Study On The Electrolytic Polishing Liquid Formulation And Process Parameters On TC4 Titanium Alloy

Because of high specific strength and excellent corrosion resistance, titanium alloy is widely used in the aerospace, chemical industry and medical equipment and other fields. Electrolytic polishing is a more applications surface flattening process for titanium and titanium alloy. It can be applied to the metal surface decoration processing pretreatment process and independently used of deburring and finishing leveling on surface. It can guarantee the processing quality of the titanium alloy and improve processing efficiency. Therefore it becomes a key and indispensable technology of surface treatment processes.For TC4 alloy, under normal temperature, the single factor method and orthogonal test are used in the study. Solution ratio, voltage polishing and polishing time designed for the establishment of pilot programs electrochemical polishing. By single factor test to determine the optimum range of parameters,further designing orthogonal experiment to obtain optimum electrochemical processes and analysis the influence of electrochemical polishing liquid ratio and the polishing parameters on surface roughness and surface morphology.The test results show that the influence order of various process parameters on the polishing effect from the primary to the secondary: solution ratio, polishing voltage and polishing time. Under normal temperature, a certain concentration of perchloric acid-glacial acetic acid and sulfuric acid-methanol can be implemented effectively in electrochemical polishing of TC4 titanium alloy. It can make the surface roughness of TC4 titanium alloy decreased and improving the surface morphology. And the best polishing voltages in perchloric acid- acetic acid and sulfuric acid- methanol system are 85 V and 45 V, respectively optimal polishing time is 25 s and 50 s.However, compared with the sulfuric acid-methanol solution system, the surface roughness of TC4 titanium alloy by electrochemical polishing in perchloric acid-glacial acetic acid solution decreased significantly, the brightness also increased significantly, the surface quality is more uniform and smooth at the same time.