The importance of phase composition for corrosion resistance and thermal oxidation behavior of gas-borided layer produced on nickel alloy

摘要

Gas bonding was used to produce the bonded layer containing a mixture of chromium and nickel borides on the Inconel (R) 600-alloy. The bonded sample was characterized by a higher corrosion potential (-0.953 V) than the non-borided sample (-1.005 V). The corrosion current density was significantly lower for the bonded sample. The oxidation at 1000 degrees C for 24 h caused the formation of different oxides on the surface of the bonded sample. Simultaneously, the presence of nickel and chromium borides was confirmed by XRD analysis after the oxidation test. It was concluded, that the gas boriding could be an effective barrier against corrosion and oxidation of Inconel (R) 600-alloy.