Influence of soil conditions on corrosion behavior of buried coated and uncoated carbon steels
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This paper presents an experimental investigation on influence of soil conditions on initial corrosion behavior of buried uncoated and coated steels at room temperature. Moisture contents and sodium chloride were varied in soil. The techniques used are electrochemical measurements i.e. open circuit potential, electrochemical impedance spectroscopy, and potentiodynamic polarization. The experimental results show that corrosion rate increases up to critical moisture content of 60 wt.% for each soil sample containing 0-10 wt.% sodium chloride. Maximum corrosion rate observed for carbon steel is 1.03 mm/yr for coupled action of 60 wt.% moisture and 5 wt.% sodium chloride. Corrosion rates of zinc-electroplated, and copper-electroplated samples are 0.45 and 0.057 mm/yr, respectively, under the same testing condition.Keywords:
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Abstract The corrosion behavior of carbon steel in weakly acidic NaCl solutions which were aerated or deaerated by H 2 or CO 2 has been studied in the temperature range 298 K ≥ T ≥ 343 K depending on the rotation frequency of RDE and the exposure time using conventional corrosion test methods and electrochemical impedance spectroscopy (EIS). Based on different theoretical transfer functions, the EIS data were analyzed with nonlinear fit procedures. It is shown that this method can be succesfully applied for an efficient and rapid screening of about 150 organic inhibitors for oil and gas production.
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Crevice corrosion
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The inhibitive action of FFFD-27SH inhibitor toward carbon steel corrosion in 3.5%NaCl solution was investigated using potentiodynamic polarization and electrochemical impedance spectroscopy(EIS). The results indicate that the addition of FFFD-27SH, which acts as an anodic type inhibitor, can effectively decrease the corrosion current densities of the carbon steel and increase the corrosion potential. EIS measurement results indicate that both of the charge transfer resistance and impedance increase greatly with the addition of FFFD-27SH and the double electric layer capacitance decreases significantly. The inhibition efficiency increases with the increase in inhibitor concentration, but changes little when its concentration is over 3%.
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Five new synthesized non ionic surfactants (I–V) were synthesized and characterized using FTIR and NMR spectroscopic methods. Performance of the synthesized compounds as corrosion inhibitors for X- 65 type carbon steel in oil wells formation water was investigated by various techniques such as weight loss, potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). It was found that the percentage inhibition efficiency (η%) increases by increasing the inhibitor concentration until the critical micelle concentration (CMC) is reached. Also, the results showed enhancement in inhibition efficiencies with increasing both molecular size of the surfactant and the degree of ethoxylation. Potentiodynamic polarization curves indicated that the inhibitors under investigation act as mixed type. The data obtained from electrochemical impedance spectroscopy (EIS) were analyzed to model the corrosion inhibition process through equivalent circuit. Finally, the nature of the protective film formed on carbon steel surface was analyzed by SEM and EDX techniques.
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Protection of Carbon Steel Rebars by Epoxy Coating with Smart Environmentally Friendly Microcapsules
The protection of mild steel by modified epoxy coating containing colophony microencapsulated corrosion inhibitors was investigated in this study. The corrosion behavior of these epoxy coatings containing colophony microcapsules was studied by electrochemical analysis using cyclic potentiodynamic polarization and electrochemical impedance spectroscopy. The microcapsule coating showed decreased corrosion current densities of 2.75 × 10−8 and 3.21 × 10−8 A/cm2 along with corrosion potential values of 0.349 and 0.392 VSCE for simulated concrete pore solution and deionized water with 3.5 wt.% NaCl, respectively, indicating improved corrosion protection in both alkaline and neutral pH. Electrochemical impedance spectroscopy analysis also showed charge transfer resistance values over one order of magnitude higher than the control sample, corroborating the electrochemical corrosion potential and current density testing results. Overall, the use of colophony microcapsules showed improved corrosion protection in simulated concrete pore solution and DI water solutions containing chloride ions.
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ABSTRACT To extend the useful life of power distribution and transmission lines metal artifacts, a hydrotalcite like nanomaterial has been studied because of its function as a nanocontainer for corrosion inhibition. The layered double hydroxides (LDH) are called hydrotalcite like material, wich are anion exchangers. Structurally, they consist of metal hydroxides with mixed positive charges separated by anionic and water molecules. Upon aggressive exposures, they can exchange ions with the environment, releasing a corrosion inhibition agent. In this research, three materials, (carbon steel 1010, carbon steel 1010 with epoxy resin and carbon steel 1010 with epoxy resin and the addition of 5% of LDH Zn-Al- NO2-) was analyzed by electrochemical impedance spectroscopy (EIS). The LDH was characterized by X-ray diffraction (XRD) and with Fourier transform infrared spectroscopy (FTIR). The results obtained evidenced the application of Zn-Al- NO2- in the elements of the power distribution and transmisson lines, since they did confered greater corrosion resistance to exposure and possible penetration of aggressive ions in the epoxy matrix (coating).
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The corrosion inhibition for carbon steel in circulating cooling water by modified lignosulphonate has been investigated using electrochemical impedance spectroscopy technique. Results show that the inhibition efficiency of modified lignosulphonate GCL2 is a great improvement on that of lignosulphonate. The maximum inhibition efficiency of GCL2 reaches 99.21% at forming adsorption film on the metal surface for the electrochemical impedance spectroscopy in GCL2 solution shows more than one time-constant. Moreover, results also indicate that it is more efficient in stirring solution than in still solution for GCL2 because the constant of adsorption in stirring solution is much larger than that in still solution. The adsorption of inhibitor GCL2 follows Langmuir's adsorption isotherm.
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