Erosion-corrosion Characteristics of B10 Cu-Ni Alloy Seawater Control Valve in Flowing Seawater Conditions

doi:10.11902/1005.4537.2025.084

Journal of Chinese Society for Corrosion and protection

2026, Vol. 46

Issue (1): 283-290 DOI: 10.11902/1005.4537.2025.084

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Erosion-corrosion Characteristics of B10 Cu-Ni Alloy Seawater Control Valve in Flowing Seawater Conditions

MA Xiao¹, XU Xuelei¹(

), TONG Hongtao¹, WANG Xin¹, ZHAO Mingyu¹, WANG Xuan¹, SHEN Jie², LIU Guangyi¹(

)

^1.State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Qingdao 266237, China
^2.Suzhou Delan Energy Technology Co. Ltd., Suzhou 215131, China

Cite this article:

MA Xiao, XU Xuelei, TONG Hongtao, WANG Xin, ZHAO Mingyu, WANG Xuan, SHEN Jie, LIU Guangyi. Erosion-corrosion Characteristics of B10 Cu-Ni Alloy Seawater Control Valve in Flowing Seawater Conditions. Journal of Chinese Society for Corrosion and protection, 2026, 46(1): 283-290.

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Abstract

B10 Cu-Ni alloy is widely used in marine seawater pipeline systems due to its excellent corrosion and erosion resistance. However, in flowing seawater environments, it still faces challenges such as erosion-corrosion. Herein, the corrosion behavior of a B10 Cu-Ni alloy control valve in actual seawater service conditions was assessed by integrating field service analysis, corrosion morphology characterization, and computational fluid dynamics (CFD) simulations. The results indicate that the distribution of seawater flow velocity inside the control valve is highly non-uniform by different valve opening degrees. In certain regions, the local flow velocity exceeds 8 m/s, significantly surpassing the critical velocity of B10 Cu-Ni alloy, leading to intensified turbulence and shear stress effects. Consequently, high-flow regions develop horseshoe-shaped corrosion pits, while low-flow regions exhibit fish-scale-like corrosion patterns.

Key words: seawater control valve B10 Cu-Ni alloy erosion-corrosion

Received: 12 March 2025 32134.14.1005.4537.2025.084

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	Articles by authors
	MA Xiao
	XU Xuelei
	TONG Hongtao
	WANG Xin
	ZHAO Mingyu
	WANG Xuan
	SHEN Jie
	LIU Guangyi

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https://www.jcscp.org/EN/10.11902/1005.4537.2025.084 OR https://www.jcscp.org/EN/Y2026/V46/I1/283

Fig.1 Schematic diagram of the seawater control valve structure

Fig.2 Schematic diagram of wall thickness measurement points: (a) left view, (b) front view

Fig.3 Wall thickness variation curve at different positions of the valve wall

Fig.4 Metallographic microstructure characterization of B10 Cu-Ni valve: (a) low magnification image, (b) high magnification image

Fig.5 Cross-sectional view of valve wall along 0-point (a) and 6-point (b) directions

Fig.6 Brown corrosion products in severely corroded areas of valve wall at 3-point (a) and 9-point (b) directions

Fig.7 Micromorphology and elemental characterization of brown deposits in severely corroded areas at 3-point (a) and 9-point (b) directions of valve wall

Fig.8 Micromorphology and elemental characterization of corrosion products after acid cleaning in severely corroded areas at 3-point (a) and 9-point (b) directions of valve wall

Fig.9 SolidWorks software simulates the seawater flow velocity distribution field in the valve body under different opening degrees: (a, d) 30% opening, (b, e) 40% opening, (c, f) 50% opening

Fig.10 Schematic diagram of the corrosion mechanism of the valve wall at the 3-point (a, c) and 9-point (b, d) directions during service under seawater erosion

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