Electric contact strengthening to improve the bonding between thermally sprayed 316 stainless steel coating and 45# steel substrate

摘要

An electric contact strengthening method employed to improve the bonding between thermally sprayed 316 stainless steel coating and its 45# steel substrate was investigated. The thickness of the 316 stainless steel coating was about 0.2 mm. The bonding properties between the 316 stainless steel coating and the 45# steel substrate were observed through Zeiss Axiovert MAT optical microscopy. The cross-section view of X-ray diffraction pattern of the metallographic samples was investigated by using D/max-2550PC X-ray diffraction (XRD). The main factors affecting the diffusion of the elements between the 316 stainless steel coating and the 45# steel cylinder are current, rotation speed of the specimens, electrode force on the workpiece, and the flow rate of the coolant. Current has the greatest effect on the diffusion of elements between the 316 stainless steel coating and the 45# steel substrate. The better strengthening effect could be achieved with the use of a higher current.