Study On The Influence Of Electrochemical Dissolution Behavior On Surface Quality Of GH4169 Alloy Investigate

Electrolytic machining is an important processing method of special processing technology.It can process any conductive workpiece material without cutting force during processing.The surface quality of the processed parts is good,there is no residual strain,burr and other defects,the tool cathode has no loss,and the processing efficiency and workpiece forming accuracy are high.It is an important special processing method for processing difficult-to-cut metal materials and complex cavities and surfaces.However,electrolytic machining is affected by many factors,the machining process is extremely complex,and it is also affected by the flow field,electric field,temperature field,and the electrochemical dissolution characteristics of the workpiece anode.Therefore,it is of great significance to deeply explore the regular changes of various physical fields and the anode of the workpiece during the electrolytic machining process,and to optimize the electrolytic machining parameters.In order to explore the influence of various factors on electrolytic machining,this paper selected GH4169 nickel-based superalloy as the workpiece anode,and explored the electrochemical dissolution characteristics of metal anodes in different electrolytes.Taking a certain type of blade fixture designed by our research group as the object,the influence of flow field and electric field on electrolytic machining was explored.The main research contents are as follows.In this experiment,Na Cl and Na₂SO₄ solutions were selected as the electrolyte,and a total of 10 experimental programs with different concentrations and temperatures were set up to ensure more detailed data.The electrical conductivity,polarization curves and electrochemical impedance spectra of nickel-based superalloys in two electrolytes were analyzed.It can be seen that the efficiency of electrolytic machining in Na Cl electrolyte is higher,the current density is higher,and the current density of Na₂SO₄ is smaller,the efficiency of electrolytic machining is low,and the machining is relatively stable.The electrochemical impedance spectra of electrolytes with different temperatures and concentrations were measured.Through the analysis of the data,it is found that the anode workpiece is more likely to form a passivation film in the Na₂SO₄ electrolyte than in the Na Cl electrolyte,which hinders the electrochemical reaction.The change of electrolyte concentration does not have obvious influence on the passivation film,but the change of temperature has more obvious influence on the passivation film.By analyzing the experimental data and comprehensively considering the practical factors,the more suitable electrolytic machining parameters are obtained.Considering that the distribution law of the flow field and the electric field also has an important influence on the electrolytic machining process,this experiment explores the distribution law of the electric field and the flow field during the machining process with a three-dimensional modeling of a certain type of blade fixture.There are 4 different hydraulic pressures designed at the inlet of the runner,and 4 different feed rates,a total of 16 states.The results show that the inlet hydraulic pressure is 0.7MPa,and the electrolyte flow in the machining gap is uniform when the inlet hydraulic pressure is0.8MPa,and there is no eddy current and poor liquid zone.Figure[48]Table[9]Reference[80]...