The inhibitory effect of different surfactants on the corrosion of A335 alloy steel in sodium hydroxide solution

Document Type : Original Article

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Department of Chemistry, Semnan University, Semnan, Iran

Abstract

In this study, the corrosion inhibition performance of five different surfactants, including three cationic surfactants: dodecyl trimethyl ammonium bromide (DOTAB), cetyl trimethyl ammonium bromide (CTAB), cetyl trimethyl ammonium chloride (CTAC) a nonionic surfactant: Triton X-100, and an anionic surfactants: sodium dodecyl sulfate (SDS), was investigated on A335 alloy steel in a 4M sodium hydroxide solution. To evaluate the corrosion behavior, electrochemical methods including Tafel polarization and electrochemical impedance spectroscopy were employed. The results showed that all surfactants reduced the corrosion rate of the steel sample, but the highest inhibition was related to DOTAB with an efficiency of 84.1% and SDS with an efficiency of 85.3%. FE-SEM images also confirmed the reduction of surface damage in the presence of these inhibitors. The results of this study indicate that the use of surfactants can be an effective and economical method to increase the corrosion resistance of A335 steel in alkaline environments.

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Applied Chemistry Today
Volume 20, Issue 75
September 2025
Pages 151-162

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