Early corrosion of mild steel in seawater

Melchers, Robert E.; Jeffrey, R.

doi:10.1016/j.corsci.2004.08.006

Cited by 141 publications

(64 citation statements)

References 11 publications

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“…5(b)) clearly shows that the corrosion system has only one time constant, which demonstrates the feasibility and effectiveness of the EIS fitting. The EIS results and the corresponding equivalent circuit indicate that, during the 1-2 h immersion period, the corrosion process of Q345B was controlled by activation rather than by oxygen diffusion, consistent with the results of Melchers and Jeffrey [46]. Fig.…”

Section: Eis Analysessupporting

confidence: 76%

“…Melchers and Jeffrey [46] proposed that the corrosion of carbon steel immersed in seawater was controlled by activation when the immersion time was less than 5 d. Therefore, for Q345B immersed in 3.5wt% NaCl for only a few hours, the corrosion process can be reasonably assumed to be activation controlled, as confirmed by the EIS spectrum and the corresponding equivalent circuit (Fig. 5).…”

Section: Efm Testsmentioning

confidence: 68%

“…The anodic polarization is activation controlled, whereas a limiting diffusion plateau clearly exists in the cathodic region. As the OCP drifts toward the negative direction, the natural corrosion process will tend to become oxygen-diffusion controlled, as in the phenomenon reported by Melchers and Jeffrey [46]. For the anodic process controlled by activation, the corrosion kinetic parameters can be obtained by fitting the Tafel curve in the strong polarization region, i.e., in the region from +70 to +150 mV vs. E corr , using linear fitting Eq.…”

Section: Eis Analysesmentioning

confidence: 99%

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A comparative study on corrosion kinetic parameter estimation methods for the early stage corrosion of Q345B steel in 3.5wt% NaCl solution

Cai

Wen

Jin

2017

Int J Miner Metall Mater

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Corrosion kinetic parameters play an important role in researchers' ability to understand and predict corrosion behavior. The corrosion kinetic parameters of structural steel Q345B specimens immersed in 3.5wt% NaCl solution for 1-2 h were determined using linear polarization resistance (LPR), Tafel-curve multiparameter fitting, electrochemical impedance spectroscopy (EIS), and electrochemical frequency modulation (EFM) methods. The advantages and disadvantages of each method were investigated and discussed through comparative investigation. Meanwhile, the average corrosion rate was examined using traditional coupon tests. The results showed that the corrosion current density values estimated by EFM at a base frequency of 0.001 Hz and those obtained by Tafel-curve four-parameter fitting (TC4) are similar and consistent with the results of coupon tests. Because of their slight perturbation of the corrosion system, EIS and EFM/TC4 in collaborative application are the recommended techniques for determining the kinetics and the corresponding parameters for the homogeneous corrosion of the naked metal. In our study of the electrochemical kinetics, we obtained much more abundant and accurate electrochemical kinetic parameters through the combined use of different electrochemical methods.

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Section: Eis Analysessupporting

confidence: 76%

Section: Efm Testsmentioning

confidence: 68%

Section: Eis Analysesmentioning

confidence: 99%

See 1 more Smart Citation

A comparative study on corrosion kinetic parameter estimation methods for the early stage corrosion of Q345B steel in 3.5wt% NaCl solution

Cai

Wen

Jin

2017

Int J Miner Metall Mater

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“…Corrosion on metallic structures can considerably reduce the cross-section area of the associated components and correspondingly lower the capability of carrying loads. This will result in significant impacts on the reliability and safety of the structures which might lead to catastrophic consequence occasionally [3,4].…”

Section: Introductionmentioning

confidence: 99%

Pitted Corrosion Detection of Thermal Sprayed Metallic Coatings Using Fiber Bragg Grating Sensors

et al. 2017

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Metallic coatings using thermal spraying techniques are widely applied to structural steels to protect infrastructure against corrosion and improve durability of the associated structures for longer service life. The thermal sprayed metallic coatings consisting of various metals, although have higher corrosion resistance, will still corrode in a long run and may also subject to corrosion induced damages such as cracks. Corrosion and the induced damages on the metallic coatings will reduce the effectiveness of the coatings for protection of the structures. Timely repair on these damaged metallic coatings will significantly improve the reliability of protected structures again deterioration. In this paper, an inline detection system for corrosion and crack detection was developed using fiber Bragg (FBG) grating sensors. Experimental results from laboratory accelerated corrosion tests showed that the developed sensing system can quantitatively detect corrosion rate of the coating, corrosion propagations, and cracks initialized in the metallic coating in real time. The developed system can be used for real-time corrosion detection of coated metal structures in field.

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“…The corrosion of structural steel is an electrochemical process that requires the simultaneous presence of moisture and oxygen. Protection using coatings or cathodic protection systems or both can be effective if properly maintained [5].…”

Section: Introductionmentioning

confidence: 99%

LawsonialnermisExtract Enhances Performance of Corrosion Protection of Coated Mild Steel in Seawater

et al. 2016

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Abstract. The investigation of coating incorporated with various percentages of henna has been conducted by means of weight loss, potentiodynamic polarization and electrochemical impedance spectroscopy method. Mild steel has been studied at ambient temperature and 50°C in order to examine the effect of temperature. The potentiodynamic polarization measurements indicate that henna extract acts as a mixed inhibitor while the corrosion rate (CR) value decreases as the current density (I corr ) decreases in the presence of 10% henna extract for both temperatures. Surface and protective film analysis have been carried out using Fourier transform infrared (FTIR) and scanning electron microscopy (SEM).The inhibition activity is mainly correlated with the major active functional groups of lawsone. The main components can be found in lawsone structures are phenols O-H, carboxylic acid C=O and alkenes C=C. The morphology of the uninhibited sample showsa rough surface of mild steel as a result of corrosion process and severe damage can be seen. In the presence of henna, a smooth surface of mild steel anda uniform deposition of henna were observed.

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Early corrosion of mild steel in seawater

Cited by 141 publications

References 11 publications

A comparative study on corrosion kinetic parameter estimation methods for the early stage corrosion of Q345B steel in 3.5wt% NaCl solution

A comparative study on corrosion kinetic parameter estimation methods for the early stage corrosion of Q345B steel in 3.5wt% NaCl solution

Pitted Corrosion Detection of Thermal Sprayed Metallic Coatings Using Fiber Bragg Grating Sensors

LawsonialnermisExtract Enhances Performance of Corrosion Protection of Coated Mild Steel in Seawater

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