Effect of Gd Addition on Corrosion Behavior of AM60 Magnesium Alloy

doi:10.11902/1005.4537.2018.052

Journal of Chinese Society for Corrosion and protection

2019, Vol. 39

Issue (2): 185-191 DOI: 10.11902/1005.4537.2018.052

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Effect of Gd Addition on Corrosion Behavior of AM60 Magnesium Alloy

Li LIU,Sirong YU(

)

College of Mechanical and Electronic Engineering, China University of Petroleum (East China), Qingdao 266580, China

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Abstract

AM60 and AM60Gd1.0 magnesium alloys were prepared by zone solidification purifying method. Microstructures and phase compositions of the alloys were analyzed. The corrosion resistance of the alloys in 0.9% (mass fraction) NaCl solution and simulated body fluid were examined by hydrogen evolution test and electrochemical test. Results show that AM60 alloy composed of α-Mg and β-Mg₁₇Al₁₂, while Al₂Gd was found for AM60Gd1.0. The corrosion rate of AM60Gd1.0 alloy was lower than that of AM60 alloy. The E_corr of AM60Gd1.0 alloy was much positive than that of AM60 alloy due to the addition of 1.0%Gd. The I_corr of AM60Gd1.0 alloy was smaller than that of AM60 alloy. In NaCl solution, the EIS curves of AM60 and AM60Gd1.0 alloy all composed of a capacitive loop and an inductive loop. In SBF, the EIS curves of the alloys composed of two capacitive loops. Being soaked in NaCl solution for the same period of time, the radius of the EIS curve of AM60Gd1.0 alloy was larger than that of AM60 alloy.

Key words: AM60 magnesium alloy Gd corrosion rate polarization electrochemical impedance

Received: 20 April 2018

ZTFLH:

TG178

Fund: Supported by Fundamental Research Funds for the Central Universities(16CX06020A)

Corresponding Authors: Sirong YU E-mail: SirongYu2014@126.com

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Cite this article:

Li LIU,Sirong YU. Effect of Gd Addition on Corrosion Behavior of AM60 Magnesium Alloy. Journal of Chinese Society for Corrosion and protection, 2019, 39(2): 185-191.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2018.052 OR https://www.jcscp.org/EN/Y2019/V39/I2/185

Table 1 Compositions of AM60 and AM60Gd1.0 alloys

Fig.1 Microstructures of AM60 (a) and AM60Gd1.0 (b) alloys

Fig.2 XRD patterns of AM60 and AM60Gd1.0 alloys

Fig.3 XRD patterns of corrosion products formed on AM60 and AM60Gd1.0 alloys after immersion in simulated body fluid for 7 d

Fig.4 Macro-appearances of AM60 and AM60Gd1.0 alloys after immersion in 0.9%NaCl solution for 7 d

Fig.5 Micro-appearances of AM60 (a) and AM60Gd1.0 (b) alloys after immersion in 0.9%NaCl solution for 7 d

Fig.6 Macro-appearances of AM60 and AM60Gd1.0 alloysafter immersion in simulated body fluid for 7 d

Fig.7 Micro-appearances of AM60 (a) and AM60 Gd1.0 (b) alloys after immersed in simulated body fluid for 7 d

Table 2 Corrosion potentials, corrosion current densities and pitting corrosion potentials of AM60 and AM60Gd1.0 alloys in different solutions

Fig.8 Polarization curves of AM60 and AM60Gd1.0 alloys in 0.9%NaCl solution (a) and simulated body fluid (b)

Fig.9 EIS curves of AM60 (a) and AM60Gd1.0 (b) alloys in 0.9%NaCl solution

Fig.10 EIS curves of AM60 (a) and AM60Gd1.0 (b) alloys in simulated body fluid

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