Electrochemical and tribological properties of different NbMoSiN composite- and gradient- films in simulated body fluids.

NbMoSiN composite and gradient films were deposited by magnetron sputtering with nitrogen flow design, and their structural, electrochemical and tribological behaviors in simulated body fluids were investigated. The results revealed that the NbMoSiN composite film composed β -Nb 2 N, MoSi 2 nanocrystals, Si 3 N 4 , and amorphous phases, while the NbMoSiN gradient film was completely amorphous. The film with 30 sccm nitrogen flow demonstrated enhanced corrosion resistance, attributed to the increased MoSi 2 and Si 3 N 4. The gradient film exhibited poor passivation ability and compositional inhomogeneity, leading to accelerated corrosion. The film's wear rate at 10 sccm nitrogen flow was significantly lower due to the hard nitride phase and multiphase interface strengthening. Higher nitrogen flow increased the silicide phase and reduced the friction coefficient through hydration. • NbMoSiN composite and gradient films were deposited by DC magnetron sputtering. • Tribological and anticorrosion mechanisms in simulated body fluids were discussed. • The hydration lubrication at the wear track resulted in a lower friction coefficient. • This study provides a potential method for surface modification of 316 L implants. [ABSTRACT FROM AUTHOR]