2A14铝合金局部硬质阳极氧化工艺
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摘要
针对2A14铝合金局部硬质阳极氧化工艺进行了深入研究,提出以双重封闭后的铬酸阳极氧化膜代替传统的涂漆保护,作为2A14铝合金局部硬质阳极氧化的遮蔽层。利用极化曲线、阻抗谱(EIS)和点滴试验等测试方法,研究了双重封闭后铬酸阳极氧化膜的腐蚀行为,并与重铬酸钾封闭、水封闭后氧化膜进行比较。与重铬酸钾封闭、水封闭相比,双重封闭后铬酸阳极氧化膜的腐蚀电流密度下降2个数量级,氧化膜多孔层电阻R_p值提高500倍以上,氧化膜点滴试验时间提高2倍～5倍。结果表明,双重封闭技术能有效提高铬酸阳极氧化膜的封孔质量,增强了耐腐蚀、耐电压性能,可作为2A14铝合金局部硬质阳极氧化遮蔽层。采用该工艺制备的局部硬质阳极氧化膜均匀致密,厚度可达60μm,平均硬度可达360,满足设计要求(厚度≥40μm,硬度≥329)。
The local hard anodizing process of 2 A14 aluminum alloy has been studied and it was proposed that the double-sealed chromic acid anodizing film can be used as the shielding layer for the local hard anodizing of 2 A14 aluminum alloy instead of the traditional painted protection.The corrosion behavior of the double-sealed chromic acid anodizing film was studied by means of polarization curve, electrochemical impedance spectroscopy(EIS) and dropping test, which was also compared with the oxidation film sealed by potassium dichromate and water.According to the comparison results, after double sealing, the corrosion current density of the chromic acid anodizing film decreases by two orders of magnitude, the resistance R_p value of porous oxide film is increased by more than 500 times, and the dropping test time is increased by 2 to 5 times.The results show that the double-sealed technology effectively improved the sealing quality of the chromic acid anodizing film so that it can be used as the local hard anodizing shielding layer of 2 A14 aluminum alloy with good corrosion resistance and voltage resistance.The local hard anodizing film prepared by this process is uniform and dense, with the thickness up to 60 μm and the average hardness up to 360, which meets the design requirements(thickness≥40 μm and hardness≥329).
The local hard anodizing process of 2 A14 aluminum alloy has been studied and it was proposed that the double-sealed chromic acid anodizing film can be used as the shielding layer for the local hard anodizing of 2 A14 aluminum alloy instead of the traditional painted protection.The corrosion behavior of the double-sealed chromic acid anodizing film was studied by means of polarization curve, electrochemical impedance spectroscopy(EIS) and dropping test, which was also compared with the oxidation film sealed by potassium dichromate and water.According to the comparison results, after double sealing, the corrosion current density of the chromic acid anodizing film decreases by two orders of magnitude, the resistance R_p value of porous oxide film is increased by more than 500 times, and the dropping test time is increased by 2 to 5 times.The results show that the double-sealed technology effectively improved the sealing quality of the chromic acid anodizing film so that it can be used as the local hard anodizing shielding layer of 2 A14 aluminum alloy with good corrosion resistance and voltage resistance.The local hard anodizing film prepared by this process is uniform and dense, with the thickness up to 60 μm and the average hardness up to 360, which meets the design requirements(thickness≥40 μm and hardness≥329).
引文
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[2] 朱祖芳.铝合金阳极氧化与表面处理技术[M].北京:化学工业出版社,2004.
[3] 陈梁,廖重重,刘晨岑,等.5052铝合金硬质阳极氧化工艺研究[J].浙江化工,2016,47(3):38-41.
[4] 王曼.2A12铝合金硬质阳极氧化工艺及复合自润滑膜的研究[D].镇江:江苏大学,2016.
[5] 唐华.2A14铝合金硬质阳极氧化工艺及性能研究[D].南昌:南昌航空大学,2011.
[6] 石绪忠,刘晓鹤,余向飞,等.6061铝合金硬质阳极氧化的影响因素研究[J].材料开发与应用,2018,33(4):53-58.
[7] 闻勃.表面氧化处理对2024铝合金疲劳性能的影响[D].上海:上海交通大学,2012.
[8] 曾鑫龙,王春霞,蔡肖涵,等.温度对2A12铝合金硬质阳极氧化膜性能的影响[J].电镀与精饰,2018,40(9):6-9.
[9] 张丽,付国燕,陆江银,等.3003铝合金低温硫酸硬质阳极氧化[J].电镀与涂饰,2018,37(3):113-120.
[10] 曹歆昕,李吉丹,张晶,等.2A12铝合金硬质阳极氧化工艺研究[J].电镀与精饰,2017,39(9):38-41.
[11] 廖广其,尹茂生,朱晓英,等.局部硬质阳极氧化用铬酸阳极氧化膜层作保护层的工艺研究[J].腐蚀与防护,2006,27(9):476-477.
[12] 舒伟发,张海金.铝合金局部厚膜硬质阳极化工艺[J].电镀与涂饰,2014,33(21):925-928.
[13] 张宝宏,丛文博,杨萍.金属电化学腐蚀与防护[M].北京:化学工业出版社,2005.
[14] 张允诚,胡如南,向荣.电镀手册[M].北京:国防工业出版社,2007.
[15] 刘伟.锻造LF6法兰阳极化后表面深灰色原因分析[J].火箭推进,2008,34(1):39-44.Liu Wei.Analysis of abnormal surface colour of forged LF6 flange after anodizing[J].Journal of Rocket Propulsion,2008,34(1):39-44.
[16] 周赟.铝合金阳极氧化膜封闭工艺及膜性能的研究[D].合肥:合肥工业大学,2012.
[17] 张承平.3003铝合金硬质阳极氧化膜封闭工艺及其性能研究[D].长沙:湖南大学,2016.
[18] 薛露平,许维超,叶晖.ZL104局部阳极氧化工艺研究[J].火箭推进,2016,42(5):92-97.XUE Luping,XU Weichao,YE Hui.Research on local anodization process for ZL104 [J].Journal of Rocket Propulsion,2016,42(5):92-97.
[19] 张养宁,杨战争.铝合金硫酸阳极氧化膜棕红色印迹成因分析[J].火箭推进,2009,35(4):49-52.ZHANG Yangning,YANG Zhanzheng.Formation analysis of brown red spots on the surface of sulfuric acid anodic oxide film on aluminium alloy [J].Journal of Rocket Propulsion,2009,35(4):49-52.
[20] 田连朋,左禹,赵景茂,等.铝合金阳极氧化膜醋酸镍封闭方法耐蚀性研究[J].腐蚀与防护,2006,27(2):58-62.