硫酸-磷酸脉冲阳极化对TC4钛合金力学性能的影响  

Effect of sulfuric acid-phosphoric acid pulse anodization on mechanical properties of TC4 titanium alloy

作　　者：贾天一 梁加宽 王祥宁 李振 冯小珍 詹中伟 葛玉麟 JIA Tianyi;LIANG Jiakuan;WANG Xiangning;LI Zhen;FENG Xiaozhen;ZHAN Zhongwei;GE Yulin(AECC Beijing Institute of Aeronautical Materials,Beijing 100095,China;AECC South Industry Co.,Ltd.,Zhuzhou 412000,China)

机构地区：[1]中国航发北京航空材料研究院,北京100095 [2]中国航发南方工业有限公司,湖南株洲412000

出　　处：《电镀与涂饰》2025年第4期69-74,共6页Electroplating & Finishing

摘　　要：[目的]研究硫酸-磷酸脉冲阳极氧化膜厚度对TC4钛合金力学性能的影响。[方法]以退火态TC4钛合金为基材,依据航空行业标准HB/Z 347-2002《钛及钛合金阳极氧化工艺及质量检验》制备了厚度为2~3μm和8~10μm的阳极氧化膜层,通过扫描电子显微镜(SEM)和激光共聚焦显微镜(LCM)分析了膜层的形貌和表面粗糙度,对比了不同厚度膜层与TC4钛合金基材的显微硬度、耐磨性、拉伸性能及疲劳性能。[结果]随着膜层厚度增大,氧化膜表面孔洞减小,显微硬度和表面粗糙度增大,并且厚膜试样的耐磨性显著优于薄膜试样和空白基材;两种厚度膜层对TC4钛合金拉伸性能的影响都较小,但对疲劳性能的影响显著,其中8~10μm膜层试样的中值疲劳寿命较基材下降45%,主要归因于膜层内应力累积导致的微裂纹及膜/基界面孔洞。[结论]硫酸-磷酸脉冲阳极氧化工艺可显著提升TC4钛合金的硬度和耐磨性,但厚膜层会因应力集中问题严重损害疲劳性能,实际应用中需权衡膜层厚度与服役条件。[Objective]To study the effects of thickness of pulse anodic oxide film obtained in sulfuric-phosphoric acid electrolyte on the mechanical properties of TC4 titanium alloy.[Method]Anodic oxide films with thicknesses of 2-3μm and 8-10μm were prepared respectively on annealed TC4 titanium alloy according to the aviation industry standard HB/Z 347-2002 Process and Quality Inspection for Titanium and Titanium Alloy Anodizing.The surface morphology and roughness of films were characterized by scanning electron microscopy(SEM)and laser confocal microscopy(LCM).The microhardness,wear resistance,tensile properties,and fatigue performance of the anodized specimens were compared with those of the bare substrate.[Result]With the increasing of film thickness,the micropores on the surface of anodic oxide film was decreased,while the microhardness and surface roughness was significantly increased.The thick film(8-10μm)specimens exhibited superior wear resistance to both the thin film(2-3μm)specimens and the bare substrate.The thickness of anodic oxide film had little impact on the tensile properties of TC4 alloy,but significantly affected its fatigue property.Notably,specimens with 8-10μm thick anodic oxide film showed a 45%reduction in median fatigue life compared to the bare substrate primarily due to the microcracks and voids at the film/substrate interface caused by accumulated internal stresses.[Conclusion]The sulfuric-phosphoric acid pulse anodizing process can significantly enhance the hardness and wear resistance of TC4 titanium alloy.However,thick films severely degrade fatigue performance due to stress concentration,necessitating a careful balance between film thickness and service conditions in practical applications.

关 键 词：钛合金 脉冲阳极氧化 膜层厚度 力学性能 耐磨性 疲劳性能 

分 类 号：TG178[金属学及工艺—金属表面处理]