Study on Chemical Milling Process of 2A97 Al-Li Alloy
The surface roughness,fatigue property and microscopic defects evolution of 2A97 aluminum-lithium alloy sheet,which was milled by three different milling fluids,were studied by high frequency fatigue testing,optical microscopy and scanning electron microscope.The results show that compared with the milling fluid without sodium sulfide or triethanolamine,the milling fluid with sodium sulfide and triethanolamine simultaneously can get better milling performance.The surface of the material after chemical milling is smooth with less and smaller microscopic defect.The surface roughness is Ra≤1.6 μm,and the fatigue life is up to 3.71×105 N;the addition of sodium sulfide and triethanolamine can effectively alleviate the local corrosion of the alloy.The surface of aluminum alloy can be more evenly corroded,and the microscopic defects can be less and smaller,so it can achieve better surface roughness and fatigue property.
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