Influence of Seawater Flow Speed on Galvanic Corrosion Behavior of B10/B30 Alloys Coupling

doi:10.11902/1005.4537.2022.109

Journal of Chinese Society for Corrosion and protection

2023, Vol. 43

Issue (2): 391-398 DOI: 10.11902/1005.4537.2022.109

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Influence of Seawater Flow Speed on Galvanic Corrosion Behavior of B10/B30 Alloys Coupling

XING Shaohua¹(

), LIU Jinzeng¹^,², BAI Shuyu¹, QIAN Yao¹^,², ZHANG Dalei², MA Li¹

^1.State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Qingdao 266237, China
^2.School of Materials Science and Engineering, China University of Petroleum (East China), Qingdao 266580, China

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Abstract

Copper-nickel alloys B10 and B30 are the main materials of marine seawater piping and coolers respectively. The two alloys have different corrosion potential due to the different nickel content, and thus there is a risk of galvanic corrosion for the couple of B10 and B30 when the pipes are connected to the cooling equipment. Especially in the working conditions of flowing seawater, the diffusion of corrosive media and corrosion products may be aggravated. In order to control the corrosion of the galvanic couple B10/B30 and prolong the service life of seawater pipeline, in this paper, the galvanic potential and galvanic current of the couple B10 and B30 in static and flowing seawater (1, 3 and 5 m/s) are monitored in situ, to acquire the variation of the galvanic corrosion rate with time and flow rate. The results show that, in static seawater, the galvanic corrosion tendency of the couple B10/B30 is small, and the corrosion rate of B10 as the anode slightly increases at the beginning of the experiment, while after 40 h test, the galvanic current approaches zero. In flowing seawater, the anodic polarization current density of B10 and the cathodic polarization current density of B30 increases significantly, B10 always acts as anode and the galvanic corrosion is significantly intensified, the galvanic corrosion rate at flow speed 1 m/s is 79 times that in static seawater. As the flow speed of seawater increases, the current density of the couple B10/B30 increases and the corrosion rate of the couples accelerates. The galvanic corrosion rate of the couple B10/B30 is controlled by both the B10 anodic reaction and the B30 cathodic reaction according to mix potential analysis.

Key words: seawater pipeline copper nickel alloy flowing seawater galvanic corrosion

Received: 14 April 2022 32134.14.1005.4537.2022.109

ZTFLH:

TG174

About author: XING Shaohua, E-mail: xingsh@sunrui.net

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Cite this article:

XING Shaohua, LIU Jinzeng, BAI Shuyu, QIAN Yao, ZHANG Dalei, MA Li. Influence of Seawater Flow Speed on Galvanic Corrosion Behavior of B10/B30 Alloys Coupling. Journal of Chinese Society for Corrosion and protection, 2023, 43(2): 391-398.

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https://www.jcscp.org/EN/10.11902/1005.4537.2022.109 OR https://www.jcscp.org/EN/Y2023/V43/I2/391

Fig.1 Corrosion potential of B10 (a) and B30 (b) samples in different flow rate seawater

Fig.2 Variation curves of galvanic potential of B10/B30 in different flow rate seawater with time

Fig.3 Galvanic current density of B10/B30 in different flow rate seawater with time

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

Fig.5 Corrosion morphologies of B10 (a-d), B30 (e, h) couple in seawater at 0 m/s (a, e), 1 m/s (b, f), 3 m/s (c, g) and 5 m/s (d, h) flow rates

Fig.6 SEM micrographs of coupled B10 corrosion at 0 m/s (a), 1 m/s (b), 3 m/s (c) and 5 m/s (d) flow rates

Table 1 Elemental composition of corrosion products of coupled B10

Fig.7 Surface micro-morphologies of coupling B10 after removing corrosion products: (a) 0 m/s, (b) 1 m/s, (c) 3 m/s, (d) 5 m/s

Fig.8 Corrosion kinetics of B10/B30 couple at different flow rate seawater: (a) 0 and 1 m/s, (b) 3 and 5 m/s, (c) different periods at 0 m/s, (d) different periods at 1 m/s

Fig.9 Mechanism of galvanic corrosion of B10/B30 couple in static seawater

Fig.10 Galvanic corrosion mechanism of B10/ B30 couple in flowing seawater

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