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.
关键词
镍基单晶叶片/化铣剂/化铣/DD5合金
Key words
nickel-based single crystal blade/chemical milling agent/chemical milling/DD5 alloy
万方数据