Galvanic Corrosion Behavior of 20# Steel/Tin Bronze Couple in Flowing Seawater

doi:10.11902/1005.4537.2022.001

Journal of Chinese Society for Corrosion and protection

2023, Vol. 43

Issue (1): 127-134 DOI: 10.11902/1005.4537.2022.001

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Galvanic Corrosion Behavior of 20# Steel/Tin Bronze Couple in Flowing Seawater

LIU Jinzeng¹^,², XING Shaohua¹(

), 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

The galvanic corrosion of the couples of 20# steel penetrating cabin parts and tin bronze valve is the severely corroded parts in the sea water pipeline system of ships. In order to control the galvanic corrosion of the couple 20# steel/tin bronze to extend the life of the seawater pipeline system, the galvanic potential and galvanic current of the couple 20# steel pipe/tin bronze pipe in static and flowing sea water of 1, 3, and 5 m/s were assessed in-situ, respectively. Whilst, the variations of galvanic corrosion rate with time and flow rate were acquired; At the same time, scanning electron microscope (SEM) and laser Raman spectrometer were used to analyze the corrosion morphology and the composition of corrosion products. The results show that there is an obvious galvanic corrosion tendency between 20# steel and ZCuSn5Pb5Zn5 in seawater of different flow rates, namely 20# steel acts as the anode, and presents intensified corrosion tendency, while ZCuSn5Pb5Zn5 acts as the cathode. The anodic polarization current density of 20# steel and the cathodic polarization current density of ZCuSn5Pb5Zn5 increase significantly in flowing seawater rather than in static seawater, therewith the galvanic corrosion is significantly intensified. The galvanic couple in flowing seawater of 1 m/s presents a corrosion rate 17.5 times higher than that in static seawater. When the seawater flow rate reaches 5 m/s, a corrosion product scale with higher compactness and low activity is formed on the surface of 20# steel, and the galvanic corrosion rate decreases.

Key words: galvanic corrosion flowing sea water 20# steel tin bronze in-situ measurement

Received: 01 January 2022 32134.14.1005.4537.2022.001

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	Jinzeng LIU
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Cite this article:

LIU Jinzeng, XING Shaohua, QIAN Yao, ZHANG Dalei, MA Li. Galvanic Corrosion Behavior of 20# Steel/Tin Bronze Couple in Flowing Seawater. Journal of Chinese Society for Corrosion and protection, 2023, 43(1): 127-134.

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https://www.jcscp.org/EN/10.11902/1005.4537.2022.001 OR https://www.jcscp.org/EN/Y2023/V43/I1/127

Fig.1 Schematic diagrams of pipeline scouring device (a) and electrolytic cell device (b)

Fig.2 Average corrosion potentials of 20# steel and ZCuSn5Pb5Zn5 alloy in seawater with different flow rates

Fig.3 Variations of galvanic potential and galvanic current of 20# steel/ZCuSn5Pb5Zn5 alloy couple with corrosion time

Fig.4 Galvanic potentials (a) and galvanic current densities (b) of 20# steel/ZCuSn5Pb5Zn alloy couple in seaw-ater with different flow rates

Fig.5 Variation curves of galvanic current density and galvanic potential of the couple with the flow rate of seawater

Fig.6 Corrosion morphologies of coupled 20# steel after scouring in seawater with the flow rates of 0 m/s (a), 1 m/s (b), 3 m/s (c) and 5 m/s (d)

Fig.7 3D morphologies of coupled 20# steel after corrosion in seawater with 1 m/s (a), 3 m/s (b) and 5 m/s (c) flow rates and then removing the surface corrosion products by pickling

Fig.8 Micromorphologies of anodic 20# steel after corrosion in seawater with the flow rates of 1 m/s (a), 3 m/s (b) and 5 m/s (c)

Fig.9 Raman spectroscopies of surface corrosion products of 20# steel after corrosion in seawater with the flow rates of 1 m/s (a),3 m/s (b) and 5 m/s (c)

Fig.10 Micromorphologies of 20# steel after corrosion in seawater with 0 m/s (a), 1 m/s (b), 3 m/s (c) and 5 m/s (d) flow rates and then removing the corrosion products by pickling

Fig.11 Polarization curves of two test materials in seawater with different flow rates

Fig.12 Mechanism diagrams of galvanic corrosion of 20# steel/ZCuSn5Pb5Zn5 couple in seawater

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