硫酸阳极化对2E12铝合金力学性能的影响  

Effect of Sulfuric Acid Anodizing on Mechanical Properties of 2E12 Al-alloy

作　　者：陈高红 胡远森 于美[2] 刘建华[2] 李国爱 CHEN Gaohong;HU Yuansen;YU Mei;LILT Jianhua;LI Guoai(Beijing Engineering Research Center of AclvancedAluminum Alloys andApplicatiohs,Beijing Institute of Aeronautical Materials,Beijing 100095,China;School of Materials Science and Engineering,Beihang University,Beijing 100191,China)

机构地区：[1]北京航空材料研究院北京市先进铝合金材料及应用工程技术研究中心,北京100095 [2]北京航空航天大学材料科学与工程学院,北京100191

出　　处：《中国腐蚀与防护学报》2018年第6期579-586,共8页Journal of Chinese Society For Corrosion and Protection

摘　　要：采用传统的硫酸阳极氧化工艺对2E12航空铝合金进行处理,在铝合金表面制备了一层阳极氧化膜。研究了表面包铝层和阳极氧化时间对铝合金氧化膜表面形貌和硬度的影响,并探讨了硫酸阳极氧化处理对铝合金拉伸性能和疲劳性能的影响规律及机制。结果表明,2E12铝合金基体中的第二相在阳极氧化过程中会发生溶解,使得氧化膜表面出现孔洞。随着氧化时间的延长,氧化膜的厚度逐渐增加,孔洞数量也增多且尺寸变大。2E12铝合金经硫酸阳极氧化处理后,拉伸性能基本保持不变,但疲劳寿命出现明显下降。其中,去除包铝层的2E12铝合金经阳极氧化后,疲劳寿命最高下降到阳极氧化前的30%。硫酸阳极氧化处理后,疲劳裂纹起源于氧化膜表面的缺陷处,疲劳断口呈现多个裂纹源的特征。2E12 Al-alloys without and with an Al-clad layer were treated via the traditional sulfuric acid anodizing process, so that an anodic oxide film was prepared on their surface. The effect of the Al-clad layer and anodic oxidation time on the surface morphology and mechanical properties of the anodic oxide films was investigated by means of morphological characterization, tensile property test and fatigue life test. The results showed that the dissolution of the second phase in the matrix of 2E12 Al-alloys can result in the formation of voids on the surface oxide film during the anodic oxidation process. With the increasing oxidation time, the thickness of the oxide film gradually increases, whilst the number and size of voids also increase. After sulfuric acid anodizing, the tensile property of 2E12 Al-alloy keeps basically unchanged, but the fatigue life decreases obviously. For the sulfuric acid anodized 2E12 Al-alloy without Alclad layer, the fatigue life decreases to 30% of that for the counterpart. After the anodic oxidation treatment, the fatigue cracks originate from the defects of the oxide film surface, and the fatigue fracture shows multiple crack characteristics.

关 键 词：航空铝合金 硫酸阳极氧化疲劳寿命包铝层 

分 类 号：TG174.451[金属学及工艺—金属表面处理]