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Article

Immersion Behavior of Carbon Steel, Phosphate Carbon Steel and Phosphate and Painted Carbon Steel in Saltwater

Faculty of Materials Science and Engineering, Gheorghe Asachi Technical University, 700050 Iași, Romania
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Materials 2021, 14(1), 188; https://doi.org/10.3390/ma14010188
Received: 9 December 2020 / Revised: 25 December 2020 / Accepted: 29 December 2020 / Published: 2 January 2021
(This article belongs to the Special Issue Corrosion Resistance Enhancement of the Materials Surface)
The carbon steel is used in many areas due to its good mechanical properties; however, its low corrosion resistance presents a very important problem, for example, when carbon steel carabiners are used in the petroleum industry or navy, the possibility of an accident is higher due to carabiner failure. This phenomenon could occur as a consequence of the corrosion process which negatively affects mechanical properties. This paper study the possibility to improve its corrosion resistance by depositing on its surface a phosphate layer and a paint layer, and also aims to analyze the immersion behavior in saltwater of carbon steel, phosphate carbon steel, and phosphate and painted carbon steel. According to this study, by coating the carbon steel with a phosphate or paint layer, a higher polarization resistance is obtained in saltwater. Moreover, by electrochemical impedance spectroscopy (EIS), it was observed that the corrosion rate decreases with the increase of the immersion time. Meanwhile scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) revealed that the main compounds which formed on the sample’s surface were iron oxides or hydroxy-oxides, after immersion for a longer period. The overall results show that all types of deposited layers increase the corrosion resistance of C45 steel. View Full-Text
Keywords: seawater; corrosion resistance; paint; immersion behavior; phosphate layer; EIS; carbon steel; EDS; SEM seawater; corrosion resistance; paint; immersion behavior; phosphate layer; EIS; carbon steel; EDS; SEM
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MDPI and ACS Style

Bejinariu, C.; Burduhos-Nergis, D.-P.; Cimpoesu, N. Immersion Behavior of Carbon Steel, Phosphate Carbon Steel and Phosphate and Painted Carbon Steel in Saltwater. Materials 2021, 14, 188. https://doi.org/10.3390/ma14010188

AMA Style

Bejinariu C, Burduhos-Nergis D-P, Cimpoesu N. Immersion Behavior of Carbon Steel, Phosphate Carbon Steel and Phosphate and Painted Carbon Steel in Saltwater. Materials. 2021; 14(1):188. https://doi.org/10.3390/ma14010188

Chicago/Turabian Style

Bejinariu, Costica, Diana-Petronela Burduhos-Nergis, and Nicanor Cimpoesu. 2021. "Immersion Behavior of Carbon Steel, Phosphate Carbon Steel and Phosphate and Painted Carbon Steel in Saltwater" Materials 14, no. 1: 188. https://doi.org/10.3390/ma14010188

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