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 two cationic surfactants: dodecyl trimethyl ammonium bromide (DOTAB), cetyl trimethyl ammonium bromide (CTAB), a nonionic surfactant: Triton X-100, and two anionic surfactants: cetyl trimethyl ammonium chloride (CTAC) and 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 efficiency among cationic surfactants was related to DOTAB with an efficiency of 84.1%. Also, among anionic surfactants, SDS showed the highest efficiency, 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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