[XPS characterization of auto-reconditioning layer on worn metal surfaces].
An auto-reconditioner package for in situ reconditioning of worn surfaces of machinery parts under normal running was applied to diesel engines of DF locomotives. A reconditioning layer was generated on the cylinder bore after running a mileage of 300,000 km, and no wear was measured for the piston rings and cylinder bores. Evaluations with SEM, nanohardness tester and XPS indicated that the protective layer assumed a thickness of 8-10 microm, a nano-hardness twice as high as that of the cast iron substrate, and a main elemental composition of Fe, O and C corresponding to the existence of Fe3O4 and Fe3C. A possible formation mechanism of the protective layer was suggested based on the mechanochemical activation of metal surfaces and the catalytic activation of the auto-reconditioner molecules.
Yang
He
H
State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China.
Zhang
Zheng-ye
ZY
Li
Sheng-hua
SH
Jin
Yuan-sheng
YS
D002244:Carbon / Q000737:chemistry; D005290:Ferric Compounds / Q000737:chemistry; D006244:Hardness; D007501:Iron / Q000737:chemistry; D008422:Materials Testing; D008670:Metals / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D010100:Oxygen / Q000737:chemistry; D056951:Photoelectron Spectroscopy / Q000379:methods*; D013499:Surface Properties
D005290:Ferric Compounds; D008670:Metals; C000499:ferric oxide; D002244:Carbon; D007501:Iron; D010100:Oxygen