Study on H2SO4-FeCl3Chemical Milling Agent and Its Technology for Nickel-Based Single Crystal Blades
In this paper,the formulation of H2SO4-FeCl3 chemical milling agent and its ability to mill DD5 single crystal superalloy were investigated,and the weight loss rate and OM,SEM,EDS and AFM characterization means were used to analyze the chemical milling effect and ability of the chemical milling agent.The results indicate that the appropriate conditions for preparation of H2SO4-FeCl3 chemical milling agent is of 4.8 mol·L-1 concentration of H2SO4,of 0.16 mol·L-1 concentration of FeCl3,and their volume ratio 4∶1.The chemical milling agent can rapidly corrode the Ni and Al elements in DD5 single crystal cast alloy,but is slow corrosion to the Mo,W,Ta and Re elements in alloy.At room temperature,the milling is more uniform,the surface layer formed a rich Cr and Co corrosion-resistant oxides,Cr and Co corrosion ability is weaker;at a high temperature of 70℃,the milling agent has a stronger corrosion ability of Cr and Co elements,the milling rate is significantly increased.
nickel-based single crystal bladechemical milling agentchemical millingDD5 alloy
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