Effect of Er on Corrosion Behavior of Marine Engineering 5052 Al-alloy

doi:10.11902/1005.4537.2020.190

Journal of Chinese Society for Corrosion and protection

2021, Vol. 41

Issue (5): 686-690 DOI: 10.11902/1005.4537.2020.190

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Effect of Er on Corrosion Behavior of Marine Engineering 5052 Al-alloy

ZHANG Xin¹(

), LIN Muyan¹^,², YANG Guangheng¹, WANG Zehua¹, SHAO Jia¹, ZHOU Zehua¹

^1.College of Mechanics and Materials, Hohai University, Nanjing 211100, China
^2.School of Materials Science and Engineering, Zejiang University, Hangzhou 315100, China

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Abstract

The effect of Er addition on the corrosion behavior of 5052 Al-alloy were investigated by means of electrochemical measurement and immersion test. as well as optical microscope (OM), scanning electron microscope (SEM) and energy disperse spectroscopy (EDS). The results indicated that with the increase of Er addition, the corrosion resistance of 5052 Al-alloy increased first, and then decreased. Among others, the 5052 Al-alloy with 0.4% Er addition had the best corrosion resistance. It is obvious that, a proper amount of Er addition could improve the corrosion resistance of 5052 Al-alloy effectively, whereas the excessive Er addition would increase the corrosion rate and reduce the corrosion resistance.

Key words: 5052 Al-alloy rare metal Er corrosion behavior pitting corrosion

Received: 12 October 2020

ZTFLH:

TG174

Fund: National Natural Science Foundation of China(51909071);Natural Science Foundation of Jiangsu Province(BK20190493);Fundamental Research Funds for the Central Universities(B200202133)

Corresponding Authors: ZHANG Xin E-mail: zhangxin.007@163.com

About author: ZHANG Xin, E-mail: zhangxin.007@163.com

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Cite this article:

ZHANG Xin, LIN Muyan, YANG Guangheng, WANG Zehua, SHAO Jia, ZHOU Zehua. Effect of Er on Corrosion Behavior of Marine Engineering 5052 Al-alloy. Journal of Chinese Society for Corrosion and protection, 2021, 41(5): 686-690.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2020.190 OR https://www.jcscp.org/EN/Y2021/V41/I5/686

Table 1 Chemical compositions of 5052 Al-alloy (mass fraction / %)

Fig.1 Surface morphologies of 5052 Al-alloy with different Er addition: (a) A1; (b) A2; (c) A3; (d) A4; (e) A5; (f) A6

Table 2 EDS analysis of 5052 Al-alloy with different Er addition (mass fraction / %)

Fig.2 Surface morphologies of 5052 Al-alloys with different Er addition after immersion test: (a) A1; (b) A2; (c) A3; (d) A4; (e) A5; (f) A6

Fig.3 Surface morphologies of 5052 Al-alloys with different Er addition after immersion: (a) A1; (b) A3

Table 3 EDS analysis of 5052 Al-alloy with different Er addition in pitting area (mass fraction / %)

Fig.4 Potentiodynamic polarization curves of 5052 Al-alloy with different Er addition

Table 4 E_corr, I_corr, E_pit values of 5052 Al-alloy with different Er addition

Fig.5 Nyquist diagram of 5052 Al-alloys with different Er addition

No.	R_sol / Ω·cm²	Q_p / Ω^-1·cm^-2·s^-1	n₁	R_t / Ω·cm²	Q_{dl (pit}₎ / Ω^-1·cm^-2·s^-1	n₂	R_{t (pit)} / Ω·cm²
A1	7.341	9.931 $×$ 10^-6	0.9029	1.705 $×$ 10⁴	10.96 $×$ 10^-6	0.8940	2.330 $×$ 10⁴
A2	8.915	9.162 $×$ 10^-6	0.9062	1.883 $×$ 10⁴	8.36 $×$ 10^-6	0.9558	2.464 $×$ 10⁴
A3	11.01	13.36 $×$ 10^-6	0.9190	2.528 $×$ 10⁴	5.634 $×$ 10^-6	0.8805	5.408 $×$ 10⁴
A4	9.278	10.22 $×$ 10^-6	0.8923	2.134 $×$ 10⁴	9.64 $×$ 10^-6	0.9962	2.162 $×$ 10⁴
A5	9.091	9.347 $×$ 10^-6	0.8798	1.218 $×$ 10⁴	10.37 $×$ 10^-6	0.8318	2.236 $×$ 10⁴
A6	8.293	7.278 $×$ 10^-6	0.8684	1.105 $×$ 10⁴	12.07 $×$ 10^-6	0.8697	1.456 $×$ 10⁴

Table 5 Parameters of the equivalent elements in equivalent circuit for 5052 Al-alloys with different Er addition

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