Corrosion Behavior of Cu-15Ni-8Sn Alloy in 3.5%NaCl Solution Containing S2-

doi:10.11902/1005.4537.2024.355

Journal of Chinese Society for Corrosion and protection

2025, Vol. 45

Issue (5): 1408-1416 DOI: 10.11902/1005.4537.2024.355

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Corrosion Behavior of Cu-15Ni-8Sn Alloy in 3.5%NaCl Solution Containing S^2-

FAN Shilin¹^,², DU Juan²(

), YANG Shaodan³, ZHOU Yanjun⁴, SONG Kexing², ZHANG Guoshang², YUE Pengfei², YANG Ran⁴, WANG Xiaojun¹

1 Zhengzhou Research Institute of Harbin Institute of Technology, Zhengzhou 450046, China
2 Institute of Materials Science, Henan Academy of Sciences, Zhengzhou 450046, China
3 School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450046, China
4 School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471023, China

Cite this article:

FAN Shilin, DU Juan, YANG Shaodan, ZHOU Yanjun, SONG Kexing, ZHANG Guoshang, YUE Pengfei, YANG Ran, WANG Xiaojun. Corrosion Behavior of Cu-15Ni-8Sn Alloy in 3.5%NaCl Solution Containing S^2-. Journal of Chinese Society for Corrosion and protection, 2025, 45(5): 1408-1416.

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Abstract

The corrosion behavior of Cu-15Ni-8Sn alloy in 3.5%NaCl solution containing 10 mg/L sulfur ions (S^2-) was assessed by means of immersion tests, electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and X-ray photoelectron spectroscopy (XPS). The results show that after 30 d of immersion in 3.5%NaCl solution without sulfur ions, a stable passivation film is formed on the surface of Cu-15Ni-8Sn alloy, mainly composed of basic copper chloride Cu₂(OH)₃Cl. The passivation film can effectively prevent the further attack of Cl^-, and the average corrosion rate is 0.02235 g·m^-2·h^-1. In sulfur ion-containing solutions, the sulfides (Cu₂S and CuS) formed in the initial stage provide a certain degree of protection. However, with the extension of time, after the alloy is immersed and corroded for 30 days in the solution containing sulfur ions, the corrosion weight loss rate is 0.03418 g·m^-2·h^-1, which is higher than that in the solution without sulfur ions. the corrosion products are turn into the mixture of basic copper chloride (Cu₂(OH)₃Cl), copper sulfate (CuSO₄), copper sulfide (CuS), nickel hydroxide (Ni(OH)₂), and tin sulfide (SnS₂). This porous corrosion film provides much weaker protection for the alloys, and the deterioration and rupture of the sulfide film further aggravate the corrosion process, making the average corrosion rate of the alloy in the sulfur ion-containing environment higher than that in a sulfur ion-free environment.

Key words: Cu-15Ni-8Sn alloy sulfide-induced corrosion corrosion behavior

Received: 31 October 2024 32134.14.1005.4537.2024.355

ZTFLH:

TG172.5

Fund: Research Start-up Funding of Henan Academy of Sciences(231817003);Henan Provincial Natural Science Foundation(242300420030)

Corresponding Authors: DU Juan, E-mail: juan_du@hnas.ac.cn

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	Articles by authors
	FAN Shilin
	DU Juan
	YANG Shaodan
	ZHOU Yanjun
	SONG Kexing
	ZHANG Guoshang
	YUE Pengfei
	YANG Ran
	WANG Xiaojun

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2024.355 OR https://www.jcscp.org/EN/Y2025/V45/I5/1408

Fig.1 Corrosion rates of Cu-15Ni-8Sn alloy during 30 d immersion in 3.5%NaCl solutions containing 0 and 10 mg/L Na₂S

Fig.2 Nyquist plots (a, d) and Bode plots (b, c, e, f) of Cu-15Ni-8Sn alloy after immersion for different time in 3.5%NaCl solutions containing 0 mg/L (a-c) and 10 mg/L (d-f) Na₂S

Fig.3 Equivalent circuits diagrams for fitting EIS of Cu-15Ni-8Sn alloy immersed in 3.5%NaCl solutions with 0 mg/L Na₂S for 1-30 d and 10 mg/L Na₂S for 6-30 d (a), and 10 mg/L Na₂S for 1-3 d (b)

Table 1 Fitting parameters of EIS of Cu-15Ni-8Sn alloy after immersion in 3.5%NaCl solution without addition of Na₂S for different time

Table 2 Fitting parameters of EIS of Cu-15Ni-8Sn alloy after immersion in 3.5%NaCl aqueous solution containing 10 mg/L Na₂S for different time

Fig.4 Surface micro-morphologies and elemental contents of Cu-15Ni-8Sn alloy after immersion in 3.5%NaCl solutions containing 0 mg/L (a-d) and 10 mg/L (e-h) Na₂S for 1 d (a, e), 6 d (b, f), 18 d (c, g) and 30 d (d, h)

Fig.5 Cross-sectional morphologies and element distributions of Cu-15Ni-8Sn alloy after 30 d immersion in 3.5%NaCl solutions containing 0 mg/L (a) and 10 mg/L (b) Na₂S

Fig.6 XRD patterns of Cu-15Ni-8Sn alloy after 30 d immersion in 3.5%NaCl solutions containing 0 mg/L and 10 mg/L Na₂S

Fig.7 XPS full spectra of Cu-15Ni-8Sn alloy after 30 d immersion in 3.5%NaCl solutions containing 0 mg/L (a) and 10 mg/L (b) Na₂S

Fig.8 XPS spectra of corrosion products formed on Cu-15Ni-8Sn alloy after 30 d immersion in 3.5%NaCl solutions containing 0 mg/L (a1-d1) and 10 mg/L (a2-d2) Na₂S

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