Synergism and antagonism in mild steel corrosion inhibition by sodium dodecylbenzenesulphonate and hexamethylenetetramine |
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Authors: | Mirghasem Hosseini Mohammed R Arshadi |
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Affiliation: | a Department of Chemistry, Sharif University of Technology, P.O. Box 11365-9516, Tehran, Iran b Ghent University, Analytical Chemistry Department, Krijgslaan 281-S12, B-9000 Gent, Belgium |
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Abstract: | The inhibition effects of sodium dodecylbenzenesulphonate (SDBS) and hexamethylenetetramine (HA) on the corrosion of mild steel in sulphuric acid solution have been studied using weight loss, electrochemical impedance and Tafel polarisation measurements. For HA, a monotonous increase in inhibition efficiency is observed as a function of concentration. For SDBS, however, an optimum in the inhibition efficiency is observed for a concentration close to 250 ppm, which is ascribed to the formation of hemi-micellar aggregates that provoke inhibitor desorption from the metal/solution interface at higher concentrations. Upon mixing HA and SDBS, concentration regions showing synergistic and antagonistic inhibition behaviour are identified, and it is concluded that electrostatic interactions between adsorbate ions are likely responsible for both phenomena. Langmuir and Frumkin isotherms were tested for relevance in describing the adsorption behaviour of both HA and SDBS. |
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Keywords: | Inhibitors Sodium dodecylbenzenesulphonate Hexamethylenetetramine A Mild steel C Acid corrosion Synergism Antagonism |
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