硫酸浓度对2024铝合金表面陶瓷膜组织和性能的影响  

Effect of Sulfuric Acid Concentration on the Microstructure and Properties of Ceramic Coating on the Surface of 2024 Al Alloy

作　　者：王博文 阳建君 范才河[1,3] 倪雨朦 欧玲 孙斌[1] 董世运 WANG Bowen;YANG Jianjun;FAN Caihe;NI Yumeng;OU Ling;SUN Bin;DONG Shiyun(College of Materials and Advanced Manufacturing,Hunan University of Technology,Zhuzhou Hunan 412007,China;National Key Laboratory for Remanufacturing,Academy of PLA Armored Forces Engineering,Beijing 100072,China;Anhui Jianye Science and Technology Co.,Ltd.,Technology Center,Huaibei Anhui 235000,China)

机构地区：[1]湖南工业大学材料与先进制造学院,湖南株洲412007 [2]中国人民解放军陆军装甲兵学院装备再制造技术国防科技重点实验室,北京100072 [3]安徽建业科技有限公司技术中心,安徽淮北235000

出　　处：《包装学报》2022年第3期20-28,共9页Packaging Journal

基　　金：国防科技重点实验室基金资助项目(6142005200305);湖南省创新型省份建设专项项目(2021ZK4267)。

摘　　要：将高强韧2024铝合金分别在质量浓度为100,200,300 g/L的硫酸溶液中进行60 min的表面陶瓷化处理后,在2024铝合金表面原位生成一层陶瓷膜层。对陶瓷膜层的显微组织、膜层厚度、显微硬度以及电化学性能等进行研究。研究结果表明:随着硫酸质量浓度的增加,陶瓷膜层显微硬度先增加后减少,当硫酸质量浓度为200 g/L时,陶瓷膜层显微硬度最大,为273.7 HV;而陶瓷膜层厚度受硫酸浓度影响不大,均为60μm左右。随硫酸质量浓度的增加,陶瓷膜层表面粗糙度R_(a)先减小后增大,当硫酸质量浓度为200 g/L时,表面粗糙度为0.252μm,磨损体积为0.103 mm^(3),只有硫酸质量浓度为100 g/L时所制备陶瓷膜层磨损体积的1/5左右。物相分析得到2024铝合金表面陶瓷膜层主要是γ-Al_(2)O_(3)相。用200 g/L硫酸制备的Al_(2)O_(3)陶瓷膜的自腐蚀电位和极化电阻均达到最大,分别为-0.604 V和48152.9Ω。综合分析陶瓷膜的耐磨性能和耐腐蚀性能,在2024铝合金表面制备Al_(2)O_(3)陶瓷膜层,硫酸的最佳质量浓度为200 g/L。The 2024 aluminum alloy with high strength and toughness was subjected to surface ceramic treatment in sulfuric acid solution of 100,200 and 300 g/L for 60 min,respectively,and a ceramic film was generated on the surface of 2024 aluminum alloy.The microstructure,thickness,microhardness and electrochemical properties of ceramic film were studied.The results showed that with the increase of sulfuric acid mass concentration,the microhardness of ceramic film increased first and then decreased.When sulfuric acid mass concentration was 200 g/L,the microhardness of ceramic film reached the maximum,which was 273.7 HV.The thickness of ceramic film was about 60μm,which was little affected by the concentration of sulfuric acid.With the increase of sulfuric acid mass concentration,the surface roughness Ra decreased first and then increased.When the mass concentration of sulfuric acid was 200 g/L,the surface roughness was 0.252μm and the wear volume was 0.103 mm^(3),which was only about 1/5 of the wear volume of the ceramic film prepared when the mass concentration of sulfuric acid was 100 g/L.Phase analysis showed that the ceramic coating of 2024 aluminum alloy was mainlyγ-Al_(2)O_(3)phase.The self-corrosion potential and polarization resistance of Al_(2)O_(3)ceramic film prepared with 200 g/L sulfuric acid reached the maximum,which were-0.604 V and 48152.9Ω,respectively.By analyzing the wear resistance and corrosion resistance of ceramic film,Al_(2)O_(3)ceramic film was prepared on the surface of 2024 aluminum alloy.The optimal mass concentration of sulfuric acid was 200 g/L.

关 键 词：2024铝合金 硫酸浓度 Al_(2)O_(3)陶瓷膜 耐腐蚀性能 

分 类 号：TG178[金属学及工艺—金属表面处理]