In this study, after face‐milling Al–Li alloy 2A97 under dry machining condition, the machined surface roughness S_a and S_z are dealt with statistical analyses. Then, the supplementary face‐milling trials are conducted to verify the analyses and gain the effect of the feed rate per tooth (f_z) on S_a and S_z. Lastly, the electrochemical impedance spectroscopy tests are conducted on the machined surfaces to determine their corrosion resistance. The variance analyses show that although f_z and the depth of cut are more important than the width of cut and the cutting speed, each of the four parameters is individually insignificant to S_a and S_z. Therefore, the quadratic regression models that take the interaction effects of the parameters into consideration are established. The validity of the models is proved with the comparisons between the measured and calculated S_a and S_z. The equivalent circuit models are proposed on the basis of the shape characteristics of the impedance spectra for machined surfaces. The estimations from the circuit models reveal the superiority in the corrosion resistances of face‐milled surfaces with the optimized surface roughness.

中文翻译：

---

通过降低机加工表面粗糙度来增强Al-Li合金2A97的防腐性能

在这项研究中，在干加工条件下对Al-Li合金2A97进行端面铣削后，对加工后的表面粗糙度S _a和S _z进行统计分析。然后，进行补充的平面铣削试验，以验证分析结果并获得每齿进给速度（f _z）对S _a和S _z的影响。最后，在加工过的表面上进行电化学阻抗光谱测试，以确定其耐腐蚀性。方差分析表明，尽管f _z切削深度和切削深度比切削宽度和切削速度更为重要，四个参数中的每个参数对于S _a和S _z均无关紧要。因此，建立了考虑参数交互作用的二次回归模型。通过对实测值和计算出的S _a和S _z进行比较，证明了模型的有效性。根据机加工表面阻抗谱的形状特征，提出了等效电路模型。电路模型的估算结果表明，经过优化的表面粗糙度在端面铣削表面的耐蚀性方面具有优势。