Electrochemical evaluation of cephalothin as corrosion inhibitor for API 5L X52 steel immersed in an acid medium

The corrosion inhibition efficiency, η, of sodium (6R,7R)-3-[(acetoxy)methyl]-8-oxo-7-[(2-thienylacetyl)amino]-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid, cephalothin, was evaluated in the system API 5L X52/1M HCl, using electrochemical impedance spectroscopy and SEM analysis. The results...

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Bibliographic Details
Published in:Arabian journal of chemistry 2019-12, Vol.12 (8), p.3244-3253
Main Authors: Aldana-González, Jorge, Espinoza-Vázquez, Araceli, Romero-Romo, Mario, Uruchurtu-Chavarin, Jorge, Palomar-Pardavé, Manuel
Format: Article
Language:English
Subjects:
Adsorption
Corrosion inhibitor
Electrochemical techniques
Organic compounds
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Summary:The corrosion inhibition efficiency, η, of sodium (6R,7R)-3-[(acetoxy)methyl]-8-oxo-7-[(2-thienylacetyl)amino]-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid, cephalothin, was evaluated in the system API 5L X52/1M HCl, using electrochemical impedance spectroscopy and SEM analysis. The results showed that the inhibition mechanism involves blockage of the steel surface by the inhibitor molecules through a Langmuir-type adsorption process. The studies to determine the durability where the inhibitor remained effective showed that, at stagnant conditions, the η was maintained over 92% for up to 600 immersion hours at 50ppm, reaching the best corrosion efficiency when temperature was 25°C.
ISSN:1878-5352
1878-5379
DOI:10.1016/j.arabjc.2015.08.033