Effect of ferrous sulfate treatment on microbially influenced corrosion of CuNi 70/30 marine pipeline alloy by sulfate reducing bacteria†

IF 4.3 3区材料科学 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC ACS Applied Electronic Materials Pub Date : 2024-08-24 DOI:10.1039/D4EW00382A

M. A. Javed, W. C. Neil and S. A. Wade

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Abstract

This study investigates the effect of ferrous sulfate (FeSO₄) treatment on protective film formation and subsequent microbially influenced corrosion (MIC) of CuNi 70/30 pipeline alloy, a material commonly used in maritime platforms. CuNi 70/30 coupons were treated with FeSO₄ solution in potable water and seawater simulating a flow speed of 0.94 m s⁻¹ for 5 d. The treated coupons exhibited a protective iron oxyhydroxide, likely lepidocrocite (γ FeOOH), film on the surface. MIC performance was evaluated in modified Baar's medium with SRB for 28 d. Results revealed thicker SRB biofilm and increased MIC pitting attack on FeSO₄ treated coupons compared to untreated coupons. These findings suggest that FeSO₄ treatment may exacerbate MIC susceptibility in MIC-prone environments, highlighting the importance of carefully considering corrosion mitigation strategies in maritime platform applications.

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硫酸亚铁处理对受硫酸盐还原菌影响的 CuNi 70/30 海洋管道合金腐蚀的影响

本研究调查了硫酸亚铁（FeSO4）处理对 CuNi 70/30 管道合金（一种常用于海上平台的材料）保护膜形成和随后微生物影响腐蚀（MIC）的影响。将 CuNi 70/30 试样用 FeSO4 溶液在饮用水和模拟 0.94 m s-1 流速的海水中处理 5 d。结果表明，与未处理的试样相比，FeSO4 处理过的试样上 SRB 生物膜更厚，MIC 点蚀更严重。这些研究结果表明，FeSO4 处理可能会加剧 MIC 易发环境中的 MIC 易感性，从而突出了在海洋平台应用中仔细考虑腐蚀缓解策略的重要性。

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