2060铝锂合金化学铣切工艺优化及表面质量改善  

Optimization of chemical milling process and improvement of surface quality for 2060 aluminum-lithium alloy

作　　者：赵超 王帅星[1] 王辉庭 黄勇 吴宁 杜楠[1] Zhao Chao;Wang Shuaixing;Wang Huiting;Huang Yong;Wu Ning;Du Nan(School of Materials Science and Engineering,Nanchang Hangkong University,Nanchang 330063,China;AVIC Jiangxi Hongdu Aviation Industry Group Co.,Ltd.,Nanchang 330096,China)

机构地区：[1]南昌航空大学材料科学与工程学院,江西南昌330063 [2]航空工业洪都航空工业集团有限责任公司,江西南昌330096

出　　处：《电镀与精饰》2024年第7期38-43,共6页Plating & Finishing

摘　　要：针对铝锂合金化铣过程中含锂相的溶解过快导致表面粗糙度高的问题,借助三维显微镜、动电位极化测试等手段研究了Na_(2)CO_(3)及苯环类添加剂RA-8对2060铝锂合金化铣速度、表面粗糙度及溶解行为的影响,优化了化铣配方。结果表明:单一Na_(2)CO_(3)即可抑制含锂相的溶解,其与RA-8的协同作用可进一步改善表面质量,且对化铣速度的影响较小;针对2060铝锂合金,较优的化铣参数为:NaOH 160 g/L,Na_(2)S 30 g/L,三乙醇胺(TEA) 50 g/L,Na_(2)CO_(3)0.5 mol/L,RA-8 0.4 g/L,Al^(3+)0~70 g/L,温度为90℃。在此条件下化铣试样表面粗糙度(R_(a))为0.95~1.21μm,腐蚀速度为20~50μm/min。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 Na_(2)CO_(3) 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 Na_(2)CO_(3) 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,Na_(2)S 30 g/L,triethanolamine (TEA) 50 g/L,Na_(2)CO_(3) 0.5 mol/L,RA-8 0.4 g/L,Al^(3+)0-70 g/L,and 90℃.Under this condition,the surface roughness (R_(a)) of 2060 aluminum-lithium alloy treated by chemical milling is 0.95μm-1.21μm,and the corrosion rate is 20μm-50μm/min.

关 键 词：2060铝锂合金 添加剂 化铣加工 表面粗糙度 

分 类 号：TG146[一般工业技术—材料科学与工程]