Galvanic Corrosion Behavior of ZCuSn5Pb5Zn5/B10 Couple in Flowing Seawater

doi:10.11902/1005.4537.2022.412

Journal of Chinese Society for Corrosion and protection

2023, Vol. 43

Issue (6): 1339-1348 DOI: 10.11902/1005.4537.2022.412

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Galvanic Corrosion Behavior of ZCuSn5Pb5Zn5/B10 Couple in Flowing Seawater

XING Shaohua¹(

), LIU Zhongye², LIU Jinzeng³, BAI Shuyu¹, QIAN Yao⁴, ZHANG Dalei⁵

^1.State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Qingdao 266237, China
^2.Military Representative Office of Naval Equipment Department in Xiangtan Region, Xiangtan 411100, China
^3.Offshore Oil Engineering (Qingdao) Co., Ltd., Qingdao 266520, China
^4.Qingdao Jimo District Bureau of Industry and Information Technology, Qingdao 266205, China
^5.School of Materials Science and Engineering, China University of Petroleum (East China), Qingdao 266580, China

Cite this article:

XING Shaohua, LIU Zhongye, LIU Jinzeng, BAI Shuyu, QIAN Yao, ZHANG Dalei. Galvanic Corrosion Behavior of ZCuSn5Pb5Zn5/B10 Couple in Flowing Seawater. Journal of Chinese Society for Corrosion and protection, 2023, 43(6): 1339-1348.

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Abstract

Valve is one of the most important components for seawater pipeline, and is widely used in ship, but it suffers from serious corrosion, which leads to leaking or unclosing. Galvanic corrosion between ZCuSn5Pb5Zn5 and B10 is the main cause of such corrosion. In this paper, the galvanic corrosion of the couple ZCuSn5Pb5Zn5/B10 in flowing seawater and the galvanic corrosion mechanism is assessed by means of electrochemical method, SEM and EDS. The results suggest that, in static seawater, the galvanic corrosion rate between ZCuSn5Pb5Zn5 and B10 is very small, the relevant anode and cathode are reversed many times. In flowing seawater of 1, 3 and 5 m/s, the galvanic corrosion rate of ZCuSn5Pb5Zn5 obviously increases, which is 22, 49 and 69 times of that in static seawater respectively. In flowing seawater, the diffusion rate of dissolved oxygen and corrosion products is accelerated and the relevant anodic- and cathodic-reactions are both accelerated, thus the galvanic corrosion rate increases. The galvanic corrosion between ZCuSn5Pb5Zn5 and B10 is controlled by both the ZCuSn5Pb5Zn5 anodic reaction and the B10 cathodic reaction. With the gradually depositions of corrosion products, the anodic- and cathodic-reactions are inhibited, however when the flowing rate is more than 3 m/s, the deposition of corrosion products turns to be difficult, thus cannot provide proper barrier effect to the galvanic corrosion.

Key words: seawater pipelines valve copper nickel alloy flowing seawater galvanic corrosion

Received: 27 December 2022 32134.14.1005.4537.2022.412

ZTFLH:

TG174

Corresponding Authors: XING Shaohua, E-mail:xingsh@sunrui.net

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	XING Shaohua
	LIU Zhongye
	LIU Jinzeng
	BAI Shuyu
	QIAN Yao
	ZHANG Dalei

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https://www.jcscp.org/EN/10.11902/1005.4537.2022.412 OR https://www.jcscp.org/EN/Y2023/V43/I6/1339

Fig.1 Schematic diagram of experimental equipment: (a) electrolytic cell and (b) experimental device of pipeline corrosion testing in flowing water (1-Ag/AgCl, 2-B10, 3-ZCuSn5Pb5Zn5, 4-ZCuSn5Pb5Zn5, 5-B10)

Fig.2 Corrosion potential and galvanic corrosion potential in different flow rate seawater: (a) ZCuSn5Pb5Zn5 and B10, (b) ZCuSn5Pb5Zn5/B10

Fig.3 Variation curve of galvanic current of ZCuSn5Pb5Zn5/B10 in different flow rate seawater: (a) static seawater, (b) flowing seawater

Fig.4 Variation curve of galvanic current density and galvanic potential with flow velocity

Fig.5 SEM micrographs of ZCuSn5Pb5Zn5 with corrosion productions: (a) 0 m/s, (b) 1 m/s, (c) 3 m/s, (d) 5 m/s

Fig.6 EDS analysis of elemental composition of ZCuSn5Pb5Zn5 corrosion products: (a) point A in Fig.5d, (b) point B in Fig.5d

Fig.7 3D morphologies of ZCuSn5Pb5Zn5 without corrosion products: (a) 0 m/s, (b) 1 m/s, (c) 3 m/s, (d) 5 m/s

Fig.8 SEM micrographs of ZCuSn5Pb5Zn5 without corrosion products: (a) 0 m/s, (b) 1 m/s, (c) 3 m/s, (d) 5 m/s

Fig.9 SEM micrographs of B10 with corrosion productions: (a) 0 m/s, (b) 1 m/s, (c) 3 m/s, (d) 5 m/s

Fig.10 EDS analysis of elemental composition of B10 corrosion products of A point (a) and B point (b) in Fig.9d

Fig.11 SEM micrographs of B10 without corrosion products: (a) 0 m/s, (b) 1 m/s, (c) 3 m/s, (d) 5 m/s

Fig.12 Corrosion kinetics of ZCuSn5Pb5Zn5/B10 couple in different flow rate seawater

Fig.13 Mechanism of galvanic corrosion of ZCuSn5Pb5Zn5/B10 couple in static seawater

Fig.14 Mechanism of galvanic corrosion of ZCuSn5Pb5Zn5/B10 couple in in 1 m/s flowing seawater

Fig.15 Mechanism of galvanic corrosion of ZCuSn5Pb5Zn5/B10 couple in in 3 m/s flowing seawater

Fig.16 Mechanism of galvanic corrosion of ZCuSn5Pb5Zn5/B10 couple in in 5 m/s flowing seawater

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