Pitting Corrosion of Iron in Weakly Alkaline Chloride Solutions

Makar, G. L.; Tromans, Desmond

doi:10.5006/1.3293637

Cited by 17 publications

(14 citation statements)

References 3 publications

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“…[54] Part of this action could be due to the elevation of the solution pH, which decreases the potential necessary for an iron oxide formation in aerated solutions. [55,56] To clarify the performance behavior of both inhibitors, polarization curves of steel were obtained in 0.01 mol/L sodium chloride in the absence of PILs in neutral solution (pH 6) and in pH 9 solution, since the addition of PILs increases the solution's pH. So, we investigated if the performance of PILs was just strictly related with pH increase.…”

Section: Ocp Measurementsmentioning

confidence: 99%

An amino‐based protic ionic liquid as a corrosion inhibitor of mild steel in aqueous chloride solutions

Schmitzhaus

Ortega-Vega

Schroeder

et al. 2020

Materials & Corrosion

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Protic ionic liquids (PILs) have shown to be promising substances as corrosion inhibitors (CIs). In line with this, the aim of this study is to study the performance and propose the corrosion inhibition mechanism of N-methyl-2hydroxyethylamine (M-2HEAOL) and bis-2-hidroxyethylamine (B-HEAOL) oleate, for mild steel, in a neutral chloride solution. Electrochemical characterization was conducted under static and hydrodynamic conditions, and it was revealed that M-2HEAOL and B-HEAOL worked as mixed-type CIs with more interference on the anodic reaction. Inhibition efficiency depended on the concentration reaching 97% of inhibition efficiency in 5 mmol/L concentration. Scanning electron microscopy, optical interferometry, Raman spectroscopy, and Fourier-transform infrared spectroscopy are used to elicit the chemical composition of the surface film and corrosion morphology of steel in the presence of CIs, the adsorption processes of which involved physical and chemical adsorption between metal and different parts of ionic liquids. The results allowed the proposition of a corrosion inhibition mechanism.

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Section: Ocp Measurementsmentioning

confidence: 99%

An amino‐based protic ionic liquid as a corrosion inhibitor of mild steel in aqueous chloride solutions

Schmitzhaus

Ortega-Vega

Schroeder

et al. 2020

Materials & Corrosion

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“…The formation of species such as Fe 3 O 4 in static tap water as a result of solubility of Fe 2+ to Fe 3+ and FeCl 3 in aerated chlorine-rich environment is generally expected [14]. However, the solubility of Fe 2+ and Fe 3+ and hence the final corrosion products are reported to be a function of both potential and pH [31].…”

Section: Characterisation Of Corrosion Productsmentioning

confidence: 99%

Experimental Investigation on Corrosion of Cast Iron Pipes

Mohebbi

2011

International Journal of Corrosion

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It is well known that corrosion is the predominant mechanism for the deterioration of cast iron pipes, leading to the reduction of pipe capacity and ultimate collapse of the pipes. In order to assess the remaining service life of corroded cast iron pipes, it is imperative to understand the mechanisms of corrosion over a long term and to develop models for pipe deterioration. Although many studies have been carried out to determine the corrosion behavior of cast iron, little research has been undertaken to understand how cast iron pipes behave over a longer time scale than hours, days, or weeks. The present paper intends to fill the gap regarding the long-term corrosion behaviour of cast iron pipes in the absence of historical data. In this paper, a comprehensive experimental program is presented in which the corrosion behaviour of three exservice pipes was thoroughly examined in three simulated service environments. It has been found in the paper that localised corrosion is the primary form of corrosion of cast iron water pipes. It has also been found that the microstructure of cast irons is a key factor that affects the corrosion behaviour of cast iron pipes. The paper concludes that long-term tests on corrosion behaviour of cast iron pipes can help develop models for corrosion-induced deterioration of the pipes for use in predicting the remaining service life of the pipes.

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“…There were no corrosion products deposited in the pitting. The SRB pitting morphology possessed the characteristics of local acidification (Alvarez and Galvele, 2010; Jayalakshmi and Muralidharan, 1996; Makar and Tromans, 1996; Zhao et al , 2016). The thickness of the biofilm was approximately 8 μ m. In the biofilm, there were quantities of living SRB cells.…”

Section: Resultsmentioning

confidence: 99%

“…After the immersion test in SRB solution, a high quantity of deep pits was observed on the specimens without Cu (Figures 1 and 2). In addition, also, the cross-section morphology result shows that the pitting was empty (Figure 5), which was considered as a characteristic of local acidification (Alvarez and Galvele, 2010; Jayalakshmi and Muralidharan, 1996; Makar and Tromans, 1996; Zhao et al , 2016). The acidification pitting corrosion may relate to the MIC mechanism and ion selectivity of biofilm.…”

Section: Discussionmentioning

confidence: 99%

Effect of copper addition in carbon steel on biocorrosion by sulfate-reducing bacteria in solution

Xia

et al. 2021

ACMM

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Purpose This paper aims to investigate the anti-biocorrosion performance and mechanism of the Cu-bearing carbon steel in the environment containing sulfate-reducing bacterial (SRB). Design/methodology/approach The biocorrosion behavior of specimens with Cu concentration of 0 Wt.%, 0.1 Wt.%, 0.3 Wt.% and 0.6 Wt.% were investigated by immersion test in SRB solution. By examining the prepared cross-section of the biofilm using focused ion beam microscopy, SRB distribution, bacterial morphology, biofilm structure and composition were determined. The ion selectivity of the biofilm was also obtained by membrane potential measurement. Moreover, the anti-biocorrosion performance of the Cu-bearing carbon steel pipeline was tested in a shale gas field in Chongqing, China. Findings Both the results of the laboratory test and shale gas field test indicate that Cu-bearing carbon steel possesses obvious resistance to microbiologically influenced corrosion (MIC). The SRB, corrosion rate and pitting depth decreased dramatically with Cu concentration in the substrate. The local acidification caused by hydrolyze of ferric ion coming from SRB metabolism and furtherly aggravated by anion selectivity biofilm promoted the pitting corrosion. Anti-biocorrosion of Cu-bearing carbon steel was attributed to the accumulation of Cu compounds in the biofilm and the weaker anion selectivity of the biofilm. This research results provide an approach to the development of economical antibacterial metallic material. Originality/value MIC occurs extensively and has become one of the most frequent reasons for corrosion-induced failure in the oil and gas industry. In this study, Cu-bearing carbon steel was obtained by Cu addition in carbon steel and possessed excellent anti-biocorrosion property both in the laboratory and shale gas field. This study provides an approach to the development of an economical antibacterial carbon steel pipeline to resist MIC.

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Pitting Corrosion of Iron in Weakly Alkaline Chloride Solutions

Cited by 17 publications

References 3 publications

An amino‐based protic ionic liquid as a corrosion inhibitor of mild steel in aqueous chloride solutions

An amino‐based protic ionic liquid as a corrosion inhibitor of mild steel in aqueous chloride solutions

Experimental Investigation on Corrosion of Cast Iron Pipes

Effect of copper addition in carbon steel on biocorrosion by sulfate-reducing bacteria in solution

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