Corrosion Behavior of Cu-based Metallic Glass Composites in NaCl Solution

doi:10.11902/1005.4537.2017.184

Journal of Chinese Society for Corrosion and protection

2018, Vol. 38

Issue (5): 478-486 DOI: 10.11902/1005.4537.2017.184

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Corrosion Behavior of Cu-based Metallic Glass Composites in NaCl Solution

Zhiying ZHANG(

), Jianan TANG, Jie YU, Xudong WANG, Luochao HUANG, Junwen ZHOU, Hao TANG, Jikang ZHANG, Yatao CHEN, Dongpeng CHENG

School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China

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Abstract

Using differential scanning calorimetry (DSC) with heating rate of 10 K/min, the glass transition temperature T_g and the crystallization temperature T_x of the Cu-based bulk metallic glasses (BMGs) Cu_47.5Zr_47.5-_xAl₅Hf_x (x=0, 9.5) were determined to be 712~722 K and 747~766 K, respectively. X-ray diffraction (XRD) analysis confirmed that Cu-based metallic glass or metallic glass-nanocrystalline composites could be obtained throu-gh annealing. The microstructure and microhardness were affected by the annealing temperature and time. When the annealing temperature was above T_g, with the increase of annealing temperature and time, the crystallinity and the microhardness gradually increased and then leveled off. Immersion tests and potentiodynamic polarization tests were carried out to investigate the corrosion behavior of the as-cast and annealed samples in 3.5%NaCl solution. Pitting was observed on the Cu_47.5Zr_47.5-_xAl₅Hf_x (x=0, 9.5) samples after immersion in 3.5%NaCl solution. Compared with the as-cast samples, the samples anneal-ed at 623 K (i.e. below T_g) or at 773 K (i.e. slightly above T_x) exhibited higher corrosion potential and slightly larger corrosion current density, indicating the similar corrosion resistance of them. The samples annealed at 923 K (i.e. much higher than T_x) for 30 min exhibited much lower corrosion potential and similar corrosion current density, indicating their poorer corrosion resistance. Hf content showed minor effect on the corrosion resistance.

Key words: bulk metallic glass composite anneal corrosion potentiodynamic polarization XRD microhardness

Received: 09 November 2017

ZTFLH:

TG146.4

Fund: Supported by National Natural Science Foundation of China (51502229), Start-up Research Fund of Wuhan University of Technology (471-40120189) and Independent Innovation Research Fund of Wuhan University of Technology (2017-CL-B1-08)

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	Articles by authors
	Zhiying ZHANG
	Jianan TANG
	Jie YU
	Xudong WANG
	Luochao HUANG
	Junwen ZHOU
	Hao TANG
	Jikang ZHANG
	Yatao CHEN
	Dongpeng CHENG

Cite this article:

Zhiying ZHANG, Jianan TANG, Jie YU, Xudong WANG, Luochao HUANG, Junwen ZHOU, Hao TANG, Jikang ZHANG, Yatao CHEN, Dongpeng CHENG. Corrosion Behavior of Cu-based Metallic Glass Composites in NaCl Solution. Journal of Chinese Society for Corrosion and protection, 2018, 38(5): 478-486.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2017.184 OR https://www.jcscp.org/EN/Y2018/V38/I5/478

Fig.1 DSC curves of Cu_47.5Zr_47.5-_xAl₅Hf_x(x=0, 9.5) during heating at 10 K/min

Table 1 Glass transition temperature T_g and crystalliz-ation temperature T_x determined by DSC for Cu_47.5Zr_47.5-_xAl₅Hf_x(x=0, 9.5)

Fig.2 XRD patterns of Cu_47.5Zr_47.5-_xAl₅Hf_x(x=9.5) samplesbefore and after annealing at 923 K for 8~30 min

Fig.3 XRD patterns of Cu_47.5Zr_47.5-_xAl₅Hf_x(x=0) samples before and after annealing at different temperatures (623~923 K) for 30 min

Fig.4 XRD patterns of Cu_47.5Zr_47.5-_xAl₅Hf_x(x=9.5) samples before and after annealing at different temperatures (623~923 K) for 30 min

Fig.5 Microhardness of Cu_47.5Zr_47.5-_xAl₅Hf_x(x=9.5) samples annealed at 923 K for different time

Fig.6 Microhardness of Cu_47.5Zr_47.5-_xAl₅Hf_x(x=0, 9.5) sam-ples annealed at different temperatures for 30 min

Fig.7 Surface optical photographs of Cu_47.5Zr_47.5-_xAl₅Hf_x(x=0) (a) and Cu_47.5Zr_47.5-_xAl₅Hf_x(x=9.5) (b) before immersion test

Fig.8 Surface optical photographs of Cu_47.5Zr_47.5-_xAl₅Hf_x(x=0) sample after immersion in 3.5%NaCl solution for 72 h: (a) the whole surface area; (b) the upper-left area, showing severe corrosion; (c) the lower area, showing minor corrosion

Fig.9 Surface optical photographs of Cu_47.5Zr_47.5-_xAl₅Hf_x(x=9.5) sample after immersion in 3.5%NaCl solution for 72 h: (a) the whole surface area, (b) the middle area, (c) the upper area

Fig.10 SEM surface images of Cu_47.5Zr_47.5-_xAl₅Hf_x(x=0) sample after immersion in 3.5%NaCl solution for 120 h: (a) general area, (b) severe corrosion area, (c, d) the area covered by wire-like corrosion products

Fig.11 SEM surface images of Cu_47.5Zr_47.5-_xAl₅Hf_x(x=9.5) sample after immersion in 3.5%NaCl solution for 120 h: (a) the middle area, (b~d) the area covered with corrosion products

Fig.12 Potentiodynamic polarization curves of as-cast and 923 K annealed Cu_47.5Zr_47.5-_xAl₅Hf_x(x=0) samples in 3.5%NaCl solution

Fig.13 Potentiodynamic polarization curves of as-cast and 623~923 K annealed Cu_47.5Zr_47.5-_xAl₅Hf_x(x=9.5) sam-ples in 3.5%NaCl solution

Fig.14 Potentiodynamic polarization curves of as-cast and 923 K annealed Cu_47.5Zr_47.5-_xAl₅Hf_x(x=0, 9.5) samples in 3.5%NaCl solution

Table 2 EDS analysis results of Cu_47.5Zr_47.5-_xAl₅Hf_x(x=0) sample after immersion in 3.5%NaCl solution for 120 h

Table 3 EDS analysis results of Cu_47.5Zr_47.5-_xAl₅Hf_x(x=9.5)sample after immersion in 3.5%NaCl solution for 120 h

Table 4 Corrosion potential E_corr and corrosion current density I_corr determined by potentiodynamic polarization tests in 3.5%NaCl solution for as-cast and annealed Cu_47.5Zr_47.5-_xAl₅Hf_x(x=0, 9.5) samples

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