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以Ce(NO3)3和KMnO4为主盐,NaF为促进剂,在6063铝合金上制备Ce-Mn转化膜.分别采用扫描电子显微镜(SEM),显微能谱分析仪(EDS)和X-射线光电子能谱仪(XPS),研究Ce-Mn转化膜的形貌,成分和元素价态.结果显示Ce-Mn转化膜在6063铝合金表面生成,膜主要由铈(三价和四价)和锰(四价)的氧化物和氢氧化物组成.室温时在3.5%NaCl水溶液中,采用动电位极化曲线(Tafel)和交流阻抗(EIS)研究Ce-Mn转化膜的耐腐蚀能力,结果表明经Ce-Mn转化液处理后,铝合金的腐蚀电流密度从1.929μA/cm2下降到0.0916μA/cm2,铝合金表面膜电阻从10kΩ·cm2增加到200kΩ·cm2,Ce-Mn转化膜具有很好的耐腐蚀能力,达到Cr(+3)转化膜的水平.
Ce-Mn conversion coatings were prepared on 6063 aluminum alloy by using Ce (NO3) 3 and KMnO4 as main salts and NaF as accelerator, respectively. Scanning electron microscopy (SEM), Microanalyser (EDS) X-ray photoelectron spectroscopy (XPS) was used to investigate the morphology, composition and elemental valence of Ce-Mn conversion coatings.The results show that the Ce-Mn conversion coating is formed on the surface of 6063 aluminum alloy and the films mainly consist of cerium (trivalent and tetravalent) And manganese (tetravalent) oxides and hydroxides.The corrosion resistance of Ce-Mn conversion coatings was investigated by potentiodynamic polarization curves (Tafel) and alternating current impedance (EIS) in 3.5% NaCl aqueous solution at room temperature, The results showed that the corrosion current density of the aluminum alloy decreased from 1.929μA / cm2 to 0.0916μA / cm2 and the surface resistance of the aluminum alloy increased from 10kΩ · cm2 to 200kΩ · cm2 after the Ce-Mn conversion solution was treated. The Ce-Mn conversion coating had Very good corrosion resistance, to Cr (+3) conversion film level.