Effect of Ultrasonic Rolling Extrusion Static Pressure on Corrosion Resistance of GCr15 Bearing Steel
HUANG Jian
YE Zixin
DU Jiaran
MA Xiqiang
JIN Dongliang
Abstract：The corrosion resistance of GCr15 bearing steel,a critical material for bearings,is a key determinant of equipment service life.This study investigated the effect of static pressure during ultrasonic rolling extrusion on the corrosion resistance of GCr15 steel.Electrochemical tests and microstructural characterization of samples processed under different static pressures revealed that as the static pressure increased,the linear polarization resistance rose,the corrosion current density decreased,and both the impedance modulus and charge transfer resistance increased,collectively indicating enhanced corrosion resistance.Microstructural analysis demonstrated that the passivation film formed at 200 N primarily consisted of Fe hydroxide and Fe2O3,whereas at 500 N,it was dominated by Fe2O3 and Fe3O4.Furthermore,the thickness and density of the passivation film increased significantly with increasing static pressure.The comprehensive results confirm that ultrasonic rolling extrusion treatment effectively improves the corrosion resistance of GCr15 steel,with the sample treated at 500 N static pressure exhibiting the optimal performance.
Keywords：ultrasonic rolling extrusionstatic pressureelectrochemical corrosionmicrostructure
Publication Date：2026-02-25
Online Publishing Date：2026-03-19(First online date of this platform, not the publication date of the document)
Pages：8( 34-41 )