In order to clarify the direct impact characteristics of pulsed arc discharge plasma channel in water

a steel plate were employed as an impacted object

the micro-ultrasound technology was used to analyze the area and distribution of pitting corrosion on the impacted plate surface under different discharge conditions

and the passive measurement as well as simulation methods was adopted to study the characteristics of impact pressure on a steel plate exerted by the plasma channel. Results show that

at the discharge gap of 5 mm

the impact sites distribute in a circular region with a 5 mm radius centered at the plate midpoint

and the maximum impact pressure along with impact area increases with the discharge voltage. Moreover

under the condition of 20 kV discharge voltage

the impact sites distribution becomes disperse

the impact area decreases with the increase of the discharge gap

the discharge gap for the maximum impact pressure is 10 mm

and the pressure value is about 34 MPa. The study enhances the understanding of the direct impact characteristics of pulsed arc discharge plasma channel in water and provides references for its effective applications.