Dependence of Initial Surface Roughness for Treated Surface by Cathode Spots of Low Pressure Arc

Cathode spots of a low-pressure arc can remove oxide layers and evaporate impurities on metal surfaces. Removal of the oxide layer using cathode spots is expected to solve recent obstacles to chemical and mechanical cleaning methods. Various phenomena of cathode spots have been investigated for pre-treatment of atmospheric pressure plasma spray (APPS). This study addressed the dependence of initial surface roughness for treated surface by cathode spots of low pressure arc. The test pieces (SS 400) are used, and they are compared with the treated surface by cathode spots and mechanical blasted surfaces in order to know the dependence of initial surface roughness for treated surface by cathode spot of low pressure arc. Results show that the treated surface roughness on the test piece surface by low pressure arc increases with increasing the initial surface roughness at 100 Pa of atmospheric pressure. In addition, it decreases with increasing the current