在弱碱性介质中阳极氧化制备LY12铝合金着色膜,用动电位扫描法极化曲线和极化电阻电化学测试技术方法研究了着色膜在中性和酸性介质中的耐蚀性能以及时效腐蚀行为.结果表明,着色膜在中性和酸性介质中均具有良好的钝化性能,耐孔蚀性能也显著提高.结合X射线衍射、表面形貌和电子能谱探讨橄榄绿色膜层的成分和结构对其耐蚀性能的影响.研究表明,着色膜的厚度约为4μm,主要由刚玉结构的α-Al_2O_3构成,膜内富集氧和其它耐蚀元素有利于耐蚀性的提高.
Corrosion performance of olive green film on LY12 Al alloy,prepared electrolytically in 0.2 mol/L NaOH at room temperature,is evaluated by electrochemical techniques including dynamical potential anodic polarization curve and polarization resistance.Good passivity of the color film in both acid and neural media and pitting resistance are demonstrated according to the results.Moreover,the color film also shows good longterm corrosion resistance in various aggressive corrosion solutions.The structure,composition and morphology of the color film are analyzed with the help of X-ray diffraction(XRD),scanning electron microscopy(SEM)and energy dispersive spectroscopy(EDS).The color film,a little more 4 μm in thickness,is mainly composed by α-alumina based on XRD.The enrichment of O and other corrosion-resistance elements inside film benefits the corrosion performance of LY12 alloy,also helps the stabilization of film color.
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