Fabrication and Supercritical Water Corrosion Resistance of TiN/TiNC/AlO Multilayer Coating on Inconel 625 Alloy by CVD Method.

A TiN/TiNC/AlO multilayer coating was deposited on an Inconel 625 alloy by the chemical vapor deposition method as a protective barrier to improve the corrosion resistance in supercritical water. The corrosion characteristics were evaluated in a reactor at 500 °C and 25 MPa for 72 h. The surface morphology of the coated samples was relatively dense with no obvious cracks or pores observed.