Optimization of chemical milling process and improvement of surface quality for 2060 aluminum-lithium alloy
In order to solve the problem of high surface roughness caused by the rapid dissolution of lithium-containing phase in the process of chemical milling for aluminum-lithium alloy,the effects of Na2CO3 and benzene ring additive RA-8 on the milling speed,surface roughness and dissolution behavior of 2060 aluminum-lithium alloy are studied by means of three-dimensional microscopy and potentiodynamic polarization test,and the chemical milling formula is optimized.The results show that Na2CO3 alone can already inhibit the dissolution of lithium-containing phases,and its synergistic effect with RA-8 can further improve the surface quality,meanwhile their effect on the milling speed is small.For 2060 aluminum-lithium alloy,the optimal milling parameters are:NaOH 160 g/L,Na2S 30g/L,triethanolamine(TEA)50 g/L,Na2CO3 0.5 mol/L,RA-8 0.4 g/L,Al3+0‒70 g/L,and 90℃.Under this condition,the surface roughness(Ra)of 2060 aluminum-lithium alloy treated by chemical milling is 0.95 μm‒1.21 μm,and the corrosion rate is 20 μm‒50 μm/min.
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