Erosion Corrosion Behavior in Flowing Seawater for 70Cu-30Ni Alloy Pipelines with Chemical Conversion Film Preformed in Flowing FeSO4 Solution

doi:10.11902/1005.4537.2022.156

Journal of Chinese Society for Corrosion and protection

2023, Vol. 43

Issue (3): 561-568 DOI: 10.11902/1005.4537.2022.156

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Erosion Corrosion Behavior in Flowing Seawater for 70Cu-30Ni Alloy Pipelines with Chemical Conversion Film Preformed in Flowing FeSO₄ Solution

YANG Xinyu¹^,², LI Zhen¹, DUAN Tigang¹(

), HUANG Guosheng¹, MA Li¹, LIU Feng¹, JIANG Dan¹

^1.State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Qingdao 266237, China
^2.College of Material Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China

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Abstract

A pre-chemical conversion film on the inner walls of 70Cu-30Ni alloy pipeline was first prepared with a flowing FeSO₄ solution, and then of which the erosion corrosion behavior in flowing seawater of various speeds was investigated by means of seawater circulation loop. The result showed that a chemical conversion film is obtained during the immersing- and flushing-process of the 200 mg/L FeSO₄ solution in conditions: flowing speed 0.5 m/s, pH 6.0, at 25 °C for 30 d, which is a composite film composed of an inner layer of NiO-Ni(OH)₂, a compact middle layer of Cu₂O-FeOOH and a loose outer layer of Fe₂O₃-FeOOH. Long-term seawater erosion corrosion test results showed that being suffered from flowing sea water of 0.5 and 1.5 m/s, the chemical conversion film covered pipe lines display relative sound anticorrosion performance with only slightly thinning of the top loose layer of the film, while with the increasing seawater flowing rate up to 2.5 m/s the loose layer on top of the conversion film is significantly thinned with locally spalling off, thus exposing the compact middle layer underneath. XPS analysis results showed that the chemical conversion films had been suffered from erosion corrosion of high-speed flowing seawater display higher amount of Ni, Cu₂O and FeOOH on the conversion film surface. Electrochemical impedance results showed that the charge transfer resistances of the chemical conversion films varied in the following descending order: from 2.28×10⁵ Ω·cm², 8.77×10⁴ Ω·cm² to 6.51×10⁴ Ω·cm², after being subjected to erosion-corrosion test by seawater of flowing speeds of 0.5, 1.5 to 2.5 m/s, respectively.

Key words: 70Cu-30Ni alloy pipeline ferrous sulfate preforming film anticorrosive Cu₂O-FeOOH composite film long-term erosion corrosion

Received: 19 May 2022 32134.14.1005.4537.2022.156

ZTFLH:

TG174.4

Corresponding Authors: DUAN Tigang, E-mail: duantigang@sunrui.net

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	YANG Xinyu
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	MA Li
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	JIANG Dan

Cite this article:

YANG Xinyu, LI Zhen, DUAN Tigang, HUANG Guosheng, MA Li, LIU Feng, JIANG Dan. Erosion Corrosion Behavior in Flowing Seawater for 70Cu-30Ni Alloy Pipelines with Chemical Conversion Film Preformed in Flowing FeSO₄ Solution. Journal of Chinese Society for Corrosion and protection, 2023, 43(3): 561-568.

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https://www.jcscp.org/EN/10.11902/1005.4537.2022.156 OR https://www.jcscp.org/EN/Y2023/V43/I3/561

Fig.1 Photographs of 70Cu-30Ni with FeSO₄ films preformed after treatment for 4 d (a), 20 d (b) and 30 d (c)

Fig.2 SEM images of FeSO₄ films preformed on 70Cu-30Ni after treatment for 4 d (a), 20 d (b) and 30 d (c)

Fig.3 Corrosion morphologies of 70Cu-30Ni with preformed FeSO₄ films after erosion for 3 months at the flow rates of 0.5 m/s (a), 1.5 m/s (b) and 2.5 m/s (c)

Fig.4 SEM images of 70Cu-30Ni with preformed FeSO₄ film after erosion for 3 months at the flow rates of 0.5 m/s (a), 1.5 m/s (b) and 2.5 m/s (c)

Fig.5 XPS results of the film preformed on 70Cu-30Ni after 30 d treatment: (a) depth profiles of main elements, and fine spectra of (b) Cu 2p, (c) Ni 2p and (d) Fe 2p

Fig.6 XPS results of 70Cu-30Ni with preformed FeSO₄ film after erosion at different flow rates: (a) survey scanning spectra and fine spectra of (b) Cu 2p, (c) Ni 2p and (d) Fe 2p

Table 1 XPS analysis results of preformed FeSO₄ film on 70Cu-30Ni after three-month erosion.

Fig.7 Potentiodynamic polarization curves of 70Cu-30Ni with preformed FeSO₄ film after erosion at different flow rates

Fig.8 EIS plots of 70Cu-30Ni with preformed FeSO₄ film after erosion at different flow rate

Table 2 Fitting results of EIS of 70Cu-30Ni with preformed FeSO₄ film after erosion at different

Fig.9 Illustrations of the formation process and erosion corrosion mechanism of FeSO₄ film on 70Cu-30Ni pipeline alloy

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