Effect of Rare Earth La on Microstructure and Corrosion Resistance of AZ91D Magnesium Alloy

GU Dong-dong; HAN Bao-jun; XU Zhou

doi:10.11973/fsyfh-201604009

Corrosion & Protection > 2016 > 37(4): 313-316. > DOI: 10.11973/fsyfh-201604009

GU Dong-dong, HAN Bao-jun, XU Zhou. Effect of Rare Earth La on Microstructure and Corrosion Resistance of AZ91D Magnesium Alloy[J]. Corrosion & Protection, 2016, 37(4): 313-316. DOI: 10.11973/fsyfh-201604009

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Effect of Rare Earth La on Microstructure and Corrosion Resistance of AZ91D Magnesium Alloy

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Received Date: April 17, 2015

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The microstructure and corrosion resisitance of AZ91D alloy with different additions of lanthanum were investigated by OM, SEM, EDS, XRD and electrochemical polarization testing. Results show that the addition of La refined the microstructure of AZ91D Mg alloy, and decreased the volume fraction of β-Mg17Al12 phase, made their distribution change from continuously netlike to discontinuously disperse. At the same time, a new phase Al11La3 formed. Certain amount of La decreased the corrosion rate and the corrosion current density obviously. Also, they had more positive corrosion potential and improved the corrosion property. Especially when the addition of La was 1.0 mass%, the corrosion rate decreased to 0.157 mg·cm-2·h-1 about 58% of the AZ91D alloy. And it had more positive corrosion potential, -1 429 mV (SCE), which was 95.4 mV higher than that of AZ91D alloy. Besides the corrosion current density (8.8×10-4 A·cm-2) decreased significantly compared with the AZ91D alloy.
- lanthanum,
- AZ91D alloy,
- corrosion weight loss,
- microstructure

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[1]	MORDIKE B L,EBERT T. Magnesium properties-application-potential[J]. Materials Science Engineering:A,2001,302:37-45.
[2]	曹大力,邱竹贤,徐长伟,等. 金属镁制备中存在的问题及对策[J]. 矿冶工程,2006,26(3):53-56.
[3]	李宜达,梁敏洁,廖海洪,等. 高性能镁合金及其在汽车行业应用的研究进展[J]. 热加工工艺,2013,42(10):12-16.
[4]	郑润芬. 纯镁及镁合金大气腐蚀和化学氧化工艺研究[D]. 大连:大连理工大学,2007.
[5]	蒋太富,刘静安. 镁及镁合金材料的应用及市场开拓前景[J]. 铝加工,2007(2):5-10.
[6]	ZHOU J C,LI Q,ZHANG H X,et al. Corrosion behavior of AZ91D magnesium alloy in three different physiological environments[J]. Journal of Materials Engineering and Performance,2014,23(1):181-186.
[7]	LU Z,ZHOU J,SUN Z M,et al. Effect of rare earth elements on the structures and mechanical properties of magnesium alloys[J]. Chinese Science Bulletin,2013,58(7):816-820.
[8]	刘生发,王慧源,徐萍. 钕对AZ91镁合金腐蚀性能的影响[J]. 铸造,2006,55(3):296-299.
[9]	李克杰,李全安,谢建昌,等. 稀土在耐热镁合金中的研究应用[J]. 稀土,2009,30(3):79-83.
[10]	王国军. Nd及T4热处理对AM60镁合金显微组织和力学性能的影响[D]. 太原:太原理工大学,2010.
[11]	韩剑,戴起勋,李桂荣,等. 稀土钇对7055铝合金铸态组织的影响[J]. 材料工程,2009,53(4):67-70.
[12]	徐光晨,陈翌庆,刘丽华,等. La对镁/铝液固扩散连接界面组织及性能的影响[J]. 中国有色金属学报,2014,24(11):2743-2748.
[13]	徐卫军,马颖,吕维玲,等. 镁合金腐蚀的影响因素[J]. 腐蚀与防护,2007,28(4):163-166.
[14]	SONG G,ATRENS A,WU X,et al. Corrosion behavior of AZ21,AZ501 and AZ91 in sodium chloride[J]. Corrosion Science,1998,40(10):1769-1791.

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