The complex protecting film composed of FeSO4, FeS, B2O3, N-B-O and O-Fe-B contributed to improve the tribological behavior of the lubricant.

• 钢球磨损表面形成了由FeSO4、FeS、B2O3、N-B-O及O-Fe-B等多组分构成的保护膜,从而使得摩擦学性能得以改善。