Corrosion Characteristics of Carbon Steel in Simulated Marine Atmospheres

doi:10.11902/1005.4537.2021.300

Journal of Chinese Society for Corrosion and protection

2022, Vol. 42

Issue (5): 851-855 DOI: 10.11902/1005.4537.2021.300

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Corrosion Characteristics of Carbon Steel in Simulated Marine Atmospheres

WAN Ye(

), SONG Fangling, LI Lijun

School of Materials Science and Engineering, Shenyang Jianzhu University, Shenyang 110168, China

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Abstract

Marine atmospheric parameters, such as UV light irradiation, temperature, relative humidity, and chloride ions, may affect the corrosion behavior of metallic materials. The effects of the UV lights irradiation and chloride ions on pitting corrosion behaviors of carbon steel were investigated in a simulated marine atmospheres. The 3D images of the pitting were revealed via a combination of dual-beam focused ion beam system with scanning electron microscope (FIB/SEM) system, while the 3D stereoscopic vision was examined by using an X-ray micro-tomography. The results show that UV light irradiation could induce passivation of the carbon steel beneath a thin liquid film, and thus a thin oxide film might form on the carbon steel surface. Pitting corrosion occurred due to the aggressive chloride ions piercing through the oxide film on the surface of carbon steel. Three dimensional (3D) images demonstrated that the flowers-like pitting corrosion products with core-shell structure were formed as the pitting developed. The elemental distributions in the pitting areas exhibited high content of chloride and low content of oxygen in the core, while low content of chloride and high content of oxygen in the shell. The content of chloride ions was the highest in the bottoms of the pits, which then resulted in a pitting mechanism related with autocatalytic reaction.

Key words: carbon steel pitting corrosion marine atmosphere chloride ion

Received: 25 October 2021

ZTFLH:

TG174

Fund: Liaoning Revitalization Talent Program(XLYC2002005);Scientific Research Funds of Liaoning Provincial Education Department(lnjc202016);Scientific Research Funds of Liaoning Provincial Education Department(lnqn202019)

Corresponding Authors: WAN Ye E-mail: ywan@sjzu.edu.cn

About author: WAN Ye, E-mail: ywan@sjzu.edu.cn

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Cite this article:

WAN Ye, SONG Fangling, LI Lijun. Corrosion Characteristics of Carbon Steel in Simulated Marine Atmospheres. Journal of Chinese Society for Corrosion and protection, 2022, 42(5): 851-855.

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https://www.jcscp.org/EN/10.11902/1005.4537.2021.300 OR https://www.jcscp.org/EN/Y2022/V42/I5/851

Fig.1 Surface images of the carbon steel deposited with NaCl and exposed in the cleaned air for 24 h (a, b), and 3D cross-sectional image with line scans of O, Cl and Fe elemental distributions along the yellow line passing through one corrosion swell of Fig.1b (c)

Fig.2 Front view of the 3D cross-sectional XRT image of the corrosion flower with the XRT sample stub (a), and vertical views of the corrosion flower without the sample stub (b)

Fig.3 Surface image of carbon steel deposited with NaCl in the exposure chamber with cleaned air with the UVA light (185 nm, 0.15 W/m²) for 24 h (a), 3D cross-sectional image with longitudinal (b) and horizontally (c) line scans of O, Cl and Fe elemental distributions along the respectively yellow lines passing through the corrosion swell

Fig.4 Surface images of carbon steel deposited with NaCl in the exposure chamber with cleaned air with 245 nm (a) and 365 nm (c) UVA light (0.15 W/m²) for 24 h respectively and corresponding to the 3D cross-sectional image with longitudinal line scans of O, Cl and Fe elemental distributions along the respectively yellow line passing through the corrosion swell (b, d)

Fig.5 Potentiodynamic scan of steel in 0.6 M NaCl thin electrolyte layer (UV light: 365 nm, 0.3 mW/cm²)

Table 1 Electrochemical fitting parameters from Fig.5 by CorrView2 software

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