Abstract. The inhibition of carbon steel corrosion in neutral sodium chloride solution by N,N'-Dimethylaminoethanol (DMEA), at different temperatures, was investigated using weight loss, potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques. The results obtained confirm that DMEA is a good organic corrosion inhibitor for carbon steel in 0.5M of NaCl (concentration encountered in the Mediterranean seawater), over the whole range of temperatures studied. The inhibition efficiency (IE%) increases with increasing DMEA concentration; it reaches highest value for a concentration around 0.125 mol.L -1 . Potentiodynamic polarization data show that, the compound studied in this research predominantly act as anodic-type inhibitor. The EIS study reveals that the addition of DMEA decreases the corrosion rate of carbon steel in neutral sodium chloride solution, due to the fact that the inhibitor molecules are strongly adsorbed on the active sites following Langmuir isotherm, thus leading to the formation of a stable protective film on the steel surface which is able to keep the metal/solution interface in a passive state. Furthermore, the values of the activation parameters, i.e. ΔHa and Ea obtained in this study indicate that the adsorption process of DMEA is endothermic and could be mainly attributed to chemisorption, respectively.
The inhibition of carbon steel corrosion in neutral sodium chloride solution by N,N'- Dimethylaminoethanol (DMEA), at different temperatures, was investigated using weight loss, potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques. The results obtained confirm that DMEA is a good organic corrosion inhibitor for carbon steel in 0.5M of NaCl (concentration encountered in the Mediterranean seawater), over the whole range of temperatures studied. The inhibition efficiency (IE%) increases with increasing DMEA concentration; it reaches highest value for a concentration around 0.125 mol.L-1. Potentiodynamic polarization data show that, the compound studied in this research predominantly act as anodic-type inhibitor. The EIS study reveals that the addition of DMEA decreases the corrosion rate of carbon steel in neutral sodium chloride solution, due to the fact that the inhibitor molecules are strongly adsorbed on the active sites following Langmuir isotherm, thus leading to the formation of a stable protective film on the steel surface which is able to keep the metal/solution interface in a passive state. Furthermore, the values of the activation parameters, i.e. ΔHa and Ea obtained in this study indicate that the adsorption process of DMEA is endothermic and could be mainly attributed to chemisorption, respectively.
Light-gauge steel-framed (LSF) walls are being adopted by the Algerian construction industry as a new alternative to the traditional infilled frames due to the advantages they provide. The strength-to-weight ratio of Cold Formed Section (CFS) leads to lighter structures and a decrease in the building cost. However, in the case of fire, the high shape factor combined with the loss of material properties of the unprotected, slender CFS can result in structural failure. Because of their conductivity, elevated temperatures have an effect on the thermal performance of panels, necessitating the use of appropriate insulation. The purpose of this paper is to perform a numerical analysis of the thermal behavior of LSF walls protected by plasterboard or magnesium oxide board, as well as cavity insulations. Numerical models are developed, using ANSYS software to simulate the thermal performance of LSF walls under ISO 834 fire. Thermal simulations are done to predict temperature profiles, maximum temperatures, and the estimated fire resistance level (FRL). This research has produced results to better evaluate the influence of different systems of protection and insulation used for the CFS under fire.
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