposited (EPD) yttria-stabilized zirconia (YSZ) coating is carried out to protect the Inconel 625 substrate. YSZ is deposited directly both on the Inconel 625 substrate and NiCo-Inconel 625. Corrosion resistance was conducted using the 3.5% NaCl electrochemical test and the hot salt corrosion test at 600°C in alkaline salt media such as NaCl, KCl, and CaCl2. The potentiodynamic polarization curve shows that the YSZ coating deposited on the substrate (single-layer) has a corrosion rate of 0.065 mm∙y‒1, lower than that deposited on NiCo coating (double-layer). The double-layer, NiO2 is formed in the NiCo layer due to the NaCl solution being trapped. Meanwhile, in hot salt corrosion at 600°C, CaCrO4 is formed as a protective oxide layer. Furthermore, in the double-layer, an imperfect oxide layer is formed causing spallation and coating failure. The corrosion rate for single-layer hot salt corrosion for 40 h is 0.310 mm∙y‒1. As a result, the corrosion resistance of the single-layer is increased by the presence of the Cr2O3 oxide layer formed during sintering.


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How to Cite

R. D. . DESIATI, “Corrosion behavior of YSZ and YSZ/NiCo coatings on inconel 625 exposed alkali chlorides ”, J Met Mater Miner, vol. 34, no. 2, p. 1879, Jun. 2024.



Original Research Articles