LY12铝合金NaOH介质电解着色膜耐蚀性的电化学评价  

ELECTROCHEMICAL ELEVATION OF CORROSION RESISTANCE OF OLIVE-GREEN FILM ON LY12 Al ALLOY PREPARED IN NaOH

作　　者：唐子龙[1,2] 刘哲[1] 

机构地区：[1]天津大学材料科学与工程学院,天津300072 [2]天津大学天津市材料复合与功能化重点实验室,天津300072

出　　处：《中国腐蚀与防护学报》2010年第1期25-28,34,共5页Journal of Chinese Society For Corrosion and Protection

基　　金：国家自然科学基金项目(50671072)资助

摘　　要：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 A1 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 4μm in thickness,is mainly composed byα-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.

关 键 词：着色膜 伪装色 耐蚀性能 电化学评价 构效关系 

分 类 号：TG174[金属学及工艺—金属表面处理]