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目的研究响应面法在优化2A97铝锂合金最佳化铣液配方中的可行性。方法在传统铝合金化铣氢氧化钠、硫化钠、三乙醇胺及溶解铝溶液体系,探索2A97铝锂合金化学铣切工艺,研究化铣液配方对2A97铝锂合金表面质量的影响,从而优化工艺参数并获得最佳化铣工艺。在单因素试验的基础上,以表面粗糙度为响应值,应用响应面法中的Box-Behnken设计四因素(氢氧化钠、硫化钠、三乙醇胺及溶解铝浓度)三水平试验,通过回归分析,得到了化铣液各组分参数对响应值的影响规律,并且通过优化分析得到了最佳2A97铝锂合金化铣液配方。结果通过响应面设计试验分析可得,当2A97铝锂合金化铣液配方为氢氧化钠130 g/L、硫化钠15 g/L、三乙醇胺50 g/L、溶解铝70 g/L时,采用该化铣液对2A97铝锂合金试样进行化铣,得到的试样表面平整一致,腐蚀速度为0.031 mm/min,粗糙度Ra=1.36μm,无晶间腐蚀及点蚀等缺陷。结论拟合模型决定系数R~2=0.967 927,说明模型的拟合性良好,可以采用响应面法对2A97铝锂合金化铣工艺进行分析,具有一定的参考价值。
Objective To study the feasibility of response surface methodology in optimizing formulation of 2A97 Al-Li alloy milling solution. Methods In the conventional aluminum alloy milling system of sodium hydroxide, sodium sulfide, triethanolamine and dissolved aluminum, 2A97 Al-Li alloy milling technology to explore the milling formula on the surface quality of 2A97 Al-Li alloy, so as to optimize the process Parameters and get the best milling technology. Based on the single factor experiment, the four factors (sodium hydroxide, sodium sulfide, triethanolamine and dissolved aluminum concentration) were designed by the Box-Behnken response surface method with the surface roughness as the response value. Through regression analysis , The influence law of the components of the milling solution on the response value was obtained, and the optimal 2A97 Al-Li alloying solution was obtained through optimization analysis. Results Through the response surface design and experimental analysis, when 2A97 Al-Li alloy milling solution was formulated with sodium hydroxide 130 g / L, sodium sulfide 15 g / L, triethanolamine 50 g / L and aluminum 70 g / L, The milling solution of 2A97 Al-Li alloy was used for milling. The surface of the sample was smooth and uniform. The corrosion rate was 0.031 mm / min, the roughness Ra = 1.36 μm, intergranular corrosion and pitting corrosion. Conclusions The fitting coefficient of the model is R ~ 2 = 0.967 927, which shows that the fitting of the model is good. The response surface method can be used to analyze 2A97 Al-Li alloy milling process, which has some reference value.