引用本文:李姣姣,刘燕红,李家平,刘燕仪,尚伟,温玉清.自组装膜层微观结构对铝合金表面耐腐蚀性能的影响[J].中国表面工程,2020,33(5):30~39
Li Jiaojiao,Liu Yanhong,Li Jiaping,Liu Yanyi,Shang Wei,Wen Yuqing.Effects of Self-assembled Film Microstructure on Corrosion Resistance of Aluminum Alloy Surface[J].China Surface Engineering,2020,33(5):30~39
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自组装膜层微观结构对铝合金表面耐腐蚀性能的影响
李姣姣, 刘燕红, 李家平, 刘燕仪, 尚伟, 温玉清
桂林理工大学 广西电磁化学功能物质重点实验室, 桂林 541004
摘要:
为了研究具有不同官能团的自组装膜层微观结构对铝合金表面耐腐蚀性能的影响,通过自组装膜技术在铝合金表面分别制备月桂酸、双(γ-三乙氧基硅基丙基)四硫化物(BTESPT)、癸二酸铵这 3 种自组装膜层。 采用 SEM、XRD、 FT-IR 对自组装膜层进行结构表征,并分别对 3 种膜层的电化学性能和耐腐蚀性能进行研究。 结果表明,3 种分子都在铝合金表面成膜,但 BTESPT 自组装膜最为致密。 通过交流阻抗测试和极化曲线测试,3 种膜层的阻抗值分别达到了 3. 3×107 、1. 1×1015 和 6. 8×107 Ω·cm2 ,腐蚀电流密度分别为 4. 5×10-7 、5. 6×10-8 和 9. 6×10-8 A/ cm2 ,通过拟合电路分析膜层耐腐蚀机理。 盐雾试验结果显示,BTESPT 自组装膜层在第 16 天才产生腐蚀点,要优于另外 2 种自组装膜层。 分析推导认为 BTESPT 自组装膜的微观致密结构为膜层具有更优的耐腐蚀性能提供了保证。
关键词:  铝合金  月桂酸  双 (γ-三乙氧基硅基丙基) 四硫化物  癸二酸铵  自组装膜  耐腐蚀性能
DOI：10.11933/j.issn.1007-9289.20200716004
分类号:TG174.45
文章编号:1007-9289(2020)05-0030-10
文献标识码:A
基金项目:国家自然科学基金(51665010)； 广西自然科学基金项目(2020GXNSFAA159011)
Effects of Self-assembled Film Microstructure on Corrosion Resistance of Aluminum Alloy Surface
Li Jiaojiao, Liu Yanhong, Li Jiaping, Liu Yanyi, Shang Wei, Wen Yuqing
Guangxi Key Laboratory of Electrochemical and Magnetochemical Function Materials, Guilin University of Technology, Guilin 541004 , China
Abstract:
In order to study the influence of the microstructure of self-assembled films with different functional groups on the corrosion resistance of aluminum alloy. Lauric acid, bis(γ-triethoxysilylpropyl) tetrasulfide (BTESPT) and ammonium sebacate self-assembled film were prepared on the surface of Al by self-assembled film technology. Scanning electron microscope, X-ray energy spectrometer, contact angle analyzer, and infrared spectrometer were used to characterize the films, the electrochemical and corrosion protection performance of the films were discussed respectively. The results shows that the three self-assembled films all have been successfully prepared, moreover, the BTESPT film structure was densest among the films. The EIS and Tafel plot shows that the impedance values of the three layers have reached 3. 3×107 , 1. 1×1015 , 6. 8×107 Ω·cm2 , the corrosion cur- rent density reached 4. 5×10-7 , 5. 6×10-8 , 9. 6×10-8 A/ cm2 . Corrosion mechanism of the film is discussed by the fitting circuit diagram. Salt spray test results shows that the corrosion point appeared on the 16th day of the BTESPT film. A result is obtained that the BTESPT film has the best corrosion resistance due to its dense film structure.
Key words:  aluminum alloy  lauric acid  BTESPT  ammonium sebacate  self-assembled film  corrosion resistance
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