Abstract
<p>The influence of tetraethanol-b-octadecenyl succinylamide (TOSA) on the corrosion of steel in H<sub>2</sub>S0<sub>4 </sub>and HC1 solutions of divers concentrations has been studied using gravimetrical, electrochemical and polarization corrosion test methods. It has been observed that the TOSA behaves as an inhibitor of molecular active cathodic type and has inhibition effect at the beginning stage of corrosion in both acids, but more effectively in H<sub>2</sub>S0<sub>4</sub>. It is shown that the inhibition effect of the TOSA increases with temperature increasing from 91 % at 20 °C to 100 % at 80 °C in 0.5 N H<sub>2</sub>S0<sub>4</sub> solution and decreases with temperature increasing for higher concentrations of acid solutions. From obtained electrocapillary curves it is evidenced that the TOSA is a primarily additive of molecular type (insignificant shift of the maximum to the positive side on the curves). Moreover, it is surface active compound those superficial strength substantially decreases in H<sub>2</sub>S0<sub>4</sub> (30 dyn/cm) and HCl (34.9 dyn/cm) solutions. It has been shown that the TOSA has a high protection effect and high formation rate of adsorption layer on the metal surface in H<sub>2</sub>S0<sub>4</sub> (y = 96.4 % and t = 8.0 min) and HC1 (y = 91.5 % and t = 4.0 min).</p>
Highlights
The metal corrosion problem is getting the most urgent actuality due to the constant extending of industrial applications of metal articles and equipment in marine petrol mining, especially in the Caspian marine shelf.It is known that the use of functional organic inhibitors is a very effective method for anticorrosive protection of metal surfaces contacting with corrosive acid solutions
It was shown that some N-containing organic compounds such as pyridine and its derivatives [5], 4-phenyl thiosemicarbazide [6], alkylene di(tri or tetra)amines [7], aromatic and heterocyclic amines [8], pyrimidine derivatives [9], izomers of aminobenzoic acid [10], and others [11,12,13,14,15] could be used as metal corrosion inhibitors in acid solutions
The tetraethanol-P-octadecenyl succinylamide (TOSA) inhibitor efficiency was determined by study of the influence of following external factors on the surface properties of steel in acid solutions: (1) temperature, (2) concentration of corrosion solution, (3) concentration of inhibitor, and (4) type of corrosion solution, i.e., anionic composition of acid solution
Summary
It is known that the use of functional organic inhibitors is a very effective method for anticorrosive protection of metal surfaces contacting with corrosive acid solutions. The inhibitor properties of organic nitrogen-containing compounds in the solution of divers mineral acids were studied [1,2,3,4]. It was shown that some N-containing organic compounds such as pyridine and its derivatives [5], 4-phenyl thiosemicarbazide [6], alkylene di(tri or tetra)amines [7], aromatic and heterocyclic amines [8], pyrimidine derivatives [9], izomers of aminobenzoic acid [10], and others [11,12,13,14,15] could be used as metal corrosion inhibitors in acid solutions.
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