Cavitation erosion test of copper-bearing antibacterial duplex stainless steel in artificial seawater was carried out by using a magnetostrictive cavitation test machine

and the cumulative loss weight and weight loss curve were measured by weight loss.The cavitation erosion mechanism was analyzed by OM

ESEM

EDS

XRD and so on.The results reveal that the cavitation erosion of the copper-bearing antibacterial duplex stainless steel after aging treatment at 560 ℃is divided into initial period

accelerated period

decreased period and stable period.Compare with the base material

the cavitation damage of copper-bearing antibacterial duplex stainless presents more serious.After 50 h

the weight loss of corrosion resistance of antibacterial materials and solution material reach 2.5 mg and 4.2 mg

respectively

and the cavitation damage of copper-bearing antibacterial duplex stainless steel after antibacterial aging is reduced.The fine and dispersion Cu-rich phase in antibacterial material can enhance the cavitation erosion resistance of ferrite

however the crystal structure of austenite and the sliding hindrance caused by internal dislocation determine that the cavitation erosion resistance is the higher than the ferrite with Curich phase.The micro-hardness of the antibacterial material and solution material is increased with the increase of cavitation time

however

the hardness value of antibacterial material is always higher than that of solid solution ones due to the dispersion of aging precipitation and rich Cu phase.