Corrosion behaviors of carbon steel induced by life activities of Phaeodactylum tricornutum in a marine environment,Materials and Corrosion

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Corrosion behaviors of carbon steel induced by life activities of Phaeodactylum tricornutum in a marine environment
Materials and Corrosion ( IF 1.6 ) Pub Date : 2020-12-08 , DOI: 10.1002/maco.202012183
Han Zhang _{1,

2} , Xiaoyan He _{1,

2,

3} , Yong Hua ₃ , Xiuqin Bai _{1,

2} , Chengqing Yuan _{1,

2}

Affiliation

Microbiologically influenced corrosion induced by bacteria has been studied for many years. Corrosion is known to be sensitive to the presence of microalgae, such as Phaeodactylum tricornutum. However, the life activity of P. tricornutum that influences the general and localized corrosion of carbon steel is not fully understood. The current study uses a combination of immersion tests and electrochemical experiments with a detailed surface characterization to reveal the naturally formed corrosion products with/without the presence of P. tricornutum. The results show that samples suffer from pitting corrosion and the averaged pit depths are approximately 15 μm under a light–dark cycle condition or a 24-h constant light condition. Meanwhile, the corrosion products are mainly comprised of γ-FeOOH and Fe₃O₄ in a constant light condition. However, γ-FeOOH, Fe₃O₄, and FeCO₃ are found in a light–dark cycle. This study proposes the fundamental mechanisms of the effect of P. tricornutum life activities on the corrosion performance of Q235 carbon steel, to fulfill the knowledge gaps of the presence of microalgae inducing the general and pitting corrosion of carbon steel.

中文翻译：

海洋环境中三角褐指藻生命活动对碳钢的腐蚀行为

多年来，人们一直在研究由细菌引起的受微生物影响的腐蚀。已知腐蚀对微藻的存在很敏感，例如三角褐指藻。然而，影响碳钢整体和局部腐蚀的三角褐指藻的生命活动尚不完全清楚。目前的研究结合了浸没试验和电化学实验以及详细的表面特征，以揭示有/没有三角褐指藻存在的自然形成的腐蚀产物. 结果表明，样品在明暗循环条件下或24小时恒定光照条件下发生点蚀，平均点蚀深度约为15 μm。 ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 同时，在恒定光照条件下，腐蚀产物主要由γ-FeOOH和Fe ₃ O _{4 组成}。然而，γ-FeOOH、Fe ₃ O ₄和 FeCO ₃存在于明暗循环中。本研究提出了三角藻生命活动对Q235碳钢腐蚀性能影响的基本机制，以弥补微藻的存在导致碳钢普遍腐蚀和点蚀的知识空白。

更新日期：2020-12-08

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