铝锂合金表面制备草酸阳极氧化膜及无铬封孔处理  

Preparation of Oxalic Acid Anodic Oxidation Film on 2099 Aluminum Lithium Alloy and Chrome-Free Sealing Treatment

作　　者：凌付平 LING Fuping(Jiangshu Shipping College,Nantong 226010,China;Nanjing University of Science and Tech‐nology,Nanjing 210094,China)

机构地区：[1]江苏航运职业技术学院,江苏南通226010 [2]南京理工大学,江苏南京210094

出　　处：《电镀与精饰》2021年第9期45-50,共6页Plating & Finishing

基　　金：江苏省高职院校青年教师企业实践培训资助项目(2020QYSJPX191);2019年度江苏航运职业技术学院科技类立项重点项目(HYKY/2019A1)。

摘　　要：为有效提高2099铝锂合金的耐腐蚀性能,在其表面制备草酸阳极氧化膜,并对氧化膜进行沸水封孔和镍盐封孔处理。表征与测试结果表明:草酸氧化膜完整覆盖了铝锂合金表面,且经过沸水封孔和镍盐封孔后氧化膜的微观形貌发生显著变化,镍盐封孔氧化膜较平整致密,孔隙率更低。沸水封孔和镍盐封孔对氧化膜的厚度基本没有影响,但是封孔后氧化膜的耐腐蚀性能显著提高。相比于沸水封孔,镍盐封孔起到双重封孔效果,能更好的填充封孔氧化膜的孔洞,所以镍盐封孔氧化膜的耐腐蚀性能更好,其电荷转移电阻和低频区间的阻抗模值(|Z|_(0.01 Hz))分别达到7.28×10^(3)Ω·cm^(2)、1.01×10^(4)Ω·cm^(2),单位面积的腐蚀失重仅为0.49 g/m^(2)。草酸阳极氧化后进行镍盐封孔,能更有效提高铝锂合金的耐腐蚀性能。Oxalic acid anodic oxidation film was prepared the surface of 2099 aluminum-lithium alloy in order to improve its corrosion resistance,and then the oxidation film was sealed with boiling water and nickel salt respectively.The characterization and test results showed that the oxalic acid oxidation film completely covered the surface of aluminum-lithium alloy,and the microstructure of the oxidation film changed significantly after sealing with boiling water and nickel salt.The nickel salt sealed oxida‐tion film was smooth and compact,and the porosity was lower.Boiling water sealing and nickel salt sealing have little effect on the thickness of oxidation film,but the corrosion resistance of oxidation film was significantly improved after sealing.Compared with boiling water sealing,nickel salt sealing play a double-sealing effect and it can better fill the holes of oxidation film,so the corrosion resistance of nickel salt sealed oxidation film was better,the charge transfer resistance and impedance modulus at low frequency range(|Z|0.01 Hz)reached 7.28×10^(3)Ω·cm^(2) and 1.01×10^(4)Ω·cm^(2) respectively,and the corro‐sion weight loss per unit area was 0.49 g/m^(2).Oxalic acid anodic oxidation and then sealed with nickel salt can effectively improve the corrosion resistance of aluminum-lithium alloy.

关 键 词：草酸阳极氧化膜 2099铝锂合金 沸水封孔 镍盐封孔 耐腐蚀性能 

分 类 号：TQ153.6[化学工程—电化学工业]