Abstract
The impact of cupral compound on steel in presence of deaerated 0.25 M H2SO4 and 0.5M HClacidic solutions at 298.15K was examined by employing electrochemical measurements. It has been observed that the corrosion efficiency increased by increasing of cupral concentration of the corrosion inhibitor and this enhanced the inhibitory action as mixed type inhibitor. Several different adsorption models were examined which indicate the adsorption of cupral compound as inhibitor on the carbon steel electrode surface follows the Langmuir isotherm equation. The thermodynamic factors governing adsorption, as well as the parameters of kinetics corrosion have been estimated. The role of nanosilica has been observed to reduce the values of current density of corrosion process and this was confirmed by study the surface morphology of electrode via SEM-EDX and AFM techniques by formation a protective layer on carbon steel electrode.
Highlights
Iron's alloys are amongst the most important materials in the world because of the good characteristics and varied applications in which they are used (Alaoui, M. et al, 2014)
The results demonstrate that the adsorption of inhibitor is enhanced: in first stage physical adsorption is observed and chemical adsorption occurs sequentially
Cupral was studied as a corrosion inhibitor for (X65-steel) carbon steel in deaerated 0.25 M H2SO4 and 0.5M HCl acidic solutions
Summary
Iron's alloys are amongst the most important materials in the world because of the good characteristics and varied applications in which they are used (Alaoui, M. et al, 2014). Carbon steel is used on a large scale as a building material for the pipe work in the gas and oil manufacture, for instance the tubular bottom of the well, the flow lines, and pipelines transfer (Okafor et al, 2010). It is an integral part of the equipment used in the oil and other manufacturing industries (Alaoui et al, 2014) and is important because of its easy availability and low cost, making it possible to use it in the fabrication of complex and large-scale installations. The surface of X65-Steel will be inspected by atomic force microscopy (AFM), scanning electron microscopy (SEM) as well as Energy dispersive X-rays analysis (EDX) to evaluate the composition of protective layer
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