Exploring the corrosion performances of carbon steel in flowing natural sea water and synthetic sea waters

Zhou, Qipiao; Liu, Liang; Zhang, Qiliang; Song, Shide; Huang, Yi

doi:10.1080/1478422x.2020.1765476

Cited by 27 publications

(14 citation statements)

References 32 publications

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“…Carbon steels are extensively used in ocean engineering applications due to their low cost and high mechanical strength [1][2][3] . Because of the low contents of Ni and Cr elements, the passive film cannot form on the surface of carbon steel, leading to the steel degradation under active corrosion in seawater 4,5 .…”

Section: Introductionmentioning

confidence: 99%

Flow accelerated corrosion and erosion−corrosion behavior of marine carbon steel in natural seawater

Zhang

Zhou

et al. 2021

npj Mater Degrad

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In this work, flow accelerated corrosion (FAC) and erosion−corrosion of marine carbon steel in natural seawater were electrochemically studied using a submerged impingement jet system. Results show that the formation of a relatively compact rust layer in flowing natural seawater would lead to the FAC pattern change from ‘flow marks’ to pits. The increase of the flow velocity was found to have a negligible influence on the FAC rate at velocities of 5−8 m s−1. The synergy of mechanical erosion and electrochemical corrosion is the main contributor to the total steel loss under erosion−corrosion. The increase of the sand impact energy could induce the pitting damage and accelerate the steel degradation. The accumulation of the rust inside the pits could facilitate the longitudinal growth of the pits, however, the accumulated rusts retard the erosion of the pit bottom. The erosion and corrosion could work together to cause the steel peeling at the pit boundary. The steel degradation would gradually change from corrosion-dominated to erosion-dominated along with the impact energy increasing.

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Section: Introductionmentioning

confidence: 99%

Flow accelerated corrosion and erosion−corrosion behavior of marine carbon steel in natural seawater

Zhang

Zhou

et al. 2021

npj Mater Degrad

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“…These features are assigned in Fig. S2 (B) for 4FPDC as follows: the Ar-H group is located at H (5), H (7), H (9), H (10) which is assigned at peaks with the range δ (ppm), 7.14-7.47; the Ar-NH group is located at H (14) with a peak at δ (ppm), 8.11; the -NH-NH-group is located at H (18), H (20) with peaks at range δ (ppm), 9.38-9.76; the NH 2 group is located at H (23), H (24) with a peak at δ (ppm), 3.35.…”

Section: Characterization Of Inhibitormentioning

confidence: 99%

“…The extracted parameters are determined and recoded in Table 6 by using Eqs. (10)(11)(12)(13)(14)(15) as follows [73,74]:…”

Section: Neutral Inhibitorsmentioning

confidence: 99%

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Corrosion Inhibition Potential of Dithiohydrazodicarbonamide Derivatives for Mild Steel in Acid Media: Synthesis, Experimental, DFT, and Monte Carlo Studies

AlFalah

Kandemi̇rlı

2021

Arab J Sci Eng

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In the present work, new compounds, namely 2-fluoro phenyl-2,5-dithiohydrazodicarbonamide (2FPDC) and 4-fluoro phenyl-2,5-dithiohydrazodicarbonamide (4FPDC), were successfully synthesized and examined as corrosion inhibitors for mild steel in 1 M HCl. The molecular structures were characterized by Fourier transform infrared spectroscopy (FT-IR) and 1 H, 13 C nuclear magnetic resonance (NMR). A scanning electron microscope (SEM), energy-dispersive X-ray spectroscopy (EDX), and atomic force microscope (AFM) were conducted to identify the surface morphology of mild steel in the absence and existence of a corrosion inhibitor. Several electrochemical techniques have been conducted to evaluate inhibitor efficiency. The influence of immersion time on the efficiency of inhibitors was also investigated. The electrochemical results showed that both compounds appeared to be mixed type. However, 4FPDC is slightly more efficient than 2FPDC (97.3% compared with 96.5% at 1 × 10 −2 M and an immersion time of 5 h). The resistance polarization for inhibitors was found to obey an order of 4FPDC > 2FPDC. The Langmuir isotherm system revealed the best match, and the type of adsorption was physisorption and chemisorption in both compounds. SEM and EDX results have confirmed the presence of particles of inhibitor on the metal surface. A smooth surface was observed in the presence of inhibitors approved by AFM. Quantum chemical results showed that the adsorption of molecules of inhibitor takes place predominantly through protonated structures, and strongly agreed with experimental results. The results reveal that excellent inhibition efficiency was attained even in aggressive conditions, and they can be viewed as novel corrosion inhibitors for mild steel with excellent protection. Keywords Materials and Experimental Methods MaterialsA mild steel rod was purchased from a local market with a chemical composition as follows: (Wt.%): 0.18 C,

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“…Carbon steels are widely used to construct marine structures and equipment, such as offshore platforms, subsea pipelines, ships and underwater vehicles [1][2][3]. The marine carbon steel would suffer serious degradation in corrosive sea water without proper protection [4]. Cathodic protection (CP) is one of the most effective and useful methods to protect the marine steel from corrosion [5,6].…”

Section: Introductionmentioning

confidence: 99%

Sand impingements on cathodic protection of marine carbon steel in natural sea water

Gao

Zou

Zhao

et al. 2022

Corrosion Engineering, Science and Technology

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In this work, the influence of sand impingements on cathodic protection (CP) of marine carbon steel in natural sea water was studied in comparison with the CP performances in static and flowing sea water without sand particles. Results show that the propagation of local active anodic dissolution at the steel inclusions could be totally inhibited by providing sufficient cathodic current in the sea water free of sand particles. However, the local 'CP shielding', potential fluctuation and sand impingements would enhance the anodic dissolution at inclusions, thus leading to the occurrence of erosion-corrosion under CP. The negative shift of the CP potential could not retard the propagation of erosion-corrosion pits under sand impingements. The synergy of erosion and corrosion might result in long-term failure of local CP.

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Exploring the corrosion performances of carbon steel in flowing natural sea water and synthetic sea waters

Cited by 27 publications

References 32 publications

Flow accelerated corrosion and erosion−corrosion behavior of marine carbon steel in natural seawater

Flow accelerated corrosion and erosion−corrosion behavior of marine carbon steel in natural seawater

Corrosion Inhibition Potential of Dithiohydrazodicarbonamide Derivatives for Mild Steel in Acid Media: Synthesis, Experimental, DFT, and Monte Carlo Studies

Sand impingements on cathodic protection of marine carbon steel in natural sea water

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