Dissolution Characteristics of New Titanium Alloys in Electrochemical Machining

We focus on the electrochemical dissolution characteristics of new titanium alloys such as near-α titanium alloy Ti60, α＋βtitanium alloy TC4 and 13 titanium alloy Ti40 which are often used for aerospace industry. The ex- periments are carried out by electrochemical machining tool, and the surface morphology of the specimens is ob- served by the scanning electron microscope （SEM） and three-dimensional video microscope （DVM）. The appropri- ate electrolyte is selected and the relationships between surface roughness and current density are achieved. The re- sults show that the single-phase titanium alloy Ti40 has a better surface roughness after ECM compared with the α＋β titanium alloy TC4 and the near- α titanium alloy Ti60. The best surface roughness is Ra O. 28μm when the current density is 75 A/cm2. Furthermore, the surface roughness of the near-a titanium alloy Ti60 is the most sen- sitive with the current density because of the different electrochemical equivalents of substitutional elements and larger grains than TC4. Finally, the suitable current density for each titanium alloy is achieved.