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The cathode spots of the low pressure arc can remove the oxide layer and evaporate impurities on the metal surface. The removal of the oxide layer by using the cathode spots is expected to solve the recent problems of the chemical and mechanical cleaning methods. The phenomena of the cathode spots for pre-treatment of Atmospheric Pressure Plasma Spray (APPS) have been investigated. In this paper, the surface shapes of oxide and non-oxide work pieces were treated by using a cathode spot only, a blast only and a composite pre-treating method: the cathode spots after grit blasting. In addition, they are compared with conventional cathode spots treated and mechanically blasted surfaces. As the results, the roughness on the surface of work pieces is arisen with the initial oxide layer thickness. It reveals the factors dominating bonding strength on the surface pre-treated by using the cathode spots of the low pressure arc. The bonding strength increases with the arithmetical mean height of the surface roughness due to the initial oxide layer thickness. The bonding strength is raised when the average length of outline curve element becomes narrow. The bonding adhesive strength treated by the cathode spots after the grit blasting is over 90 MPa. The main results are shown below. (1) The roughness on the surface of work pieces is arisen with the initial oxide layer thickness. The surface height has the maximum value at the final removal moment of oxide layer. Therefore, it is considered the bonding or adhesive strength of the sprayed surface becomes the maximum in such a condition. (2) It reveals the factors dominating bonding strength on the surface pre-treated by using the cathode spots of the low pressure arc. (3) The bonding strength increases with the arithmetical mean height of the surface roughness due to the initial oxide layer thickness. (4) When the arithmetical mean height of the surface pretreated by using the cathode spots is the same, the bonding strength is raised when the average length of outline curve element becomes narrow. (5) The bonding adhesive strength treated by the cathode spots after the grit blasting is over 90 MPa, over twice as times as previous treatment such as only the cathode spots or grit blasting. Fig. 1. Bonding strength for arithmetical mean height by each pre-treatment

Effect of Surface Treatment by Cathode Spot of Low Pressure Arc on Bonding Strength of Spraying Film by APPS