压铸AZ91D镁合金表面热喷涂铝扩散冶金层组织和性能
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摘要
采用电弧喷涂技术对压铸AZ91D镁合金表面喷涂纯铝。为了提高其界面性能,对喷涂后样品在300℃、350℃、400℃和437℃分别进行1 h、5 h和10 h扩散热处理,并通过扫描电镜(SEM)、能谱仪(EDS)、X射线衍射(XRD)、及电化学分析仪测试了其界面的微观结构和性能。结果表明:在<400℃的温度下进行热处理时,其界面形成β-Mg_(17)Al_(12)相扩散层,并伴有少量γ-Mg_2A_(13)相,且扩散层厚度随保温时间的延长而增大。在温度≥400℃,保温时间较短时(1 h和5 h),界面生成γ一Mg_2A_(13)相和β-Mg_(17)Al_(12)相两个扩散层,当保温时间延长至10 h时,扩散层演变成了β-Mg_(17)Al_(12)单相层和α-Mg+β-Mg_(17)Al_(12)复合相层。相对AZ91D基体而言,各种冶金扩散层的耐腐蚀性能都有明显增强,特别是两个单相扩散层。
Abstrct:Al coating was prepared on the surface of die-casting AZ91 D Mg alloy through electro-arc spraying technology.In order to enhance the performances of the interface,the samples were heat treated at 300 ℃,350 ℃,400 ℃ and 437 ℃ for lh,5 h and 10 h after spraying,respectively.The microstructures and properties were charactered by the means of XRD,scanning electron microscope(SEM),energy-dispersive spectrometry(EDS),and electrochemical analyzer.The results show that β-Mg_(17)Al_(12) phase diffusion layer appears at interface when the annealing temperature under 400 ℃,and a little γ-Mg_2A_B phase accompanied,and the more annealing time,the thicker diffusion layer.When the annealing temperature is over 400 ℃,γ phase layer and β-Mg_(17)Al_(12) phase layer appears for short annealing time(1 h,5 h),the microstructure of diffusion layer becomes β phase and α+β dual-phase layer for10 h.Comparing the Mg alloy substrate,the corrosion resistance of the diffusion layer is obviously increased,further,the single-phase(β) diffusion layer is better than dual-phase(α+β) diffusion layer.
Abstrct:Al coating was prepared on the surface of die-casting AZ91 D Mg alloy through electro-arc spraying technology.In order to enhance the performances of the interface,the samples were heat treated at 300 ℃,350 ℃,400 ℃ and 437 ℃ for lh,5 h and 10 h after spraying,respectively.The microstructures and properties were charactered by the means of XRD,scanning electron microscope(SEM),energy-dispersive spectrometry(EDS),and electrochemical analyzer.The results show that β-Mg_(17)Al_(12) phase diffusion layer appears at interface when the annealing temperature under 400 ℃,and a little γ-Mg_2A_B phase accompanied,and the more annealing time,the thicker diffusion layer.When the annealing temperature is over 400 ℃,γ phase layer and β-Mg_(17)Al_(12) phase layer appears for short annealing time(1 h,5 h),the microstructure of diffusion layer becomes β phase and α+β dual-phase layer for10 h.Comparing the Mg alloy substrate,the corrosion resistance of the diffusion layer is obviously increased,further,the single-phase(β) diffusion layer is better than dual-phase(α+β) diffusion layer.
引文
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[17]Spencer K,Zhang M-X,Heat treatment of cold spray coatings to form protective intermetallic layer[J].Scripta Materialia,2009,61:44-47.
[18]Chang M H,Chang J K,Tsai P J,Tsai W T,Deng M J,Sun I W.Surf Coat Technol,2010,205:200-204.
[19]SUN H Q,SHI Y N,ZHANG M X,K.LU,Surface alloying of Mg alloy subjected to surface mechanical attrition treatment[J].Surface&Coatings Technology,2008,202:3947-3953.
[20]张津,孙智富.AZ91D镁合金表面热喷涂铝涂层研究[J].中国机械工程,2002,23:83-84.
[21]Arrabal R,Pardo A,Merino M C,etc.Al/SiC thermal spray coatings for corrosion protection of Mg-Al alloys in humid and saline environments[J].Surface&Coatings Technology,2010,204:2767-2774.
[22]Spencer K,Zhang M X.Heat treatment of cold spray coatings to form protective intermetallic layers L J J.Scripta Materials,2009,61(1):44-47.
[23]J Mahendran G,Babu S,Balasubramanian V.Analyzing the Effect of Diffusion Bonding Process Parameters on Bond Characteristics of Mg-Al Dissimilar Joints[J].Journal of Materials Engineering and Performance,2010,19(5):657-665.
[24]王业双,张咏波,王渠东,等.Mg-9Al合金铸造凝固模型[J],金属学报,2002(5):539-543.
[25]Liu F C,Liang W,Li X R,etc.Improvement of corrosion resistance of pure magnesium via vacuum pack treatment[J].Journal of Alloys and Compounds,2008,461(1/2):399-403.
[2]Liu Bao-sheng,Wei Ying-hui,Hou Li-feng.Formation Mechanism of Discoloration on Die-Cast AZ91D Components Surface After Chemical Conversion L J J-Journal of materials engineering and performance,2013,22(1):50-56.
[3]Liu Bao—sheng,Wei Ying-hui,Chen Wei—yi,etc.Microporosity formation in Mg alloys and its effect on protective coatings[J].Surface Engineering,2014,30(12):939-943.
[4]梁春林,刘宜汉,韩变华,等.镁合金表面处理研究现状及发展趋势[J].表面技术.2006,35(6):57-60.
[5]Chong K Z,Shih T S.Conversion coating treatment for magnesium alloys by a permanganate phosphate solution[J].Material Chemistry and Physics,2003,80:191-200.
[6]Hawke D,Albright D L,A phosphate permanganate conversion coating for magnesium[J].Metal Finishing,1995(10):34-38.
[7]张荣发,单大勇,韩恩厚,等.镁合金阳极氧化的研究进展与展望[J].中国有色金属学报,2005,16(70):1137-1148.
[8]Zozoulin A J,B artak D E,Anodized coating for magnesium alloys[J].Metal Finishing,1994,92(3):39-44.
[9]KuirenLiu,Q uan Liu,Qing Han,Ganfeng Tu.Electrodeposition of Al on AZ31 magnesium alloy in TMPAC-A1C13 ionic liquids[J].Trans.Nonferrous Met.Soc.China 2011(21)2104-2110.
[10]刘海萍,夏文超,毕四富,等.镁合金直接化学镀镍工艺及镀层性能[J].电镀与涂饰,2011(02):22-23.
[11]刘应辉,康志新,方刚,等.AM60镁合金表面功能纳米有机薄膜的制备及特性研究[J].功能材料,2010(11):113-116.
[12]K.Spencer,D.M.Fabijanic,M.-X.Zhang,The use of A1-A1203cold spray coatings to improve the surface properties of magnesium alloys[J].Surface&Coatings Technology.2009,204:336-344.
[13]王洪涛,贾鹏,林晓娉,等.镁合金表面电弧喷涂金属耐蚀涂层性能研究[J]腐蚀科学与防护技术,2009(3):102-105.
[14]Youping M,Weixin W,Pengfei L,Kewei X.Effects of treatment parameters on microstructure of diffusion alloyed coatings on pure magnesium[J].Surf.Eng.2004(20):108-112.
[15]Ma YP,Xu KW,et al.The effect of solid diffusion surface alloying on properties of ZM5 magnesium alloy[J].Surf.Coat.Tech,2005(21):65-170.
[16]Hirmke J,Zhang M X,StJohn D H.Surface alloying of AZ91E alloy by Al—Zn packed powder[J].Surf.Coat.Technol.2011,206:425-433.
[17]Spencer K,Zhang M-X,Heat treatment of cold spray coatings to form protective intermetallic layer[J].Scripta Materialia,2009,61:44-47.
[18]Chang M H,Chang J K,Tsai P J,Tsai W T,Deng M J,Sun I W.Surf Coat Technol,2010,205:200-204.
[19]SUN H Q,SHI Y N,ZHANG M X,K.LU,Surface alloying of Mg alloy subjected to surface mechanical attrition treatment[J].Surface&Coatings Technology,2008,202:3947-3953.
[20]张津,孙智富.AZ91D镁合金表面热喷涂铝涂层研究[J].中国机械工程,2002,23:83-84.
[21]Arrabal R,Pardo A,Merino M C,etc.Al/SiC thermal spray coatings for corrosion protection of Mg-Al alloys in humid and saline environments[J].Surface&Coatings Technology,2010,204:2767-2774.
[22]Spencer K,Zhang M X.Heat treatment of cold spray coatings to form protective intermetallic layers L J J.Scripta Materials,2009,61(1):44-47.
[23]J Mahendran G,Babu S,Balasubramanian V.Analyzing the Effect of Diffusion Bonding Process Parameters on Bond Characteristics of Mg-Al Dissimilar Joints[J].Journal of Materials Engineering and Performance,2010,19(5):657-665.
[24]王业双,张咏波,王渠东,等.Mg-9Al合金铸造凝固模型[J],金属学报,2002(5):539-543.
[25]Liu F C,Liang W,Li X R,etc.Improvement of corrosion resistance of pure magnesium via vacuum pack treatment[J].Journal of Alloys and Compounds,2008,461(1/2):399-403.