制备温度对AM60B镁合金表面Ce-Sn转化膜性能的影响
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摘要
为了在AM60B镁合金表面生成复合转化膜,选用Ce-Sn二元体系,通过适当的工艺流程成功制备了均匀完整的转化膜,利用扫描电镜(SEM)观察了样品表面形貌,利用能谱仪(EDS)和X射线衍射仪(XRD)研究了膜成分与物相,并利用电化学工作站和点滴试验研究了试样的耐腐蚀性能。结果表明:所选条件的Ce-Sn转化膜耐腐性能均比相同条件下制备的单一Ce膜有所提高,80℃,20 min转化条件在所选参数中效果最好,所得转化膜的腐蚀电流密度为3.05×10-6A/cm2,腐蚀电压为-1.386 V,膜层电阻1 861Ω·cm2,点滴变色时间较单一Ce转化膜延长了1倍多,涂装性能改善。
In order to generate a composite conversion coating on the surface of AM60 B magnesium alloy,the Ce-Sn two elements system was selected to prepare successfully the uniform and complete film through appropriate process. Subsequently,the sample surface morphology was observed by scanning electron microscope( SEM),and the component and phase composition of the film were detected by energy disperse spectroscopy( EDS) and X-ray diffractometer( XRD),as well as the corrosion resistance of the sample was studied by electrochemical workstation and dropping corrosion test. Results showed that corrosion resistance of Ce-Sn film prepared under the selected conditions increased in the comparison of that of single Ce film. The condition( 80 ℃ and 20 min) was the optimal among the selected conditions. The as-prepared films had the corrosion current of 3. 05 × 10-6 A/cm2,corrosion voltage of-1.386 V and film resistance of 1 861 Ω·cm2. Besides,discoloration time of Ce-Sn conversion film was about twice of that of Ce films,and the adhesive ability was improved after conversion.
In order to generate a composite conversion coating on the surface of AM60 B magnesium alloy,the Ce-Sn two elements system was selected to prepare successfully the uniform and complete film through appropriate process. Subsequently,the sample surface morphology was observed by scanning electron microscope( SEM),and the component and phase composition of the film were detected by energy disperse spectroscopy( EDS) and X-ray diffractometer( XRD),as well as the corrosion resistance of the sample was studied by electrochemical workstation and dropping corrosion test. Results showed that corrosion resistance of Ce-Sn film prepared under the selected conditions increased in the comparison of that of single Ce film. The condition( 80 ℃ and 20 min) was the optimal among the selected conditions. The as-prepared films had the corrosion current of 3. 05 × 10-6 A/cm2,corrosion voltage of-1.386 V and film resistance of 1 861 Ω·cm2. Besides,discoloration time of Ce-Sn conversion film was about twice of that of Ce films,and the adhesive ability was improved after conversion.
引文
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[3]赵怿,董刚,赵博.镁合金在航空领域应用的研究进展[J].有色金属工程,2015,5(2):23-27.
[4]罗智.镁合金材料NVH特性及其汽车应用研究[D].杭州:浙江大学,2014:3-5.
[5]刘波,黎予生,李晓青,等.长安汽车镁合金技术研究与应用进展[J].汽车工艺与材料,2012(1):17-21.
[6]孙家乐.面向轨道交通运输装备的镁合金与铝合金性能及应用对比研究[D].大连:大连交通大学,2012:2-6.
[7]彭友霖,周丽丽,周艳红.镁合金作为生物医用植入材料的临床应用[J].中国组织工程研究与临床康复,2011,15(42):7 923-7 926.
[8]官星旻.可降解生物医用镁合金JDBM作为颌骨修复材料的应用研究[D].上海:上海交通大学,2015:1-11.
[9]杨程,杜红星,刘晓平.镁合金在3C产品中应用现状及前景展望[J].铸造设备研究,2005(6):46-49.
[10]曾英,罗静.镁合金触变成形在3C产品壳体上的应用[J].重庆工学院学报,2006(11):44-46.
[11]曾小勤,王渠东,吕宜振,等.镁合金应用新进展[J].铸造,1998(11):41-45.
[12]韩夏云,龙晋明,薛方勤,等.镁及镁合金应用与表面处理现状及发展[J].轻金属,2003(2):48-51.
[13]张运法.我国镁合金应用领域开发前景分析[J].中国新技术新产品,2010(9):106-107.
[14]徐洛民,王昕,雷黎,等. AZ31镁铝合金铈盐转化膜的致密化处理[J].中国有色金属学报,2013,23(11):3 135-3 140.
[15]钟丽应,曹发和,施彦彦,等. AZ91镁合金表面铈基稀土转化膜的制备及腐蚀电化学行为[J].金属学报,2008(8):979-985.
[16]滕玉洁.镁合金稀土转化膜后处理对腐蚀性能的影响:中国航空学会.探索创新交流———中国航空学会青年科技论坛文集[C].沈阳:中国航空会,2004:5.
[17]曹娜娜,任晓莉,付文超,等.镁锂合金表面锰/锡复合转化膜的制备及性能[J].电镀与涂饰,2015,34(15):846-850.
[18]贺旭东,郭瑞光.镁合金V-Ce转化膜的制备及性能[J].材料保护,2013,46(11):44-46.