块体纳米晶Fe-50Cu合金在H<sub>2</sub>SO<sub>4</sub>溶液中的电化学腐蚀行为

doi:10.11896/cldb.19090142

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Abstract The electrochemical corrosion properties and effect of microstructures on them of a coarse grained and two nanocrystalline Fe-50Cu bulk alloys prepared by powders metallurgy (PM) as well as the liquid phase reduction (LPR) and mechanical alloying (MA) methods with hot pressing, respectively, were investigated in H₂SO₄ solutions by means of electrochemical methods through measuring open circuit potentials, potentiodynamic polarization, electrochemical impedance spectroscopies, and so on. The results show that the corrosion current densities of three Fe-50Cu alloys prepared by the different methods increase with the increment of H₂SO₄ solution concentrations. Their electrochemical impedance spectroscopies are composed of a single capacitive arc, indicating the corrosion processes are controlled by the electrochemical reactions. The changed trend of charge transfer resistances of three Fe-50Cu alloys is adverse to that of corrosion current densities. In the same H₂SO₄ solution concentrations, the corrosion current densities increase and therefore corrosion properties decrease when the grain sizes are decreased. The corrosion current densities of LPR Fe-50Cu alloy are larger, the activation energies and charge trnasfer resistances are lower and therefore its corrosion rates are faster than those of nanocrystalline MA Fe-50Cu alloy.

Key words： electrochemical corrosion nanocrystalline Fe-Cu alloy microstructure mechanical alloying liquid phase reduction

Published: 06 November 2020

CLC number:

TG113.23

Fund:National Natural Science Foundation of China (51271127,51501118), Liaoning Provincial Key Research and Development Program (2018304025), the Scientific Research Program of Education Department of Liaoning Province (LJC201911).

About author:: Tianlu Cuireceived her M.S. degree in June,2018 from Shenyang Normal University,and is currently studying for her Ph.D. degree in materials science and engineering from Northeastern University. Her research interests are mainly preparation processes of nanocrystalline materials as well as their corrosion and protective technology.
Zhongqiu Caoreceived his Ph.D. degree in materials Science and Engineering from Institute of Metals Research, Chinese Academy of Science in 2001. He is a professor and master supervisor in Shenyang Normal University, and currently focusing on some researches on the preparation technology of special materials as well as corrosion and protection. He has published more than 100 journal papers, obtained 6 items of national invention patents authorized.

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	CUI Tianlu
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	XU Huan
	ZHANG Ke
	WANG Yan

Cite this article:

CUI Tianlu,CAO Zhongqiu,JIA Zhongqiu, et al. Electrochemical Corrosion Behavior of Nanocrystalline Fe-50Cu Bulk Alloys in H₂SO₄ Solutions[J]. Materials Reports, 2020, 34(20): 20096-20102.

URL:

http://www.mater-rep.com/EN/10.11896/cldb.19090142 OR http://www.mater-rep.com/EN/Y2020/V34/I20/20096

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