Abstract
Some commercial non-ionic surfactants polysorbate, namely, polysorbate 80, polysorbate 40 and polysorbate 20, were tested as inhibitors for corrosion of C-steel in 2.0M HCl solution using weight loss, potentiodynamic polarization and electrochemical impedance spectroscopy techniques. It was found that all the three used compounds act as inhibitors for acid corrosion of C-steel. The inhibition efficiencies obtained by the three techniques were almost the same, and increase with increasing the hydrocarbon chain length and the surfactant concentration. The polarization studies show that these compounds act as mixed inhibitors. The inhibition action of these surfactants can be explained by their ability to adsorb on the metal surface making a barrier to mass and charge transfer. It was found that the adsorption of these surfactants follows Langmuir adsorption isotherm. The negative values of adsorption free energy indicating that the adsorption process is spontaneous and increases, for different surfactants, in the same direction as inhibition efficiency.
Highlights
The use of inhibitors is one of the most practical methods for metals protection against corrosion in acidic media 1
Many studies were done on the corrosion and inhibition of carbon steel in acidic media 9-13.The efficiency of the surfactants is higher than the other organic inhibitors because of surfactant compounds exist at the interface between corrosive media and steel surface by more concentration
Adsorption depends on the nature and charge of the metal and on the chemical structure of the inhibitor .The objective of this study is to investigate the effect of some polysorbate compounds on the corrosion of carbon steel in hydrochloric acid solution
Summary
The use of inhibitors is one of the most practical methods for metals protection against corrosion in acidic media 1. It has been found that most of the organic inhibitors act by adsorption on the metal surface 7 This phenomenon is influenced by the nature and surface charge of metal, the type of aggressive electrolyte and the chemical structure of inhibitors 8. Many studies were done on the corrosion and inhibition of carbon steel in acidic media 9-13.The efficiency of the surfactants is higher than the other organic inhibitors because of surfactant compounds exist at the interface between corrosive media and steel surface by more concentration. Adsorption depends on the nature and charge of the metal and on the chemical structure of the inhibitor .The objective of this study is to investigate the effect of some polysorbate compounds on the corrosion of carbon steel in hydrochloric acid solution. The inhibition efficiency of these compounds was determined by using weight loss, potentiodynamic polarization, and electrochemical impedance spectroscopy (EIS) techniques
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