Influence of deep-sea hydrostatic pressure on the tribocorrosion behavior and mechanism of La2O3–TiB2–Ni coating

Abstract

To understand the tribocorrosion mechanism of TiB₂–Ni coating doped with La₂O₃ in the deep ocean, the wear and corrosion test of La₂O₃–TiB₂–Ni under various hydrostatic pressures was conducted and discussed in 3.5 wt % NaCl solution. The results indicate that the tribocorrosion mechanism of the La₂O₃–TiB₂–Ni coating transitions from abrasive wear with corrosion under 0.1 MPa to abrasive wear with corrosion and adhesive wear under high hydrostatic pressure. The La₂O₃–TiB₂–Ni coating shows significant enhancements in wear resistance and anti-friction properties compared to the TiB₂–Ni coating. As the hydrostatic pressure increases from 0.1 MPa to 30 MPa, the self-corrosion current density experiences an approximate increase of 43.6 μA/cm².