2A96铝合金表面含三价铬转化膜制备及其电化学性能研究
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摘要
通过调整Cr_2(SO_4)_3浓度和K_2ZrF_6浓度,在2A96铝合金表面制备了含三价铬转化膜;采用极化曲线和交流阻抗谱研究了所制备含三价铬转化膜的电化学性能,利用金相显微镜和扫描电镜(SEM)对铝合金成膜前后的表面形貌进行观察和分析。结果表明,在单因素试验中,质量浓度分别为5 g/L Cr_2(SO_4)_3和2.0 g/L K_2ZrF_6溶液中制备含三价铬转化膜的自腐蚀电位最大,交流阻抗谱的相位角最大,阻抗弧长也最大,耐腐蚀性能最好;显微形貌分析得出成膜后的2A96铝合金表面覆盖了一层转化膜。
The conversion coating containing trivalent chromium was prepared on the surface of 2A96 Al alloy by adjusting the solution of different concentration of Cr_2(SO-4)_3 and K_2ZrF_6. The electrochemical corrosion properties of the conversion coating containing chromium trivalent were studied by polarization curves and AC impedance spectroscopy. The surface morphology of aluminum alloy before and after coating formation was observed by metallographic microscope and scanning electron microscope(SEM). The results showed that in the single-factor test, the self-corrosion potential of the conversion coating containing trivalent chromium was the highest when the mass concentration was 5 g/L Cr_2(SO_4)_3 and 2.0 g/L K_2ZrF_6 solution, the maximum phase angle of the AC impedance spectrum was the highest, while the impedance arc length was the largest, and the corrosion resistance of the conversion coating containing trivalent chromium was the best. The results of the microstructure analysis indicated that the surface of 2A96 aluminum alloy was covered with a conversion coating after the conversion test.
The conversion coating containing trivalent chromium was prepared on the surface of 2A96 Al alloy by adjusting the solution of different concentration of Cr_2(SO-4)_3 and K_2ZrF_6. The electrochemical corrosion properties of the conversion coating containing chromium trivalent were studied by polarization curves and AC impedance spectroscopy. The surface morphology of aluminum alloy before and after coating formation was observed by metallographic microscope and scanning electron microscope(SEM). The results showed that in the single-factor test, the self-corrosion potential of the conversion coating containing trivalent chromium was the highest when the mass concentration was 5 g/L Cr_2(SO_4)_3 and 2.0 g/L K_2ZrF_6 solution, the maximum phase angle of the AC impedance spectrum was the highest, while the impedance arc length was the largest, and the corrosion resistance of the conversion coating containing trivalent chromium was the best. The results of the microstructure analysis indicated that the surface of 2A96 aluminum alloy was covered with a conversion coating after the conversion test.
引文
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[2]FAN C H,CHEN X H,ZHOU X P,et al.Microstructure Evolution and Strengthening Mechanisms of SprayFormed 5A12 Al Alloy Processed by High Reduction Rolling[J].Transactions of Nonferrous Metals Society of China,2017,27(11):2363-2370.
[3]FAN C H,PENG Y B,YANG H T,et al.Hot Deformation Behavior of Al-9.0Mg-0.5Mn-0.1Ti Alloy Based on Processing Maps[J].Transactions of Nonferrous Metals Society of China,2017,27(2):289-297.
[4]范才河,严红革,彭英彪,等.大应变热轧喷射成形高镁铝合金的微观结构及力学性能[J].中国有色金属学报,2017,27(1):64-71.FAN Caihe,YAN Hongge,PENG Yingbiao,et al.Microstructures and Mechanical Properties of SprayForming High Magnesium Aluminum Alloy During Large Strain Hot Rolling[J].The Chinese Journal of Nonferrous Metals,2017,27(1):64-71.
[5]GUO Y,FRANKEL G S.Characterization of Trivalent Chromium Process Coating on AA2024-T3[J].Surface and Coatings Technology,2012,206(19/20):3895-3902.
[6]CHEN W K,BAI C Y,LIU C M,et al.The Effect of Chromic Sulfate Concentration and Immersion Time on the Structures and Anticorrosive Performance of the Cr(Ⅲ)Conversion Coatings on Aluminum Alloys[J].Applied Surface Science,2010,256(16):4924-4929.
[7]范才河,曾广胜,陈喜红,等.大应变交叉轧制Al-9Mg-1.8Li合金板材的显微组织及织构特征[J].中国有色金属学报,2018,28(8):1551-1558.FAN Caihe,ZENG Guangsheng,CHEN Xihong,et al.Cross Rolling of Large Strain on Microstructure and Texture Characteristic of Al-9Mg-1.8Li Alloy Sheet[J].The Chinese Journal of Nonferrous Metals,2018,28(8):1551-1558.
[8]范才河,沈彤,范语楠,等.轧制方式对工业包装铝合金板材微结构及各向异性的影响[J].包装学报,2018,10(3):52-58.FAN Caihe,SHEN Tong,FAN Yunan,et al.Effects of Rolling Methods on Microstructure and Anisotropy of Aluminium Alloy Sheet for Industrial Packing[J].Packaging Journal,2018,10(3):52-58.
[9]余会成.6063铝合金三价铬化学转化膜的制备及性能研究[D].长沙:中南大学,2009.YU Huicheng.Preparation and Properties of 6063Aluminum Trivalent Chromium Chemical Conversion Coatings[D].Changsha:Central South University,2009.
[10]李国栋.环保型铝合金三价铬转化膜制备及腐蚀性能研究[D].银川:宁夏大学,2014.LI Guodong.Preparation of Environmentally Friendly Aluminum Trivalent Chromium Conversion Coating and Corrosion Resistance[D].Yinchuan:Ningxia University,2014.
[11]孙凤仙,颜广炅,姚伟.合金非六价铬化学转化处理工艺的研究进展[J].电镀与涂饰,2014,33(3):124-127.SUN Fengxian,YAN Guangjiong,YAO Wei.Research Progress of Non-Hexavalent Chromium Chemical Conversion Treatment of Aluminum Alloy[J].Electroplating and Finishing,2014,33(3):124-127.
[12]彭继华,李文芳.铝合金表面稀土化学转化处理方法:CN200810027556.4[P].2008-09-10.PENG Jihua,LI Wenfang.Rare Earth Chemical Conversion Treatment Method on Aluminum Alloy Surface:CN200810027556.4[P].2008-09-10.
[13]崔秀芳.AZ91D镁合金植酸转化膜研究[D].哈尔滨:哈尔滨工程大学,2009.CUI Xiufang.Study on Phytic Acid Conversion Coating on AZ91D Magnesium Alloy[D].Harbin:Harbin Engineering University,2009.
[14]张军军.铝合金表面Ce-Mn转化膜常温制备及表征[D].广州:华南理工大学,2010.ZHANG Junjun,Preparation and Characterization of Ce-Mn Conversion Film on Aluminum Surface at Room Temperature[D].Guangzhou:South China University of Technology,2010.
[15]王昊,安成强,郝建军,等.铝及铝合金无铬钝化的研究进展[J].电镀与环保,2014,34(1):1-3.WANG Hao,AN Chengqiang,HAO Jianjun,et al.Advances in Research on Non-Chromate Passivation of Aluminum and Aluminum Alloys[J].Electroplating and Pollution Control,2014,34(1):1-3.
[16]谭星.2024-T3铝合金三价铬转化膜的制备及自修复行为的研究[D].长沙:中南大学,2013:18-25.TAN Xing.A Trivalent Chromium Conversion Coating on AA2024-T3 and Its Self-Healing Behavior[D].Changsha:Central South University,2013:18-25.
[17]刘超,彭进平,陈世荣,等.新型铝合金三价铬复合转化膜工艺研究[J].电镀与涂饰,2015,34(21):1226-1231.LIU Chao,PENG Jinping,CHEN Shirong,et al.Study on a Novel Process of Trivalent Chromium-Based Composite Conversion Coating For Aluminum Alloy[J].Electroplating and Finishing,2015,34(21):1226-1231.
[18]BIRBILIS N,BUCHHEIT R G.Investigation and Discussion of Characteristics for Intermetallic Phases Common to Aluminum Alloys as a Function of Solution pH[J].Journal of the Electrochemical Society,2008,115(30):120-124.
[19]彭文才.铝合金在海水中的腐蚀性能研究[D].长沙:湖南大学,2010:26-29.PENG Wencai.Corrosion Behavior of Aluminum Alloy in Seawater[D].Changsha:Hunan University,2010:26-29.