微量Co对7056铝合金组织与腐蚀性能的影响

doi:10.11896/cldb.201902021

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Abstract The effect of trace Co element on the microstructures and corrosion properties of 7056 aluminum alloy was studied by metallographic observation, intergranular corrosion test, electrochemical corrosion test, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results indicated that the 7056 aluminum alloy with trace Co presented a 22.57% increase of stress corrosion life, an improved fracture strength of stress corrosion from 511 MPa to 559 MPa and a dropped stress corrosion factor from 0.118 to 0.064, compared with the alloy without Co. The 7056 aluminum alloy with Co formed more uniform and fine Al₃Zr dispersion phase, which effectively pinned the dislocation and subboundary, made the base keep deformation response structure and small angle grain boundary, thus restrained the recrystallization.and kept fine subcrystalline structure. The precipitation phase in the subgrain boundary is close to that in the intracrystalline, which reduced the electrochemical motivation of intergranular corrosion and improved the resistance to intergranular corrosion. Besides, the area fraction of the precipitated phase at the grain boundary increased, corresponding to the increase of the ratio of anode to cathode in electrochemical reaction process, which resulted in a decrease of the anode current and a decrease of the dissolution rate of the precipitated phase at the grain boundary. The disconti-nuous grain boundary precipitates can block anodic dissolution channels along grain boundaries, slow down the intergranular corrosion and improve the stress corrosion resistance of the alloy.

Key words： Co element corrosion property recrystallization grain boundary precipitates

Published: 31 January 2019

CLC number:

TG146.2+1

Fund:This work was financially supported by National Key Research and Development Program of China (2016YFB0300801), Natural Science Foundation of Hunan Province of China (2018JJ3645), Major Research Equipment Development Projects of National Natural Science Foundation of China (51327902), Graduate Free Exploration and Innovation Project of Central South University of China (2018zzts152).

About author:: Liang Zhou received his M.S. degrees in December 2015 from Guangdong Ocean University in engineering. He is studying Material Science and Engineering at the Light Alloy Research Institute of Central South University of China.Kanghua Chen is a professor and doctoral tutor of Central south University, mainly engaged in the research of aluminum alloy materials.

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	Articles by authors
	ZHOU Liang
	CHEN Songyi
	PENG Zhenling
	ZHANG Xinglin
	FAN Shumin
	CHANG Jiangyu
	YUAN Dingling
	CHEN Kanghua

Cite this article:

ZHOU Liang,CHEN Songyi,PENG Zhenling, et al. Effect of Trace Co on Microstructures and Corrosion Properties of 7056
Aluminum Alloy[J]. Materials Reports, 2019, 33(2): 314-320.

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http://www.mater-rep.com/EN/10.11896/cldb.201902021 OR http://www.mater-rep.com/EN/Y2019/V33/I2/314

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